Answer:
(A) 21
Step-by-step explanation:
5x-15 needs to equal 90 since it is a right angle and 21 makes that true

Answer:
do no
Step-by-step explanation:
Answer:

Step-by-step explanation:

** The above answer is written in reverse, which is the exact same result.
I am joyous to assist you anytime.
Answer:
-5x-10
Step-by-step explanation: