7x - (25x^2 + 12x) = 7x - 25x^2 - 12x = -25x^2 - 5x
I think what you mean is:

Then using our rules of exponents, this is the same as
Answer:
24
Step-by-step explanation:
You have to add all sides of length to get the perimeter
Answer:
20
Step-by-step explanation:
Assume n is the number of times she pick a skittle out of the bag
The probability she pick out red : 8/n
The probability she pick out yellow : 12/n
=> The ratio of red and yellow skittle : 8/n : 12/n = 8/12 = 2/3, means every 2 red skittles we have 3 yellow ones.
But we have 50 skittles, so the likely numbers of reds in the bag is = 2*
= 20