19. solve the equation 3(x - 7) = 42.
• a. 21
b. 49
c. 36
d.7

For this case we must solve the following equation:

Applying distributive property to the terms within the parenthesis we have:

Adding 21 to both sides of the equation:

Dividing between 3 on both sides of the equation:

The correct answer is option A.  21

Step-by-step explanation:

It is given an expression in variable x, 3(x - 7) = 42

To find the value of x

Let  3(x - 7) = 42

3x - (3 * 7) = 42   (Open the bracket)

3x - 21 = 42

3x = 42 + 21

3x = 63

x = 63/3 = 21

Therefore the value of x = 21

The correct answer is option A.  21

b. x- 48 =120

step-by-step explanation:

312312

step-by-step explanation: