NinjaDevo

Just an fyi Melody, it did say to use 3.14 for pi. :)

It's a good thing to remember though, I remember you pointing the same thing out to me and now I won't forget it!

You can just do it on the website's calculator....

Here's what the calc. got:

I added that log question to the new answers page.

Also, by the way, I see you've gotten a new profile picture. Is that Lady Guinevere...or....whatever she's called?

What? Where's the justice?! We can't have rosala's points being unfairly taken away!

I gave you a thumbs on on those posts rosala. Hope this helps.

Liked the pics too. How do you find these anyway?

Well, the formula to find the volume of a sphere is  V = ⁴⁄₃(pi)*r³

The radius would be half of the diameter, so radius = 45/2 = 22.5

Now we have

V = 4/3(pi)*22.5³

V=4/3(pi)*11390.625

v = 4/3*11390.625*(pi)

V = 15187.5(pi)

$${\mathtt{15\,187.5}}{cm}{\mathtt{\,\times\,}}{\mathtt{\pi}} = {\mathtt{47\,712.938\: \!426\: \!394\: \!984\: \!809\: \!2}}{cm}$$

Or, rounded to the nearest whole number:

47,713 cm³

You have to use the

First

Outside

Inside

Last

method.

5a*5a = 25a²          ---First

5a*5 = 25a        ---Outside

5*5a = 25a           ---Inside

5*5 = 25              ---Last

And now you add all these up for your answer.

25a² +25a + 25a+ 25

25a² + 50a + 25

And there you go, that's your answer.

Yup, rosala is right, you have to remember your order of operations.

Here's the order of operations:

Parentheses

Exponets

Multiplication 

Division

Addition

Subtraction

This is a saying people like to think of when doing the order of operations - "PEMDAS".

It basically says...

First you do anything in parenthesis.

Then you do anything with exponets.

Next you do either multiplication or division, based on the order it comes in the question. 

Here's an example:

8*8 ÷ 4           ---First you do 8*8 because it comes first

64 ÷ 4             ---Now you divide 64 by 4.

After you do multiplication and division, you do addition and subtraction, based on the order they come in the question, just like multiplication and division.

So let's apply this to your question:

2+5*3-2           ---We have to do multiplication (5*3) before addition and subtraction based on the order of operations

2+15-2

17-2

15

There you go, hope this clears it up for you. :)

A trapezoid is a 4-sided geometric shape with atleast 2 parallel sides.

Here's a couple pictures of different trapezoids.