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NO ONE EVER HELPS ME , PLEASE HELP ME I NEED HELP!
If A=1/2 h (b1 +b2) is the formula for the area of a trapezoid, find the height of the trapezoid that has an area of 78 in ^2 and base lengths 5 in and 8 in.

NO ONE EVER HELPS ME PLEASE HELP ME I NEED HELP If A12 h b1 b2 is the formula for the area of a trapezoid find the height of the trapezoid that has an area of 7 class=

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Answer:

A is the answer  

12 in

first substitute the variables

then 78=1/2h(5 + 8)

this makes it an equation

add similar terms which equals to

78=1/2xhx13

then divide both sides by 13

6=1/2xh

lastly divide both sides by 1/2

12=h

Step-by-step explanation:

proof

A=1/2x12(5 + 8) then

A=1/2x12x13  then

   A=6x13  then

       A= 78in^2

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