B is the answer i think or just google it
To solve for the time it takes to travel a certain distance at a certain speed, use the formula,
time = distance / speed
Given that the entire journey takes four hours, add up the time it takes David to row upstream with that of him travelling downstream. This is mathematically represented as,
total time = time upstream + time downstream
4 = 3/(x - 1) + 3/(x +1)
Solving for x in the equation gives 2. Thus, David's speed in still water is 2 miles per hour.
Substitute the valus of x and see which answer fits.
for x=0, y = 4·0 - 3 = -3
for x=1, y = 4·1 -3 = 1
Only the 2nd choice matches:
Input x 0 1 2 Output y -3 1 5
Answer:
what are the numbers
Step-by-step explanation:
Answer: 2400
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Work Shown:
(80 push-ups)/(2 minutes) = (x push-ups)/(60 minutes)
80/2 = x/60
40 = x/60
40*60 = x
2400 = x
x = 2400
He can do 2400 pushups per hour, assuming he keeps at this same rate.