ok what is 14. Solve the area formula for a trapezoid, , for .

- anonymous

ok what is 14. Solve the area formula for a trapezoid, , for .

- chestercat

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- anonymous

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

- anonymous

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

- anonymous

what?

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## More answers

- anonymous

Well, from your partially written out question, I assumed you want to solve the trapezoid formula for b1.

- anonymous

no that is the question that my techer gave me

- anonymous

So what is your question?

- anonymous

14. Solve the area formula for a trapezoid, , for . (2 points)
b1 = 2Ah – b2
1.b1= 2Ahb2
2.b1=2A/hb1
3.b1=1/2ahb1
4.b1= 2Ahb2
wech wo is rifgt

- anonymous

i mean right

- anonymous

None of them are right...

- anonymous

yes i got it it is b1=AH-b2

- anonymous

i mean it hase to be

- anonymous

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

- anonymous

ok

- anonymous

i got b2=1/2hb1a

- anonymous

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

- anonymous

me to

- anonymous

b1= 1/2AH-b2

- anonymous

i do not get any of it

- anonymous

can you help

- sandra

hey taking a look

- sandra

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

- anonymous

14. Solve the area formula for a trapezoid

- sandra

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

- sandra

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

- sandra

err sorry 2A/h = b1+ b2

- sandra

b1 = 2A/h - b2

- anonymous

but how

- anonymous

that is what i do not get

- sandra

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

- sandra

now we want to multiply both sides by 2

- sandra

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

- sandra

now we want to divide both sides by h, to get rid of the h - the whole point here is trying to get b1 by itself - so we continuously perform the same operation to both sides of the equation until it's alone - since if you do the same thing be it multiple, divide, or add to both sides, you still have a valid equation

- sandra

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

- sandra

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

- sandra

so 2A/h = b1+b2

- sandra

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

- sandra

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

- sandra

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

- anonymous

oh ok

- sandra

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

- anonymous

ok i am starting to get it

- sandra

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

- anonymous

ok i will contact my techer

- anonymous

tomorrow

- sandra

ok sorry =(

- sandra

you could try inputting different values for b1 and b2

- sandra

and h

- sandra

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

- anonymous

ok

- sandra

but I would do it with our answer first

- sandra

and see if they match up to the original area equation

- sandra

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

- sandra

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

- anonymous

ok that would be cool lol

- anonymous

thx for helping me

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