Devontre rode his bike uphill 5 miles and then back downhill. the rate at which devontre traveled downhill was 20 mph faster than his rate going uphill. if it took him 20 minutes longer to ride uphill than downhill, what was his uphill rate?

10 mph

Step-by-step explanation:

Let x mph be Devontre rate uphill, then x+20 mph its his rate downhill.

1. Time uphill:

2. Time downhill:

3. If it took him 20 minutes (1/3 hour) longer to ride uphill than downhill, then

Solve this equation:

The rate cannot be negative, thus, x=10 mph (rate uphill).

the answer is 16ft

step-by-step explanation:

answer

explanation

the area of a circle is calculated using the formula

or

we can use any of the above formulae to calculate the required. preferably, let us use the latter since the diameter is

we substitute the diameter into the formula to get:

this is the exact value for the area of the circle.

the correct answer is a