Melody

there is no question here. 

Saseflower - Gradient is just the formal word for slope.   

You are making yourself indispensible to us saseflower.  I am most impressed with your contributions :)

just work them out backwards

$$\\x=7\\
5x=35\\
5x-3=32\\
So \\
5x-3=32\qquad $Is one example$$$

You set this out like an ordinary long division.

It is a bit hard for us to show you here.

If you google  "algebraic division" or "algebraic long division " or "synthetic division"

there are a lot of sites that will show you how to do it.

There are also a number of you tube clips that will show you exactly what to do.  They are very good. :)

Here is one example that I did for someone else. :)

I am not sure if I am answering your question but

0.2858 = sin theta 2

$$\\0.2858 = sin (\theta_2)\\\\
\theta_2=asin(0.2858)$$

$$\underset{\,\,\,\,^{\textcolor[rgb]{0.66,0.66,0.66}{360^\circ}}}{{sin}}^{\!\!\mathtt{-1}}{\left({\mathtt{0.285\: \!8}}\right)} = {\mathtt{16.606\: \!674\: \!357\: \!671^{\circ}}}$$

what is arcsin(-square root of 2 divided by 2) =

Well you could do it on a calculator.

or

arcsin is only defined for  [-pi/2, +pi/2]

It is negative so the angle will be between  -pi/2 and 0

Now I am just going to look at 

$$\\sin\theta=+\frac{\sqrt2}{2}=+\frac{1}{\sqrt2}\\\\
\theta =\frac{ \pi}{4}\\\\
so\\\\
asin\;\frac{-\sqrt2}{2}=\frac{ -\pi}{4}$$

yes  you are right. :)

FV=20000*(1+0.05)^7

$${\mathtt{20\,000}}{\mathtt{\,\times\,}}{\left({\mathtt{1}}{\mathtt{\,\small\textbf+\,}}{\mathtt{0.05}}\right)}^{{\mathtt{7}}} = {\mathtt{28\,142.008\: \!453\: \!125}}$$

okay - I didn't actually look