| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.60 |
| Score | 0% | 72% |
Simplify (9a)(7ab) - (9a2)(4b).
| -27ab2 | |
| 27a2b | |
| 99ab2 | |
| 208ab2 |
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.
(9a)(7ab) - (9a2)(4b)
(9 x 7)(a x a x b) - (9 x 4)(a2 x b)
(63)(a1+1 x b) - (36)(a2b)
63a2b - 36a2b
27a2b
Which types of triangles will always have at least two sides of equal length?
equilateral and right |
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equilateral and isosceles |
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isosceles and right |
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equilateral, isosceles and right |
An isosceles triangle has two sides of equal length. An equilateral triangle has three sides of equal length. In a right triangle, two sides meet at a right angle.
If angle a = 46° and angle b = 57° what is the length of angle c?
| 72° | |
| 87° | |
| 77° | |
| 65° |
The sum of the interior angles of a triangle is 180°:
180° = a° + b° + c°
c° = 180° - a° - b°
c° = 180° - 46° - 57° = 77°
A coordinate grid is composed of which of the following?
y-axis |
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x-axis |
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origin |
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all of these |
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.
What is 7a - 3a?
| 4a2 | |
| 4a | |
| a2 | |
| 21a2 |
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 - 3a = 4a