Answer:
a) 
Step-by-step explanation:
this is a right triangle so you can use the Pythagorean Theorem:
the sum of the legs, squared, is equal to the hypotenuse, squared
10² + b² = 13²
100 + b² = 169
b² = 69
b = 
Answer:
3(15f + 8)
Step-by-step explanation:
9f + 27 + 36f - 3
We can take out 3.
3(3f + 9 + 12f -1)
3(15f + 8)
The MAD is <span>2.2857142857143, so about 2</span>