Question

PLEASE HELP ME I'M GIVING OUT LOTS OF POINTS!!

Answer 1

Hi, mal :> hehehe

( its
`a_(1) = -11`)

Your welcome..... ;]

Answer 2

(d) a1 = 11

Explanation:

Put the numbers in the given formula and solve for a1.

a5 = 176 = a1(r^(5-1)) = a1·r^4

a7 = 704 = a1(r^(7-1)) = a1·r^6

Dividing a7 by a5 gives ...

a7/a5 = (a1·r^6)/(a1·r^4) = r^2 = 704/176 = 4

Then a1 is ...

a1 = a5/(r^4) = 176/(r²)² = 176/(4²) = 11

The first term is 11.