Melody

This doesn't make any sense

LHS=16

RHS=-4

Like Aziz said 16 is not equal to -4 

no it is 

(x+9)(x+9)=x(x+9)+9(x+9)

and you can finish it.

With your fingers and toes.  Everyone knows that.

Take off your shoes - it will be easier then!

Here is another site that will help

A linear equation is one that graphs to give a straight line. 

use the home page calc

70/10*179=

then subtract the answer from 179

Use the home page calc for this

3/5*55

I'm just thinking.

If f(x) is continuous in an open region does that mean it could be a relation that is not  a function.

Like a circle or an s shape?

Relations that are not functions are not differentiable either.  

Aziz,

2/3x and (2/3)x     are the same thing 

I think that you meant to say

I assume it should be (2/3)x and not 2/(3x)

I would usually call an exponent a power.