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1 PhysicsAndMathsTutor.com
2 physicsandmathstutor.com June An arithmetic series has first term a and common difference d. (a) Prove that the sum of the first n terms of the series is 1 2 n[2 a+ ( n 1) d]. (4) Sean repays a loan over a period of n months. His monthly repayments form an arithmetic sequence. He repays 149 in the first month, 147 in the second month, 145 in the third month, and so on. He makes his final repayment in the nth month, where n > 21. (b) Find the amount Sean repays in the 21st month. Over the n months, he repays a total of (c) Form an equation in n, and show that your equation may be written as (d) Solve the equation in part (c). n 2 150n = 0. (3) (3) (e) State, with a reason, which of the solutions to the equation in part (c) is not a sensible solution to the repayment problem. (1) 18 *N23491C01824*
3 physicsandmathstutor.com June 2005 Question 9 continued *N23491C01924* 19 Turn over
4 physicsandmathstutor.com January The sequence of positive numbers u 1, u 2, u 3,... is given by: u n +1 = (u n 3) 2, u 1 = 1. (a) Find u 2, u 3 and u 4. (b) Write down the value of u 20. (3) (1) Q2 (Total 4 marks) *N20233A0320* 3 Turn over
5 physicsandmathstutor.com January On Alice s 11th birthday she started to receive an annual allowance. The first annual allowance was 500 and on each following birthday the allowance was increased by 200. (a) Show that, immediately after her 12th birthday, the total of the allowances that Alice had received was (1) (b) Find the amount of Alice s annual allowance on her 18th birthday. (c) Find the total of the allowances that Alice had received up to and including her 18th birthday. (3) When the total of the allowances that Alice had received reached the allowance stopped. (d) Find how old Alice was when she received her last allowance. (7) 10 *N20233A01020*
6 physicsandmathstutor.com January 2006 Question 7 continued Q7 (Total 13 marks) *N20233A01120* 11 Turn over
7 physicsandmathstutor.com June A sequence a 1, a 2, a 3,... is defined by a 1 = 3, a n +1 = 3a n 5, n 1. (a) Find the value of a 2 and the value of a 3. (b) Calculate the value of 5 r= 1 a. r (3) 6 *N23557A0624*
8 physicsandmathstutor.com June An athlete prepares for a race by completing a practice run on each of 11 consecutive days. On each day after the first day, he runs further than he ran on the previous day. The lengths of his 11 practice runs form an arithmetic sequence with first term a km and common difference d km. He runs 9 km on the 11th day, and he runs a total of 77 km over the 11 day period. Find the value of a and the value of d. (7) 12 *N23557A01224*
9 physicsandmathstutor.com January Ann has some sticks that are all of the same length. She arranges them in squares and has made the following 3 rows of patterns: Row 1 Row 2 Row 3 She notices that 4 sticks are required to make the single square in the first row, 7 sticks to make 2 squares in the second row and in the third row she needs 10 sticks to make 3 squares. (a) Find an expression, in terms of n, for the number of sticks required to make a similar arrangement of n squares in the nth row. (3) Ann continues to make squares following the same pattern. She makes 4 squares in the 4th row and so on until she has completed 10 rows. (b) Find the total number of sticks Ann uses in making these 10 rows. (3) Ann started with 1750 sticks. Given that Ann continues the pattern to complete k rows but does not have sufficient sticks to complete the (k + 1)th row, (c) show that k satisfies (3k 100)(k + 35) < 0. (4) (d) Find the value of k. 14 *N23561A01420*
10 physicsandmathstutor.com January 2007 Question 9 continued Q9 (Total 12 marks) *N23561A01720* 17 Turn over
