Step-by-step explanation:
5(x + 7) = 15
x+7=3
x=-4!!!!!!
Answer:
168
Step-by-step explanation:
2x80 is 160 plus 2x4 is 8 160+8 is 168
Answer:
He can add through calculater or by doing addition in his mind
Answer:
E. he multiplied 9 and 0.7 incorrectly.
Step-by-step explanation:
Answer:
, 
Step-by-step explanation:
<h3>
I will use the elimination method.</h3>
We want to make the X's the same:


Because the signs of the X's are the same we subtract the 2 equations to make:
(I put the second one on top of the 1st)

So:

Substitute y into either equation 1 or 2:
(I chose equation 1)



So:
