Determine the recursive formula for the sequence 10, -30, 90, -270, ...

y = 10 * (-3)^x

Step-by-step explanation:

Let's divide this by 10, so y=10a,

a = 1, -3, 9, -27

It looks like there's an alternating plus and minus, which can be dealt with using a = (-1)^b. Now,

b = 1, 3, 9, 27

this is the powers of 3! the equation b=3^x should satisfy this!

Now we can put our answers together:
y = 10*(-1)^(3^x)

y = 10 * (-3)^x

135 is your answer

step-by-step explanation:

try 180 times three then divide that number by 4 (sides) to get your answer. im glad to : )