Answer:
A
Step-by-step explanation:
No because the sum could also be irrational number which for example it could be square root of 9 or 49
Hope this helps answer your question
Answer:

Step-by-step explanation:
Cross multiply, isolate the variable, and divide by the coefficient to solve.

Plug back in to check.

The answer is 5. Measure r and t are congruent. Measure r is 20 so measure t is also 20. So by dividing 20 by 4 you get 5.