11 physicsandmathstutor.com June A girl saves money over a period of 200 weeks. She saves 5p in Week 1, 7p in Week 2, 9p in Week 3, and so on until Week 200. Her weekly savings form an arithmetic sequence. (a) Find the amount she saves in Week 200. (b) Calculate her total savings over the complete 200 week period. (3) (3) 6 *H26107A0624*
12 physicsandmathstutor.com June A sequence a a,,... is defined by 1, 2 a 3 where k is a positive integer. a 1 = k, a = 3 a 5, n 1, n+ 1 n + (a) Write down an expression for a 2 in terms of k. (1) a 3 (b) Show that = 9k (c) (i) Find r= 4 1 a r in terms of k. 4 (ii) Show that ar is divisible by 10. r= 1 (4) 14 *H26107A01424*
13 physicsandmathstutor.com January A sequence is given by: x 1 =1, x = x ( p+ x ), n+ 1 n n where p is a constant p. (a) Find x 2 in terms of p. 2 (b) Show that x = 1+ 3p+ 2p. 3 (1) Given that x 3 = 1, (c) find the value of p, (3) (d) write down the value of x *N25561A01024*
14 physicsandmathstutor.com January 2008 Question 7 continued Q7 (Total 8 marks) *N25561A01124* 11 Turn over
15 physicsandmathstutor.com January The first term of an arithmetic sequence is 30 and the common difference is 1.5 (a) Find the value of the 25th term. The rth term of the sequence is 0. (b) Find the value of r. The sum of the first n terms of the sequence is S n. (c) Find the largest positive value of S n. (3) 20 *N25561A02024*
16 physicsandmathstutor.com January 2008 Question 11 continued Q11 END (Total 7 marks) TOTAL FOR PAPER: 75 MARKS *N25561A02324* 23
17 physicsandmathstutor.com June A sequence x 1, x 2, x 3, is defined by x 1 = 1, x n + 1 = ax n 3, n > 1, where a is a constant. (a) Find an expression for x 2 in terms of a. (b) Show that x 3 = a 2 3a 3. (1) Given that x 3 = 7, (c) find the possible values of a. (3) 8 *H29992A0828*
18 physicsandmathstutor.com June Sue is training for a marathon. Her training includes a run every Saturday starting with a run of 5 km on the first Saturday. Each Saturday she increases the length of her run from the previous Saturday by 2 km. (a) Show that on the 4th Saturday of training she runs 11 km. (1) (b) Find an expression, in terms of n, for the length of her training run on the nth Saturday. (c) Show that the total distance she runs on Saturdays in n weeks of training is n(n + 4) km. (3) On the n th Saturday Sue runs 43 km. (d) Find the value of n. (e) Find the total distance, in km, Sue runs on Saturdays in n weeks of training. 12 *H29992A01228*
19 physicsandmathstutor.com June 2008 Question 7 continued *H29992A01328* 13 Turn over
20 physicsandmathstutor.com January The first term of an arithmetic series is a and the common difference is d. The 18th term of the series is 25 and the 21st term of the series is (a) Use this information to write down two equations for a and d. (b) Show that a = 17.5 and find the value of d. The sum of the first n terms of the series is (c) Show that n is given by n 2 15n= (4) (d) Hence find the value of n. (3) 16 *n30081a01628*
21 physicsandmathstutor.com January 2009 Question 9 continued Q9 (Total 11 marks) *n30081a01928* 19 Turn over
22 physicsandmathstutor.com June A 40-year building programme for new houses began in Oldtown in the year 1951 (Year 1) and finished in 1990 (Year 40). The numbers of houses built each year form an arithmetic sequence with first term a and common difference d. Given that 2400 new houses were built in 1960 and 600 new houses were built in 1990, find (a) the value of d, (b) the value of a, (3) (c) the total number of houses built in Oldtown over the 40-year period. (3) 8 *H34262A0828*
23 physicsandmathstutor.com June A sequence a 1, a 2, a 3,... is defined by a 1 = k, a n+1 = 2a n 7, n 1, where k is a constant. (a) Write down an expression for a 2 in terms of k. (b) Show that a 3 = 4k 21. Given that 4 a r = r= 1 43, (1) (c) find the value of k. (4) 12 *H34262A01228*
