(ignore the 2 on the second blank) first blank: a. commutative property b. multiplication property c. division property of equality d. subtraction property of equality second blank: a. 2 b. 6.5 c. 19.5 d. 84.5

D. Subtraction property of equality

B. 6.5

Step-by-step explanation:

First blank:

The equation is x + 6.5 = 13.

To solve the equation, you want x alone on the left side, showing "x = some number." Since 6.5 is being added to x, you need to SUBTRACT 6.5. You must do the same operation to both sides of an equation, so you need to SUBTRACT 6.5 from both sides of the equation. What allows you to subtract the same number from both sides of an equation is the

D. Subtraction property of equality

Second blank:

Subtract 6.5 from both sides.

x + 6.5 = 13

x + 6.5 - 6.5 = 13 - 6.5

x = 6.5

B. 6.5

step-by-step explanation:

hans did not square the 40-unit side; he merely multiplied it by 2.   incorrect.