What statement best fills in the last blank of the proof and completes the sentence: " by the substitution property of "

A.        

Step-by-step explanation:

We have been given that angle A is a right angle and angle B is a right angle. We are asked to choose the correct option that completes the last statement of the proof.

Let us prove that step by step.

First blank:

We have been given that .

Second blank:  

This means that and

Third blank:

By the definition of right angles a right angle is an angle of exactly 90°.

Last blank:  

Substitution property of equality states that if

Hence, by the substitution property of equality .

Therefore, the statement completes the last blank of the proof and option A is the correct choice.  

15

step-by-step explanation:

we are given the following expression and we are to solve it and find the product:

-13 × (-5)

solving the given expression in the standard order of solving a mathematical expression, beginning with the opening of brackets and then multiplying the terms and changing their signs.

-3 × -5 = 15 (answer is positive because when negative is multiplied with negative, it gives a positive answer)

597

step-by-step explanation: