# math

#### jpg

##### New member

can you help me with exercais 2

#### Dr.Peterson

##### Elite Member
View attachment 24299
can you help me with exercais 2
Sure. But in order to help, we'll need to see the entire problem as given to you, and some information to help us see what help you need (such as whatever work you've tried, or a specific question about it.

I don't know what "inner and outer rays of comma" means, so you'll have to tell us.

#### lookagain

##### Elite Member
jpg, to finish the first problem, you need another line/step/description where you
write $$\displaystyle \ "cm^3" \ \ or \ \ "cubic \ \ centimeters" \$$ after $$\displaystyle \ 126 \ \pi^2$$.

Last edited:

#### Otis

##### Elite Member
can you help …
Hi jpg. I can't help with finishing the exercise, yet, because the exercise statement is missing. However, I'd like to comment on your simplification steps in part 1, starting with $$v = \frac{14 \pi^2 \cdot 6^2}{4}$$.

When simplifying a rational expression containing squares of constants, go ahead and square the constant right away. Doing that could eliminate several of your steps because it allows reducing the ratio to lowest terms up front.

$$\displaystyle v = \frac{14 \pi^2 \cdot 36}{4}$$

$$\displaystyle v = \frac{14 \pi^2 \cdot \cancel{36}^9}{_1\cancel{4}}$$

$$\displaystyle v = 126 \pi^2 \; \text{cm}^3$$

jpg