Answer:
See below
Step-by-step explanation:
1)
7(3 + 5) = 21 + 35.
7 * 3 = 21 to fill the first square, 7 * 5 = 35 to fill the second square.
2)
15 - 10 = x(3 - 2)
Subtract inside parenthesis.
15 - 10 = x(1)
Cancel the 1.
15 - 10 = x
Subtract.
x = 5.
Proof:
15 - 10 = 5(3 - 2)
15 - 10 = 5(1)
15 - 10 = 5
5 = 5.
