| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.62 |
| Score | 0% | 72% |
The formula for the area of a circle is which of the following?
a = π r |
|
a = π d2 |
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a = π d |
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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.
Simplify (9a)(7ab) - (8a2)(8b).
| -1a2b | |
| 127a2b | |
| 256ab2 | |
| 127ab2 |
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) - (8a2)(8b)
(9 x 7)(a x a x b) - (8 x 8)(a2 x b)
(63)(a1+1 x b) - (64)(a2b)
63a2b - 64a2b
-1a2b
What is the area of a circle with a radius of 5?
| 25π | |
| 36π | |
| 16π | |
| 3π |
The formula for area is πr2:
a = πr2
a = π(52)
a = 25π
If angle a = 20° and angle b = 38° what is the length of angle c?
| 122° | |
| 98° | |
| 102° | |
| 120° |
The sum of the interior angles of a triangle is 180°:
180° = a° + b° + c°
c° = 180° - a° - b°
c° = 180° - 20° - 38° = 122°
To multiply binomials, use the FOIL method. Which of the following is not a part of the FOIL method?
Odd |
|
Inside |
|
First |
|
Last |
To multiply binomials, use the FOIL method. FOIL stands for First, Outside, Inside, Last and refers to the position of each term in the parentheses.