Answer:
57 mph
Step-by-step explanation:
Let b represent Bob's speed on the trip. Then his time is ...
time = distance/speed
Bob's time = 230/b
Then John's speed is b+8, and his time is ...
John's time = 230/(b+8)
The difference of their times is 1/2 hour:
Bob's time - John's time = 1/2
230/b -230/(b+8) = 1/2 . . . substitute the expressions for time
460(b+8 -b) = b(b+8) . . . . . multiply by 2b(b+8)
b^2 +8b -3680 = 0 . . . . . . .put in standard form
(b +4)^2 -3696 = 0 . . . . . . . add 16-16 to complete the square
b = -4 +√3696 ≈ 56.795 . . . solve for positive b
Bob's drove about 57 mph on the trip.
Answer: 2
2x4=8
2x3=6
2x5=10
Step-by-step explanation:
Answer
he assaighed 6 problems to each of them
Step-by-step explanation:
he assaighned 2 to each if the total is 30 that means 30 / 5 = 6 so x = 4 and the student had 6 problems
Imma keep it a buck with you bruh ion really know how to do this but imma trying answer question so 3 times 6.20 = x and 4 times 6.90 = and what you get for that and avg. that
