Melody

Remember order of operation

PEDMAS

Parenthesis, exponents, (division and multiplication) (addition and subtraction)

The exponent ^ must be done before the multiplication *

$$\\\pi*3^2\\
=\pi*9\\
=9\pi\\
\approx 28.27$$

$$7 \frac{1}{6} + 4 \frac{2}{3}\\\\
=11 \frac{1}{6} + \frac{2}{3}\\\\
=11 \frac{1}{6} + \frac{4}{6}\\\\
=11 \frac{5}{6} \\\\$$

A tangent is a line that just touches the curve (function) at a particular point.

A function is said to be increasing at a particular x value if the gradient of the tangent at that point is positive.

A function is said to be decreasing at a particular x value if the gradient of the tangent at that point is negative.

for example 

The red curve is the function that I want to refer to 

The blue tangent has a positive gradient and the green tangent has a negative gradient.

All tangents on the curve where x>1 will have a positive gradients so here the function is increasing.

All tangents on the curve where x<1 will have a negative gradients so here the function is decreasing.

This is true Alan but very few people on this forum have heard of complex numbers.   

What is a special right triangle?  This means nothing to me.  Sorry.  

Please use the web2 calc on the home page.   

$$\\-3/2^2+8(-3/2)\\
=-3/4+4*-3\\
=-3/4-12\\
=-(3/4+12)\\
=-12\frac{3}{4}$$

You have not asked us a question so we cannot help you.  

$${\frac{{\mathtt{48}}}{{{\mathtt{4}}}^{{\mathtt{2}}}}}{\mathtt{\,\small\textbf+\,}}{\frac{{\mathtt{3}}}{{\mathtt{5}}}} = {\frac{{\mathtt{18}}}{{\mathtt{5}}}} = {\mathtt{3.6}}$$

This does not make sense, Sorry.