| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.32 |
| Score | 0% | 66% |
What is the area of a circle with a radius of 2?
| 3π | |
| 81π | |
| 4π | |
| 8π |
The formula for area is πr2:
a = πr2
a = π(22)
a = 4π
Find the value of c:
-6c + x = 7
-5c - 6x = -4
| -3\(\frac{1}{2}\) | |
| -\(\frac{38}{41}\) | |
| \(\frac{5}{12}\) | |
| -1\(\frac{9}{23}\) |
You need to find the value of c so solve the first equation in terms of x:
-6c + x = 7
x = 7 + 6c
then substitute the result (7 - -6c) into the second equation:
-5c - 6(7 + 6c) = -4
-5c + (-6 x 7) + (-6 x 6c) = -4
-5c - 42 - 36c = -4
-5c - 36c = -4 + 42
-41c = 38
c = \( \frac{38}{-41} \)
c = -\(\frac{38}{41}\)
Simplify (5a)(4ab) + (3a2)(7b).
| 90a2b | |
| a2b | |
| ab2 | |
| 41a2b |
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.
(5a)(4ab) + (3a2)(7b)
(5 x 4)(a x a x b) + (3 x 7)(a2 x b)
(20)(a1+1 x b) + (21)(a2b)
20a2b + 21a2b
41a2b
What is the circumference of a circle with a diameter of 8?
| 2π | |
| 8π | |
| 28π | |
| 19π |
The formula for circumference is circle diameter x π:
c = πd
c = 8π
To multiply binomials, use the FOIL method. Which of the following is not a part of the FOIL method?
Odd |
|
Last |
|
First |
|
Inside |
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.