SOLUTION: my question is: the area of a trapezoid is A=(a+b)h .there is a line under that with a 2 under it. If A=300, h=5, and b=30, what is the value of a?

Algebra ->  Expressions -> SOLUTION: my question is: the area of a trapezoid is A=(a+b)h .there is a line under that with a 2 under it. If A=300, h=5, and b=30, what is the value of a?      Log On


   

Question 202129: my question is: the area of a trapezoid is A=(a+b)h .there is a line under that with a 2 under it. If A=300, h=5, and b=30, what is the value of a?
Answer by rfer(16322) About Me  (Show Source):
You can put this solution on YOUR website!
A=((a+b)h)/2
300=((a+30)5)/2
2*300=5a+150
450=5a
a=90