**Answer:**

15x^2 - 12x^3

**Step-by-step explanation:**

A rectangular block has 3 parts that play into its volume. length, width and height. The question gives us length and width in the form of x and 3x, so height is what's missing.

It gives us a bit more information saying the sum of its edges is 20. We also have to ask how many lengths, widths and heights are there. That may be a bit hard to understand, but is you are looking at a block I could ask how many edges are vertical, just going up and down. These would be the heights. There are 4 total, and this goes the same for length and width, so 4*length + 4*width and 4*height = 20.

Taking that and plugging in x for length and 3x for width (or you could do it the other way around, it doesn't matter, you get:

4*x + 4*3x + 4*height = 20

4x + 12x + 4h = 20

16x + 4h = 20

4h = 20 - 16x

h = 5 - 4x

Now we have h in terms of x, which lets us easily find the volume just knowing x. To find the volume of a rectangular block you just multiply the length, width and height.

x*3x*(5-4x)

3x^2(5-4x)

15x^2 - 12x^3

Question doesn't give a specific value for x at all so you should be done there. Any number you plug in for x should get you the right answer

I find the following data for the concept **GPA**:

Your GPA is calculated in two steps:

The grade awarded for each course is multiplied by the credit value for each course.

The aggregate score is divided by the total number of credits for all courses completed in the defined period of study.

So, the weighted average reflects the relative contribution made by all the courses you have undertaken based on their credit value.

From the above data, the correct option for the **answer** is **d. weighted average.**

Yes. See your smart . Answer is 180.

**Answer:**

i would need some options ( :

**Step-by-step explanation:**