| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.71 |
| Score | 0% | 74% |
A quadrilateral is a shape with __________ sides.
2 |
|
3 |
|
4 |
|
5 |
A quadrilateral is a shape with four sides. The perimeter of a quadrilateral is the sum of the lengths of its four sides.
What is the circumference of a circle with a diameter of 15?
| 26π | |
| 15π | |
| 18π | |
| 8π |
The formula for circumference is circle diameter x π:
c = πd
c = 15π
Which of the following statements about math operations is incorrect?
you can add monomials that have the same variable and the same exponent |
|
all of these statements are correct |
|
you can subtract monomials that have the same variable and the same exponent |
|
you can multiply monomials that have different variables and different exponents |
You can only add or subtract monomials that have the same variable and the same exponent. For example, 2a + 4a = 6a and 4a2 - a2 = 3a2 but 2a + 4b and 7a - 3b cannot be combined. However, you can multiply and divide monomials with unlike terms. For example, 2a x 6b = 12ab.
If side x = 8cm, side y = 14cm, and side z = 8cm what is the perimeter of this triangle?
| 30cm | |
| 32cm | |
| 29cm | |
| 22cm |
The perimeter of a triangle is the sum of the lengths of its sides:
p = x + y + z
p = 8cm + 14cm + 8cm = 30cm
Simplify (4a)(4ab) - (9a2)(6b).
| 70a2b | |
| 38ab2 | |
| 70ab2 | |
| -38a2b |
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.
(4a)(4ab) - (9a2)(6b)
(4 x 4)(a x a x b) - (9 x 6)(a2 x b)
(16)(a1+1 x b) - (54)(a2b)
16a2b - 54a2b
-38a2b