Answer:

Estimated
Step-by-step explanation:
21x + 28. just distribute the 7.
Answer;
24 or 144.... figure it out bud
Step-by-step explanation:
Length x width x height=
5x - 4y = 7
x = 5 - y
5(5 - y) - 4y = 7
25 - 5y - 4y = 7
-5y - 4y = 7 - 25
-9y = - 18
y = -18/-9
y = 2 <== y coordinate is 2
4 x N + 2
8 x N -20
n= number hope this helps