| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.40 |
| Score | 0% | 68% |
What is 7a9 - 7a9?
| 0a9 | |
| 18 | |
| 49a9 | |
| 14a18 |
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.
7a9 - 7a9 = 0a9
What is the circumference of a circle with a radius of 14?
| 10π | |
| 19π | |
| 20π | |
| 28π |
The formula for circumference is circle diameter x π. Circle diameter is 2 x radius:
c = πd
c = π(2 * r)
c = π(2 * 14)
c = 28π
If side x = 7cm, side y = 8cm, and side z = 13cm what is the perimeter of this triangle?
| 34cm | |
| 37cm | |
| 32cm | |
| 28cm |
The perimeter of a triangle is the sum of the lengths of its sides:
p = x + y + z
p = 7cm + 8cm + 13cm = 28cm
Simplify (8a)(5ab) - (4a2)(9b).
| 76ab2 | |
| 4a2b | |
| 169a2b | |
| 169ab2 |
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.
(8a)(5ab) - (4a2)(9b)
(8 x 5)(a x a x b) - (4 x 9)(a2 x b)
(40)(a1+1 x b) - (36)(a2b)
40a2b - 36a2b
4a2b
The dimensions of this cube are height (h) = 6, length (l) = 3, and width (w) = 5. What is the surface area?
| 192 | |
| 256 | |
| 146 | |
| 126 |
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 3 x 5) + (2 x 5 x 6) + (2 x 3 x 6)
sa = (30) + (60) + (36)
sa = 126