| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.82 |
| Score | 0% | 76% |
If c = -7 and z = -5, what is the value of 2c(c - z)?
| 28 | |
| 27 | |
| 648 | |
| 288 |
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.)
2c(c - z)
2(-7)(-7 + 5)
2(-7)(-2)
(-14)(-2)
28
The dimensions of this trapezoid are a = 4, b = 8, c = 6, d = 5, and h = 2. What is the area?
| 13 | |
| 7\(\frac{1}{2}\) | |
| 21 | |
| 10 |
The area of a trapezoid is one-half the sum of the lengths of the parallel sides multiplied by the height:
a = ½(b + d)(h)
a = ½(8 + 5)(2)
a = ½(13)(2)
a = ½(26) = \( \frac{26}{2} \)
a = 13
A coordinate grid is composed of which of the following?
x-axis |
|
all of these |
|
origin |
|
y-axis |
The coordinate grid is composed of a horizontal x-axis and a vertical y-axis. The center of the grid, where the x-axis and y-axis meet, is called the origin.
Simplify 2a x 7b.
| 14\( \frac{b}{a} \) | |
| 14ab | |
| 14a2b2 | |
| 9ab |
To multiply monomials, multiply the coefficients (the numbers that come before the variables) of each term, add the exponents of like variables, and multiply the different variables together.
2a x 7b = (2 x 7) (a x b) = 14ab
What is 4a + 6a?
| -2a2 | |
| 10a | |
| -2 | |
| a2 |
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.
4a + 6a = 10a