Answer:
A. 15, 20, and 25
Step-by-step explanation:
Note that 3-4-5 is a pythagorean triple via following:

Dividing 15, 20, and 25 by 5 nets you the pythagorean triple 3-4-5.
Answer:
89.03
Step-by-step explanation:
29x3.07=89.03
Answer:
x + 52 + 78 = 180
Step-by-step explanation:
By angle sum property of a triangle:

Exact
Approximation
Estimate
Exact
Retail price
1.34×35=46.9
Retail price
1.34×56=75.04