Answer:
Step-by-step explanation:
Let x represent the time that they spent biking at the first speed.
If the ride was six hours long, it means that the time they spent biking at the other speed is (6 - x) hours.
Distance = speed × time
For the first part of the ride, they biked at a speed of 7 mph. This means that the distance travelled during the first part of the ride is
7 × x = 7x
For part of the ride, they biked at a speed of 11 mph. This means that the distance travelled during the second part of the ride is
11(6 - x)
Since the total distance that the kids traveled is 54 miles, then
11(6 - x) + 7x = 54
66 - 11x + 7x = 54
11x - 7x = 66 - 54
4x = 12
x = 12/4 = 3
They spent 3 hours biking at the first speed.
They spent 6 - 3 = 3 hours biking at the other speed.
The correct answer is Choice A: 30.
To find the amount of interest, we have to use the formula for compounded interest.
It would be: y = 500(1 + 0.03/4)^(8)
We divided the 3% by 4 because it is quarterly. We raised it to the 8th power, because it will be compounded 8 times (4 x 2).
The interest comes out to $30.80.
(Daddy Mamma Sissy Bubba Rover=Divide Multiply Subtract Borrow Repeat/remainder)
I think it’s 27 3/4 since you just had the 21 and 6 together and it should be the same fraction