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, …}

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

Step-by-step 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.

i dont know if you cant find a way its best to actually add all of them start from 105 tho

step-by-step explanation:

n=9

step-by-step explanation:

7 times a number = 7n

decreased by 13 = 7n-13

same as is =

5 times the number = 5n

increased by 5 = 5n+5

7n-13 = 5n+5

2n=18

n=9