| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.49 |
| Score | 0% | 70% |
What is 5a - 7a?
| 35a | |
| -2a | |
| -2 | |
| 12a2 |
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.
5a - 7a = -2a
The formula for the area of a circle is which of the following?
a = π d |
|
a = π r |
|
a = π d2 |
|
a = π r2 |
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.
The dimensions of this trapezoid are a = 6, b = 8, c = 7, d = 9, and h = 4. What is the area?
| 22 | |
| 12 | |
| 25\(\frac{1}{2}\) | |
| 34 |
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 + 9)(4)
a = ½(17)(4)
a = ½(68) = \( \frac{68}{2} \)
a = 34
If a = 9 and x = -9, what is the value of 5a(a - x)?
| -330 | |
| -30 | |
| 462 | |
| 810 |
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.)
5a(a - x)
5(9)(9 + 9)
5(9)(18)
(45)(18)
810
If angle a = 62° and angle b = 25° what is the length of angle c?
| 108° | |
| 93° | |
| 103° | |
| 70° |
The sum of the interior angles of a triangle is 180°:
180° = a° + b° + c°
c° = 180° - a° - b°
c° = 180° - 62° - 25° = 93°