| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.43 |
| Score | 0% | 69% |
What is the area of a circle with a diameter of 10?
| 5π | |
| 49π | |
| 7π | |
| 25π |
The formula for area is πr2. Radius is circle \( \frac{diameter}{2} \):
r = \( \frac{d}{2} \)
r = \( \frac{10}{2} \)
r = 5
a = πr2
a = π(52)
a = 25π
Simplify (9a)(5ab) + (2a2)(6b).
| 57a2b | |
| 33a2b | |
| 33ab2 | |
| 112ab2 |
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)(5ab) + (2a2)(6b)
(9 x 5)(a x a x b) + (2 x 6)(a2 x b)
(45)(a1+1 x b) + (12)(a2b)
45a2b + 12a2b
57a2b
What is the circumference of a circle with a diameter of 2?
| 8π | |
| 15π | |
| 17π | |
| 2π |
The formula for circumference is circle diameter x π:
c = πd
c = 2π
The dimensions of this cylinder are height (h) = 8 and radius (r) = 2. What is the volume?
| 3π | |
| 81π | |
| 32π | |
| 320π |
The volume of a cylinder is πr2h:
v = πr2h
v = π(22 x 8)
v = 32π
If AD = 24 and BD = 20, AB = ?
| 18 | |
| 6 | |
| 20 | |
| 4 |
The entire length of this line is represented by AD which is AB + BD:
AD = AB + BD
Solving for AB:AB = AD - BD