Mike ($3.75): x
Friends ($3.75): 3x
Mike + Friends ≤ 25
3.75(x) + 3.75(3x) ≤ 25
3.75x + 11.25x ≤ 25
15x ≤ 25
≤ 
x ≤ 1
Answer: they can rent the paddleboards for 1 hour 40 minutes
Given:
36 is the dividend
4 is the divisor
Since, 4 is the divisor, you are going to want to see how many times 4 can fit into 36 evenly:
4*1=4, 4*2=8, 4*3=12, 4*4=16, 4*5=20, 4*6=24, 4*7=28, 4*9= 36
As you can see above, 4 goes into 36, 9 times evenly:
36/4 = 9
Quotient: 9
I hope this helps!
Your answer is D because his line needs to be slightly above +25 each time 50+25=75 so his line would be above 75
The probability is 10/12. If you need it as a decimal, it should be about 8.3%