Your fraction that is equal to 3/12 is 1/4
You did not provide a list of expressions to select from.
Let A = area
Let w = width
Let (w + 5) = length
A = (w + 5)w
What are the answer choices
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it’s 9 sq feet
use A=b•h/2
the base length is 6
the height is 3
6•3= 18 then divided by 2 is 9
Assuming the given is: 5u^7 - 21u^7
Since both algebraic terms are identical (both are using u^7), we can subtract the coefficients directly, as in: 5 - 21 = -16
Therefore, 5u^7 - 21u^7 = -16u^7