Question

Solve the equation using mental math. 7 + r = 15

Answer 1

Answer:

$\displaystyle 8 = r$

Step-by-step explanation:

7 + r = 15

- 7 - 7

________

$\displaystyle r = 8$

I am joyous to assist you anytime.

Answer 2

Answer:

r = 8

Step-by-step explanation:

7 + 8 = 15

so r = 8!