| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.13 |
| Score | 0% | 63% |
What is 6a7 + 4a7?
| 10a7 | |
| 10a14 | |
| a714 | |
| 24a14 |
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.
6a7 + 4a7 = 10a7
If side x = 11cm, side y = 8cm, and side z = 9cm what is the perimeter of this triangle?
| 22cm | |
| 21cm | |
| 27cm | |
| 28cm |
The perimeter of a triangle is the sum of the lengths of its sides:
p = x + y + z
p = 11cm + 8cm + 9cm = 28cm
The formula for the area of a circle is which of the following?
c = π r |
|
c = π d2 |
|
c = π d |
|
c = 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.
Solve -9a - 5a = -a + 4y + 2 for a in terms of y.
| 1\(\frac{1}{3}\)y + 1 | |
| 2y + 1 | |
| -1\(\frac{1}{8}\)y - \(\frac{1}{4}\) | |
| -\(\frac{1}{4}\)y - \(\frac{3}{4}\) |
To solve this equation, isolate the variable for which you are solving (a) on one side of the equation and put everything else on the other side.
-9a - 5y = -a + 4y + 2
-9a = -a + 4y + 2 + 5y
-9a + a = 4y + 2 + 5y
-8a = 9y + 2
a = \( \frac{9y + 2}{-8} \)
a = \( \frac{9y}{-8} \) + \( \frac{2}{-8} \)
a = -1\(\frac{1}{8}\)y - \(\frac{1}{4}\)
Which of the following is not a part of PEMDAS, the acronym for math order of operations?
exponents |
|
pairs |
|
division |
|
addition |
When solving an equation with two variables, replace the variables with the values given and then solve the now variable-free equation. (Remember order of operations, PEMDAS, Parentheses, Exponents, Multiplication/Division, Addition/Subtraction.)