so you need to get "a" alone
a-2+3=-2
subtract 3 from both sides
a - 2 = -2-3
a - 2 = -5
then add two to both sides
a = -3
as your answer
I’m guessing red at this point-
I will help once you give me the puzzle... LOL
When the x-value has increased by 1 unit, the y-value has multiplied by 3, so we expect a function of the form (something)×(3^x). The last choice has that.
... f(x) = 4(3)^x
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You can always evaluate the offered choices at the given points to see which of them works. The second point (2, 36) will tell you the fastest.
4·3^-2 = 4/9 ≠ 36 . . . . . you can tell at this point you don't want -x as the exponent
3·4^-2 = 3/16 ≠ 36
3·4^2 = 48 ≠ 36
4·3^2 = 36 = 36 . . . . this is the one you want