Question

Trapezoid problem? (Geometry)

Answer 1

I set up the equation as 3x+5=1/2[(7x+4)+4] but I got the wrong answer. I dont understand how to do it, please help?

Answer 2

what value of x did you get?

Answer 3

I got 10, but the answer is 11. I dont know how to get 11 though..

Answer 4

ah, \(\overline{EF}\) is asked.

what did you get for x?

Answer 5

I told you haha, I got 10...

Answer 6

something went wrong in your algebra. let's compare results.

\[3x+5=(1/2)[(7x+4)+4]\\2(3x+5)=(7x+4)+4\\6x+10=7x+8\]

Answer 7

Where did you get the 2 from? And where did the 1/2 go?

Answer 8

i multiplied the first equation by 2 to clear denominator

Answer 9

That would've been better...but if you solve it like that wouldnt x=6?

Answer 10

6x+10-6x=7x+8-6x
10 = x + 8
10-8=x-8
2=x

Answer 11

\[\overline{EF}=3x+5=3(2)+5=11\]

Answer 12

uhm, the third line should read
10-8=x+8-8

Answer 13

Oh I see...but I thought Line EF was half of line BC...?