From your information
Let shorter base = h +3 and longer base = h + 7 where h is the height.
Formula for area of a trapezoid is

Substituting into the formula we get the following equation.



This is a quadratic equation which I will solve by factoring.



this is a useable answer (it's positive and length must be nonnegative)

can't use this answer
so shorter base = 10 + 3 = 13 yards and longer base = 10 + 7 = 17 yards
Answer:
1/25 or .04
Step-by-step explanation:
probability of landing on a yellow sector first = 1/5
probability of landing on a blue sector=1/5
and then you multiply the two. (1/5)(1/5)=1/25
Let u be speed while Lisa drove 240 miles and t be the time in completing 240 miles.
We have been given that Lisa increased her speed 20 mph than initial speed over next 540 miles. So her speed on next 540 miles will be
mph.
Further more we are given that she took 3 hours more to complete the next 540 miles of the trip than she took in completing initial 240 miles. So she took
hours in completing next 540 miles.
Since we know 
Now we will substitute our given values in our equation and find out the unknowns. After substitution we will get two equations and two unknowns.

Now we will substitute equation 1 in equation 2

Upon solving this equation, we get

Therefore, total time for Lisa to complete the entire trip is 6+6+3 = 15 hours.
And we know that total distance covered is 240+540 = 780 miles
Hence, average speed

Step-by-step explanation:
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