24 physicsandmathstutor.com January Jill gave money to a charity over a 20-year period, from Year 1 to Year 20 inclusive. She gave 150 in Year 1, 160 in Year 2, 170 in Year 3, and so on, so that the amounts of money she gave each year formed an arithmetic sequence. (a) Find the amount of money she gave in Year 10. (b) Calculate the total amount of money she gave over the 20-year period. (3) Kevin also gave money to the charity over the same 20-year period. He gave A in Year 1 and the amounts of money he gave each year increased, forming an arithmetic sequence with common difference 30. The total amount of money that Kevin gave over the 20-year period was twice the total amount of money that Jill gave. (c) Calculate the value of A. (4) 12 *N34854A01228*
25 physicsandmathstutor.com January 2010 Question 7 continued Q7 (Total 9 marks) *N34854A01528* 15 Turn over
26 physicsandmathstutor.com June A sequence of positive numbers is defined by a a 2 a 3, n 1, n+ 1 n + 1 = 2 (a) Find a 2 and a 3, leaving your answers in surd form. (b) Show that a 5 = 4 8 *H35383A0828*
27 physicsandmathstutor.com June A farmer has a pay scheme to keep fruit pickers working throughout the 30 day season. He pays a for their first day, (a + d ) for their second day, (a + 2d ) for their third day, and so on, thus increasing the daily payment by d for each extra day they work. A picker who works for all 30 days will earn on the final day. (a) Use this information to form an equation in a and d. A picker who works for all 30 days will earn a total of 1005 (b) Show that 15(a ) = 1005 (c) Hence find the value of a and the value of d. (4) 18 *H35383A01828*
28 physicsandmathstutor.com January A sequence a1, a2, a 3,... is defined by a1 = 2 an+ 1 = 3an c where c is a constant. (a) Find an expression for a 2 in terms of c. Given that 3 i= 1 a = 0 i (1) (b) find the value of c. (4) 6 *h35402a0624*
29 physicsandmathstutor.com January An arithmetic sequence has first term a and common difference d. The sum of the first 10 terms of the sequence is 162. (a) Show that 10a+ 45d = 162 Given also that the sixth term of the sequence is 17, (b) write down a second equation in a and d, (1) (c) find the value of a and the value of d. (4) 10 *h35402a01024*
30 physicsandmathstutor.com June A sequence a1, a2, a 3,... is defined by a = k, 1 a = 5a + 3, n 1, n+ 1 n where k is a positive integer. (a) Write down an expression for a 2 in terms of k. (b) Show that a3 = 25k (c) (i) Find a in terms of k, in its simplest form. r = r 1 (1) 4 (ii) Show that a is divisible by 6. r = r 1 (4) 10 *P38157A01028*
31 physicsandmathstutor.com June (a) Calculate the sum of all the even numbers from 2 to 100 inclusive, (3) (b) In the arithmetic series k + 2k + 3k k is a positive integer and k is a factor of 100. (i) Find, in terms of k, an expression for the number of terms in this series. (ii) Show that the sum of this series is k (4) (c) Find, in terms of k, the 50th term of the arithmetic sequence (2k + 1), (4k + 4), (6k + 7),..., giving your answer in its simplest form. 20 *P38157A02028*
32 physicsandmathstutor.com June 2011 Question 9 continued *P38157A02128* 21 Turn over
33 physicsandmathstutor.com January A sequence x1, x2, x3,... is defined by x 1 = 1 x = n+ ax + 1 n 5, n 1 where a is a constant. (a) Write down an expression for x 2 in terms of a. 2 (b) Show that x = a + 5a+ 5 3 (1) Given that x 3 = 41 (c) find the possible values of a. (3) 8 *P40082A0828*
34 physicsandmathstutor.com January A company offers two salary schemes for a 10-year period, Year 1 to Year 10 inclusive. Scheme 1: Salary in Year 1 is P. Salary increases by (2T) each year, forming an arithmetic sequence. Scheme 2: Salary in Year 1 is (P ). Salary increases by T each year, forming an arithmetic sequence. (a) Show that the total earned under Salary Scheme 1 for the 10-year period is (10P + 90T) For the 10-year period, the total earned is the same for both salary schemes. (b) Find the value of T. (4) For this value of T, the salary in Year 10 under Salary Scheme 2 is (c) Find the value of P. (3) 22 *P40082A02228*
