| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.33 |
| Score | 0% | 67% |
If b = -2 and z = 3, what is the value of 7b(b - z)?
| -288 | |
| 144 | |
| 70 | |
| 112 |
To solve this equation, replace the variables with the values given and then solve the now variable-free equation. (Remember order of operations, PEMDAS, Parentheses, Exponents, Multiplication/Division, Addition/Subtraction.)
7b(b - z)
7(-2)(-2 - 3)
7(-2)(-5)
(-14)(-5)
70
Which of the following is not a part of PEMDAS, the acronym for math order of operations?
addition |
|
exponents |
|
pairs |
|
division |
When solving an equation with two variables, replace the variables with the values given and then solve the now variable-free equation. (Remember order of operations, PEMDAS, Parentheses, Exponents, Multiplication/Division, Addition/Subtraction.)
A cylinder with a radius (r) and a height (h) has a surface area of:
2(π r2) + 2π rh |
|
π r2h2 |
|
4π r2 |
|
π r2h |
A cylinder is a solid figure with straight parallel sides and a circular or oval cross section with a radius (r) and a height (h). The volume of a cylinder is π r2h and the surface area is 2(π r2) + 2π rh.
What is the area of a circle with a radius of 5?
| 16π | |
| 49π | |
| 25π | |
| 6π |
The formula for area is πr2:
a = πr2
a = π(52)
a = 25π
The dimensions of this cube are height (h) = 9, length (l) = 5, and width (w) = 4. What is the surface area?
| 202 | |
| 210 | |
| 46 | |
| 22 |
The surface area of a cube is (2 x length x width) + (2 x width x height) + (2 x length x height):
sa = 2lw + 2wh + 2lh
sa = (2 x 5 x 4) + (2 x 4 x 9) + (2 x 5 x 9)
sa = (40) + (72) + (90)
sa = 202