I would need a picture of the angle to the right to solve it
Answer:
5mph
Step-by-step explanation:
Let speed of boat in still water is s.
Distance proportional to speed
90/10 = (s+ 4)/(s - 4)
=> 9s - 36 = s + 4
=> 8s = 40
=> s= 5 mph
:-)
Answer:
I would say A because the real answer is 23.477
Step-by-step explanation:
Answer:

Step-by-step explanation:
Area = pi*r^2
Area = pi*9^2
Area = 
Yes because 3² + 4² = 5²
to be sure
9 + 16 = 25
25 = 25