ok what is 14. Solve the area formula for a trapezoid, , for .
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OpenStudy (anonymous):
it is A=1/2h(b1+b2)for b1
OpenStudy (anonymous):
A=0.5*h*(b1+b2)
2A/h=b1+b2
b1=2A/h-b2
OpenStudy (anonymous):
what?
OpenStudy (anonymous):
Well, from your partially written out question, I assumed you want to solve the trapezoid formula for b1.
OpenStudy (anonymous):
no that is the question that my techer gave me
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OpenStudy (anonymous):
So what is your question?
OpenStudy (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
OpenStudy (anonymous):
i mean right
OpenStudy (anonymous):
None of them are right...
OpenStudy (anonymous):
yes i got it it is b1=AH-b2
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OpenStudy (anonymous):
i mean it hase to be
OpenStudy (anonymous):
Why? Try going from that back to the area formula for a trapezoid.
OpenStudy (anonymous):
ok
OpenStudy (anonymous):
i got b2=1/2hb1a
OpenStudy (anonymous):
Write out your steps? I swear you need a subtraction in there somewhere.
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OpenStudy (anonymous):
me to
OpenStudy (anonymous):
b1= 1/2AH-b2
OpenStudy (anonymous):
i do not get any of it
OpenStudy (anonymous):
can you help
OpenStudy (sandra):
hey taking a look
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OpenStudy (sandra):
so what was given was the first line? b1 = 2Ah – b2
OpenStudy (anonymous):
14. Solve the area formula for a trapezoid
OpenStudy (sandra):
ah ok so this is the formula of the trapazoid? t is A=1/2h(b1+b2)for b1
OpenStudy (sandra):
2A = 1/2h(b1+b2)
OpenStudy (sandra):
err sorry 2A/h = b1+ b2
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OpenStudy (sandra):
b1 = 2A/h - b2
OpenStudy (anonymous):
but how
OpenStudy (anonymous):
that is what i do not get
OpenStudy (sandra):
ok so
1. A=1/2h(b1+b2)
2. A = h/2(b1 + b2) (another way to write 1/2h is h/2)
OpenStudy (sandra):
now we want to multiply both sides by 2
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OpenStudy (sandra):
and we get
3. 2A = h(b1 + b2)
OpenStudy (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
OpenStudy (sandra):
so 2A/h = h(b1+b2)/h
OpenStudy (sandra):
and since we know h/h = 1, we can get rid of h on the right side
OpenStudy (sandra):
so 2A/h = b1+b2
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OpenStudy (sandra):
so now, to get b1 by itself, we need to subtract b2 from both sides
OpenStudy (sandra):
so 2A/h - b2 = b1+b2-b2
OpenStudy (sandra):
that eliminates the b2 on the right side, and leaves b1 alone
OpenStudy (anonymous):
oh ok
OpenStudy (sandra):
sp 2A/h - b2 = b1, or b1 = 2A/h - b2
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OpenStudy (anonymous):
ok i am starting to get it
OpenStudy (sandra):
but as far as the options go on your multiple choice - I don't see any that match
OpenStudy (anonymous):
ok i will contact my techer
OpenStudy (anonymous):
tomorrow
OpenStudy (sandra):
ok sorry =(
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OpenStudy (sandra):
you could try inputting different values for b1 and b2
OpenStudy (sandra):
and h
OpenStudy (sandra):
and see which answer matches the from the choices and the original equation
OpenStudy (anonymous):
ok
OpenStudy (sandra):
but I would do it with our answer first
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OpenStudy (sandra):
and see if they match up to the original area equation
OpenStudy (sandra):
if different values of b1,h, and b2 are always equal for our answer, it's almost certianly correct
OpenStudy (sandra):
and yeah, ask your teacher. worst case we're wrong and you have bonus points