35 physicsandmathstutor.com January 2012 Question 9 continued *P40082A02328* 23 Turn over
36 physicsandmathstutor.com June A sequence of numbers a 1, a 2, a 3... is defined by a 1 = 3 a n +1 = 2a n c (n 1) where c is a constant. (a) Write down an expression, in terms of c, for a 2 (1) (b) Show that a 3 = 12 3c Given that 4 i= 1 a i 23 (c) find the range of values of c. (4) 8 *P40684A0824*
37 physicsandmathstutor.com June A boy saves some money over a period of 60 weeks. He saves 10p in week 1, 15p in week 2, 20p in week 3 and so on until week 60. His weekly savings form an arithmetic sequence. (a) Find how much he saves in week 15 (b) Calculate the total amount he saves over the 60 week period. (3) The boy s sister also saves some money each week over a period of m weeks. She saves 10p in week 1, 20p in week 2, 30p in week 3 and so on so that her weekly savings form an arithmetic sequence. She saves a total of 63 in the m weeks. (c) Show that m(m + 1) = (4) (d) Hence write down the value of m. (1) 10 *P40684A01024*
38 physicsandmathstutor.com June 2012 Question 6 continued *P40684A01124* 11 Turn over
39 physicsandmathstutor.com January A sequence u1, u2, u3,... satisfies un + 1 = 2un 1, n 1 Given that u 2 = 9, (a) find the value of u 3 and the value of u 4, (b) evaluate 4 r = 1 u r. (3) 6 *P41488A0632*
40 physicsandmathstutor.com January Lewis played a game of space invaders. He scored points for each spaceship that he captured. Lewis scored 140 points for capturing his first spaceship. He scored 160 points for capturing his second spaceship, 180 points for capturing his third spaceship, and so on. The number of points scored for capturing each successive spaceship formed an arithmetic sequence. (a) Find the number of points that Lewis scored for capturing his 20th spaceship. (b) Find the total number of points Lewis scored for capturing his first 20 spaceships. (3) Sian played an adventure game. She scored points for each dragon that she captured. The number of points that Sian scored for capturing each successive dragon formed an arithmetic sequence. Sian captured n dragons and the total number of points that she scored for capturing all n dragons was Given that Sian scored 300 points for capturing her first dragon and then 700 points for capturing her n th dragon, (c) find the value of n. (3) 16 *P41488A01632*
41 physicsandmathstutor.com January 2013 Question 7 continued *P41488A01732* 17 Turn over
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46 physicsandmathstutor.com June A sequence a 1, a 2, a 3,... is defined by a 1 = 4 a n +1 = k (a n + 2), for n 1 where k is a constant. (a) Find an expression for a 2 in terms of k. Given that 3 a i = i= 1 2, (1) (b) find the two possible values of k. (6) 6 *P41802A0628*
47 physicsandmathstutor.com June A company, which is making 200 mobile phones each week, plans to increase its production. The number of mobile phones produced is to be increased by 20 each week from 200 in week 1 to 220 in week 2, to 240 in week 3 and so on, until it is producing 600 in week N. (a) Find the value of N. The company then plans to continue to make 600 mobile phones each week. (b) Find the total number of mobile phones that will be made in the first 52 weeks starting from and including week 1. (5) 12 *P41802A01228*
48 Core Mathematics C1 Mensuration Surface area of sphere = 4π r 2 Area of curved surface of cone = π r slant height Arithmetic series u n = a + (n 1)d S n = 2 1 n(a + l) = 2 1 n[2a + (n 1)d] 4 Edexcel AS/A level Mathematics Formulae List: Core Mathematics C1 Issue 1 September 2009
Section 8.3 Trigonometric Equations
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