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f(x)= (9(6)-1) - (9(2)-1)=53-17 = 36

Mmm

120mg

after one full day 60mg      {this is the end of the first day and the beginning of the second

So there will be 60mg left    

Both answers were good answers - do not be ungracious!

If you need more help ask for it politely!!

d/dx of cos (5x)=-5sin(5x)

Thank you!

>> Does 16 go into 128?

The answer is obtained by: 128 (division sign) 16

If the answer is a whole number, then 16 goes into 128 exactly!

a = lw

For a rectangular airport runway, as you described, the formula for area is "area equals length times width".

We already have the length and the width, so we can fill those is:

1/2 = 3/4w

Now we divide both sides by 3/4 to find w and isolate the variable:

1/2 ÷ 3/4 = w

To divide fractions, just multiple by the recipricol (numerator and denominator flip):

1/2 * 4/3 = w

To multiply, multiply the numerator and denominator of each:

1 * 4 = 4

2 * 3 = 6

So, 1/2 * 4/3 = 4/6 = 2/3 = w (width)

Im look for a good answer!

 $$\left({\frac{{\mathtt{3}}}{{\mathtt{4}}}}\right){\mathtt{\,\times\,}}{\mathtt{w}} = {\frac{{\mathtt{1}}}{{\mathtt{2}}}}$$

Now, re-arrange this to have w on one side by itself.

8 - (-32)

When you subtract a negative a negative number, it is actually addition because the two negatives nullify each other.

So:

8 - (-32)

Can be converted to:

8 + 32

Which is 40, as Anon said.

It is the same as (x^2 - 9).  It is called a, "difference of perfect squares. The answer is: (x + 3)(x - 3).

Convert all fractions to a common denominator. Here we need a denominator which is a multiple of 2, 4, and 4. So 4 sounds like a good choice of common denominator.

$${\frac{{\mathtt{2}}}{{\mathtt{4}}}} = {\frac{{\mathtt{1}}}{{\mathtt{4}}}}{\mathtt{\,\small\textbf+\,}}{\frac{{\mathtt{5}}}{{\mathtt{4}}}}{\mathtt{\,\times\,}}{\mathtt{x}}$$

This is a trigonometry question. It is rare for a teacher to ask such a question. It can be figured out using trig functions, namely tangent.

Here are some examples: The slope for 0 degrees is 0. For 30 degrees, slope = .5774. For 45 degrees, slope = 1. For 60 degrees, slope = 1.7321. For 90 degrees, slope = undefined (infinity).

You should memorize 0, 45, and 90 degrees.

Good luck!

5/9+n≤9/5

just subtract 5/9 from both sides  

Good suggestion JD  

'Pretax Rate Of Return' The rate of return on an investment that does not take the taxes the investor must pay on this return. I'm pretty sure that the 'of return' and amount are the same but that you might want to look further into. 😅

WHY is that the answer?

You can estimate it like anon did but it cannot be simplified because no square numbers go into it.

You can not find the square root of a negative numer in the real number system.

Nothing times itself = a negative number.

So there is NO REAL solution

--------------------

In the imaginary number system the answer is

 $$\sqrt{20}i\;=\;2\sqrt5\; i$$

12.85!!!! just round the awnser

You can think of negative numbers as cold numbers and positive numbers as hot numbers.

1.875- (-1.625)

If you take away cold from a room then the room will get hotter.   So - - = +

=1.875+ 1.625

The answer is 1

It is 50,000 M

This is a difference of 2 squares

x^2    and    2^2

$$(x^2-2^2)=(x-2)(x+2)$$

Basically algebra is where you use letters (pronumerals ) in place of numbers.  

You use numbers as well.

----------------------------------------------------------------------

for example

In primary school you might have a problems like

$$3+\fbox{\begin{minipage}{0.6cm}\hfill\vspace{0.6cm}\end{minipage}} =75\\\\$$

You would have to work out the answer which is 72 and write 72 in the box.

or if the box  was too little to write in maybe you could say  $$\fbox{\begin{minipage}{0.2cm}\hfill\vspace{0.2cm}\end{minipage}} =72$$

In high school you will use letters (pronumerals) instead of boxes.

So the question might be

3+Y=75

and the answer is  Y=72