Use the pythagorean theorem to find A
23²=a²+17²

240

Step-by-step explanation:

23^2 = a^2 + 17^2

529 = a^2 + 289

529 - 289 = a^2

240 = a ^ 2

240 is not a perfect square number

maybe your question is wrong

see explanation

step-by-step explanation:

since the sequence is geometric there is a common ratio r between consecutive terms, that is

r = 4 ÷ - 2 = - 2

r = - 8 ÷ 4 = - 2

r = 16 ÷ 8 = - 2

the next term - 13 must be incorrect as it should be - 32 for the sequence to be geometric.

the first 4 terms are therefore geometric with common ratio r = - 2