Answer: the speed of the plane is 130 mph
Step-by-step explanation:
Let x represent the speed of the plane. If the car travels 80 mph slower than the plane, then the speed of the car would be (x - 80) mph.
Time = Distance/speed
plane can fly 520 miles in the same time as it takes a car to go 200 miles. This means that the time it takes the plane to fly 520 miles is
520/x
Also, the time it takes the car to drive 200 miles is
200/(x - 80)
Since the time is the same, it means that
520/x = 200/(x - 80)
Cross multiplying, it becomes
520(x - 80) = 200 × x
520x - 41600 = 200x
520x - 200x = 41600
320x = 41600
x = 41600/320
x = 130 mph
the square root of 9 would be 3. as 3 x 3 =9
the square root of any number is asking what number times itself will give you the given number you are trying to square root. for example, the square root of 36 would be 6, as 6 x 6 = 36. I hope this helped
Answer:
Step-by-step explanation:
- 7.5b^3=7.5(2)^3=7.5×8=60
- 8.5+6c=8.5+6×7=8.5+42=50.5
Answer:
Juliet collect 35 cans
Step-by-step explanation:
Let
x ------> number of cans collected by Juliet
y ------> number of cans collected by Rosana
z ------> number of cans collected by Santiago
we know that
-----> equation A
----> ----> equation B
-----> equation C
Substitute equation B and equation C in equation A and solve for x
Combine like terms
Adds 10 both sides
Divide by 4 both sides
therefore
Juliet collect 35 cans