| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.28 |
| Score | 0% | 66% |
If a = c = 8, b = d = 1, what is the area of this rectangle?
| 30 | |
| 8 | |
| 16 | |
| 4 |
The area of a rectangle is equal to its length x width:
a = l x w
a = a x b
a = 8 x 1
a = 8
The formula for the area of a circle is which of the following?
a = π d2 |
|
a = π r2 |
|
a = π r |
|
a = π d |
The circumference of a circle is the distance around its perimeter and equals π (approx. 3.14159) x diameter: c = π d. The area of a circle is π x (radius)2 : a = π r2.
What is 8a7 - 2a7?
| 6a7 | |
| 6 | |
| 10a14 | |
| a714 |
To combine like terms, add or subtract the coefficients (the numbers that come before the variables) of terms that have the same variable raised to the same exponent.
8a7 - 2a7 = 6a7
A cylinder with a radius (r) and a height (h) has a surface area of:
2(π r2) + 2π rh |
|
π r2h |
|
4π r2 |
|
π r2h2 |
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.
Solve for x:
-5x + 4 = \( \frac{x}{4} \)
| 2\(\frac{2}{17}\) | |
| \(\frac{16}{21}\) | |
| -2\(\frac{13}{16}\) | |
| 4\(\frac{4}{11}\) |
To solve this equation, repeatedly do the same thing to both sides of the equation until the variable is isolated on one side of the equal sign and the answer on the other.
-5x + 4 = \( \frac{x}{4} \)
4 x (-5x + 4) = x
(4 x -5x) + (4 x 4) = x
-20x + 16 = x
-20x + 16 - x = 0
-20x - x = -16
-21x = -16
x = \( \frac{-16}{-21} \)
x = \(\frac{16}{21}\)