Question

Lisa is four years younger than her sister. Which expression below stands for the sum of Lisa’s age and her sister’s age? (if you see this question pls answer) ty!

None of these
(x − 4) − x
x − (x − 4)
(x + 4) − x

Answer 1

none of these

Explanation:

because we don't know her sisters age we'll use "x" and Lisa is 4 years younger so you deduct 4 from x and the equation will be '4-x'

Answer 2

i say it would be "None of these"

Explanation:

because say x=sisters age so, x=12 if lisa if 4 years youger, than x-4=8 (x-4)-x=(-2) x-(x-4)=4 (x+4)-x=4 so therefore it would be none.