| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.50 |
| Score | 0% | 70% |
If angle a = 37° and angle b = 49° what is the length of angle c?
| 94° | |
| 66° | |
| 52° | |
| 126° |
The sum of the interior angles of a triangle is 180°:
180° = a° + b° + c°
c° = 180° - a° - b°
c° = 180° - 37° - 49° = 94°
If b = 1 and y = 3, what is the value of -b(b - y)?
| 165 | |
| 2 | |
| -810 | |
| 360 |
To solve this equation, 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.)
-b(b - y)
-1(1)(1 - 3)
-1(1)(-2)
(-1)(-2)
2
Which of the following statements about math operations is incorrect?
you can add monomials that have the same variable and the same exponent |
|
you can subtract monomials that have the same variable and the same exponent |
|
you can multiply monomials that have different variables and different exponents |
|
all of these statements are correct |
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.
Solve for c:
-3c + 1 = 6 + 2c
| -2 | |
| 1 | |
| -1 | |
| -1\(\frac{1}{3}\) |
To solve this equation, repeatedly do the same thing to both sides of the equation until the variable is isolated on one side of the equal sign and the answer on the other.
-3c + 1 = 6 + 2c
-3c = 6 + 2c - 1
-3c - 2c = 6 - 1
-5c = 5
c = \( \frac{5}{-5} \)
c = -1
If side x = 15cm, side y = 5cm, and side z = 11cm what is the perimeter of this triangle?
| 25cm | |
| 28cm | |
| 35cm | |
| 31cm |
The perimeter of a triangle is the sum of the lengths of its sides:
p = x + y + z
p = 15cm + 5cm + 11cm = 31cm