Part A: Solve A = 9 over 2(x + 28) for x. (4 points) Part B: Determine the value of x when A = 135. (2 points) Part C: Solve –np – 40 10 for n. Show your work. (4 points)

Question

Part A: Solve A = 9 over 2(x + 28) for x. (4 points) Part B: Determine the value of x when A = 135. (2 points) Part C: Solve –np – 40 > 10 for n. Show your work. (4 points)

anonymous · Answer

i need help with this i dont understand how to do this

anonymous · Answer

anyone?

anonymous · Answer

could you post a picture of the question?

anonymous · Answer

yea can you please post a picture I am kinda lost.

anonymous · Answer

that is the question

anonymous · Answer

9/2(x+28). solve for x

anonymous · Answer

thats what its asking

anonymous · Answer

i need help understanding how to solve for x

anonymous · Answer

use cross-multiplication

anonymous · Answer

what?

anonymous · Answer

$$\frac{ 9 }{ 2(x+28) } = \frac{ 9 }{ 2X+56 }$$

anonymous · Answer

9 = a *2(x + 28)

anonymous · Answer

then leave x on one side and the rest on the other side and that's how you solve for x, i think ?

anonymous · Answer

Why did you put ''a'' in their?? @kx2bay

anonymous · Answer

im still not understanding?

anonymous · Answer

i didnt

anonymous · Answer

thats part of the question

hero · Answer

$$A = \frac{9}{2(x + 28)}$$

anonymous · Answer

That's the same thing I just put?

hero · Answer

To solve for x, you have to isolate x

hero · Answer

I would first re-write it as

$$2(x + 28) = \frac{9}{A}$$

anonymous · Answer

so $$a=9 \over 2x+56?$$

hero · Answer

Then divide both sides by 2
Finally subtract 28 from both sides.

hero · Answer

@kryoWolf...no

anonymous · Answer

no?

anonymous · Answer

hmm

hero · Answer

I've never seen a fraction written with the equal sign in it.

anonymous · Answer

i didnt know how not to put it like that in the equation like that

anonymous · Answer

@Hero how would $$9 \over A$$ being divided by 2 look like?

anonymous · Answer

wait $$\frac{ x }{ 2 } +14=\frac{ 9 }{ A } \div 2?$$

hero · Answer

The 2 was already on the left side when you divided it out. You're misinterpreting what it means to divide that side by 2.

hero · Answer

The right side is correct.

anonymous · Answer

ok

hero · Answer

Here's what dividing both sides by 2 looks like:

$\dfrac{2(x + 28)}{2} = \dfrac{9}{2A}$

anonymous · Answer

so $$x=\frac{ 9 }{ A }\div2-28?$$

anonymous · Answer

oh

hero · Answer

The 2's cancel on the left leaving just:

$x + 28 = \dfrac{9}{2A}$

hero · Answer

Now subtract 28 from both sides to get:

$x = \dfrac{9}{2A} - 28$

anonymous · Answer

ok

hero · Answer

So now, let A = 135, then calculate the value of $x$

anonymous · Answer

thanks for the help but i gotta go