Question

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Answer 1

you are given an = 4n + 5

so for part i) you would just substitute n = 1 into the expression and find an

then repeat this for n = 2, 3, 4

Answer 2

4(1)+5=9
4(2)+5=13
4(3)+5=17
4(4)+5=21

Answer 3

good. now, for part II it asks for the 1st term and the 10th term. let n = 1 and n = 10 and then calculate the an values just like you did for part I

Answer 4

so the first equation for 1 would be the same right?

Answer 5

4(10)+5=45

Answer 6

yes, so 1st term = 9 and 10th term = 45

Answer 7

now for part III we use the sum formula

Answer 8

a1 = 9
an = 45
n = 10

Answer 9

find sn

Answer 10

270

Answer 11

good that's it