Question

ANSWER ASAP

Which sequence has a common ratio of -2?
{4, -6, 8, -10, 12, …}
{-1, 2, -4, 8, -16, …}
{900, -450, 225, -112.5, 56.25, …}
{29, 27, 25, 23, 21, …}

Answer 1

{ -1, 2, -4, 8, -16...}

Explanation:

Common ratio : the constant pure number you get when you divide a term to the one before it.

thus, 2 ÷ -1 = -2

to check if the common ratio is -2 , divide each terms in front by the one before it.

... 8 ÷ 4 = -2 we got -2 again so the common ratio of this geometric progression is -2.