| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.50 |
| Score | 0% | 70% |
The dimensions of this cube are height (h) = 2, length (l) = 7, and width (w) = 5. What is the surface area?
| 154 | |
| 342 | |
| 118 | |
| 136 |
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 7 x 5) + (2 x 5 x 2) + (2 x 7 x 2)
sa = (70) + (20) + (28)
sa = 118
Which of the following statements about a triangle is not true?
perimeter = sum of side lengths |
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area = ½bh |
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sum of interior angles = 180° |
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exterior angle = sum of two adjacent interior angles |
A triangle is a three-sided polygon. It has three interior angles that add up to 180° (a + b + c = 180°). An exterior angle of a triangle is equal to the sum of the two interior angles that are opposite (d = b + c). The perimeter of a triangle is equal to the sum of the lengths of its three sides, the height of a triangle is equal to the length from the base to the opposite vertex (angle) and the area equals one-half triangle base x height: a = ½ base x height.
What is the area of a circle with a radius of 4?
| 16π | |
| 4π | |
| 2π | |
| 9π |
The formula for area is πr2:
a = πr2
a = π(42)
a = 16π
What is 7a + 4a?
| 28a | |
| 28a2 | |
| 11a | |
| 3 |
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.
7a + 4a = 11a
Which of the following is not a part of PEMDAS, the acronym for math order of operations?
addition |
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pairs |
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division |
|
exponents |
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.)