This expression is a difference of squares:

Answer:
69.9245
Step-by-step explanation:
Speed of ball = 13.07 × swimming speed
Speed of ball = 13.07 × 5.35
Okay, so on number one I have no idea. I keep getting 20 because 14 - (-3)2 = 14- (-6) which is really 14 + 6=20.
Number 2 is r+15=61
Number 3 I didn't get any of those answers because you have to solve what is in the parenthesis first so3*5= 15+1=16 then you multiply that by two giving you 16*2=32 and 42-32=10
Answer:
12.5m³
Step-by-step explanation:
V = w × h × l = 1.43 × 3.13 × 2.8 = 12.5m³
Have a good day