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it is A=1/2h(b1+b2)for b1

A=0.5*h*(b1+b2)
2A/h=b1+b2
b1=2A/h-b2

what?

no that is the question that my techer gave me

So what is your question?

i mean right

None of them are right...

yes i got it it is b1=AH-b2

i mean it hase to be

Why? Try going from that back to the area formula for a trapezoid.

ok

i got b2=1/2hb1a

Write out your steps? I swear you need a subtraction in there somewhere.

me to

b1= 1/2AH-b2

i do not get any of it

can you help

hey taking a look

so what was given was the first line? b1 = 2Ah – b2

14. Solve the area formula for a trapezoid

ah ok so this is the formula of the trapazoid? t is A=1/2h(b1+b2)for b1

2A = 1/2h(b1+b2)

err sorry 2A/h = b1+ b2

b1 = 2A/h - b2

but how

that is what i do not get

ok so
1. A=1/2h(b1+b2)
2. A = h/2(b1 + b2) (another way to write 1/2h is h/2)

now we want to multiply both sides by 2

and we get
3. 2A = h(b1 + b2)

so 2A/h = h(b1+b2)/h

and since we know h/h = 1, we can get rid of h on the right side

so 2A/h = b1+b2

so now, to get b1 by itself, we need to subtract b2 from both sides

so 2A/h - b2 = b1+b2-b2

that eliminates the b2 on the right side, and leaves b1 alone

oh ok

sp 2A/h - b2 = b1, or b1 = 2A/h - b2

ok i am starting to get it

but as far as the options go on your multiple choice - I don't see any that match

ok i will contact my techer

tomorrow

ok sorry =(

you could try inputting different values for b1 and b2

and h

and see which answer matches the from the choices and the original equation

ok

but I would do it with our answer first

and see if they match up to the original area equation

if different values of b1,h, and b2 are always equal for our answer, it's almost certianly correct

and yeah, ask your teacher. worst case we're wrong and you have bonus points

ok that would be cool lol

thx for helping me