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Not quite Eloise     

2.1% of 1,500   

$$\frac{2.1}{100}*1500$$     

=2.1*15      

=31.5

You should also do a sensibleness check

1% 0f 1500 is 15

2% of 1500 is 30

2.1% must be a bit more than that    

The discount is asked for as a percentage of the normal price, not of the number of erasers!

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To understand the volume and the surface area of 3D shapes it is essentual that you understand the area of 2D shapes first.

You see, to find the surface area of 3D shapes you just add up the areas of all the sides.

To find the volume of any prism you just find the area of the side that stays the same all the way through and then multiply it by the depth.    (some people call the depth the height, it doesn't matter what you call it, if you UNDERSTAND what you are doing then the different names will not confuse you.)

The bottom clip on this post covered volume of prisms.  

To answer your question.

I'm mainly talking about 3D Shapes.

To answer your question.

I'm mainly talking about 3D Shapes.

A 100% increase doubles it

A 200% increase triples it

A 300% increase quadruples it.......

N (N + 1)  / 2

2.1% of 1,500

=2.1%*1,500

=2.1%*1.5

=63/2000

=0.0315

Yes, you are correct. Because,

Normal Price = $9

Bulk Price = $8

Discount% = ($9 - $8)/10 (Erasers) *100

                    = 1/10 *100

                    = 10%.

852852480.50

=8.528524805*10

$$\\6*6=6^2\\
8*8=8^2\\
L*L=L^2\\$$

That is what squared means 

Hi MG

ALL THE SYMBOLS THAT I USE HAVE A PURPOSE.   

Do you mean this line

$$\mathbf{If\quad L^2=9\qquad then\; \; L=\sqrt{9} = 3cm}$$

rectangle

Area = Length*Breadth

A square is just a special rectangle where     length=  breadth    So

Area of a square = L*L

but L*L can be written as     $$L^2$$

So with the little rectangle 

$$\mathbf{If\quad L^2=9\qquad then\; \; L=\sqrt{9} = 3cm}$$

This is because the inverse of square is square root.

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Isn't this area stuff a part of what you mean by shapes?

I didn't have any luck with the on-site calculator in trying to calculate the radius.......it will give me the volume for a particular radius, but not vice-versa

So.......

1410000000  = (4/3)pi * r^3     

(1410000000 )/ (4pi/3)  = r^3      take the cube root of both sides

r = about 695.6 kilometers

Ok!

I get i, but whats the point of the square sign or is it just a math rule?

I remember learning this but I needed a recap, I will watch the video.

Also I'm having a huge problem with the ones i said on the post above.

Especially Shapes.

The basic series expansion for log to the base e (so called natural logarithms) is

log(1 + x) = x - x^2/2 + x^3/3 - x^4/4 + ...

That works providing that x lies within the range minus 1 to plus 1, but excluding minus 1.

There are a number of ways in which the series can be used in order to extend the range, and a change of base formula can be used to produce base 10 tables.

$${\frac{{\mathtt{25}}{\mathtt{\,\times\,}}{\mathtt{b}}}{\left({\mathtt{5}}{\mathtt{\,\times\,}}{\mathtt{bc}}\right)}} = {\frac{{\mathtt{5}}}{{\mathtt{c}}}} = {\mathtt{5}}{\mathtt{\,\times\,}}{{\mathtt{c}}}^{-{\mathtt{1}}}$$

It's a limiting thing, but I suppose that you could argue that x = 0 is a solution.

x*18% = 144.15

x*18/100=144.15     =>     x = 144.15*100/18

  x  =  $${\frac{{\mathtt{144.15}}{\mathtt{\,\times\,}}{\mathtt{100}}}{{\mathtt{18}}}} = {\frac{{\mathtt{4\,805}}}{{\mathtt{6}}}} = {\mathtt{800.833\: \!333\: \!333\: \!333\: \!333\: \!3}}$$

Good thinking civonamzuk!

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Take log₁₀ of both sides to get

-3 + x = log₁₀(300)

-3 + x = log₁₀(3) + log₁₀(100)

-3 + x = log₁₀(3) + 2

x = log₁₀(3) + 5

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Thanks Alan. And you too Anonymous.

(a) and (b) are correct.

For (c), if the "normal" price is that of 10 individual erasers (namely, $9) then the discount ($1) as a percentage  of the normal price is given by (1/9)*100, or ≈ 11%

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(x^2-7*x-11)/(x-8)

=x^2-7x-11/x-8

25b/5bc

=25*b/5*bc

=5*b*bc

=5b^2c