| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.56 |
| Score | 0% | 71% |
What is 4a - 3a?
| 12a | |
| 1a | |
| 12a2 | |
| a2 |
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.
4a - 3a = 1a
If a = c = 2, b = d = 9, what is the area of this rectangle?
| 45 | |
| 18 | |
| 56 | |
| 20 |
The area of a rectangle is equal to its length x width:
a = l x w
a = a x b
a = 2 x 9
a = 18
What is the area of a circle with a radius of 3?
| 36π | |
| 9π | |
| 6π | |
| 8π |
The formula for area is πr2:
a = πr2
a = π(32)
a = 9π
If angle a = 29° and angle b = 66° what is the length of angle d?
| 157° | |
| 140° | |
| 151° | |
| 135° |
An exterior angle of a triangle is equal to the sum of the two interior angles that are opposite:
d° = b° + c°
To find angle c, remember that the sum of the interior angles of a triangle is 180°:
180° = a° + b° + c°
c° = 180° - a° - b°
c° = 180° - 29° - 66° = 85°
So, d° = 66° + 85° = 151°
A shortcut to get this answer is to remember that angles around a line add up to 180°:
a° + d° = 180°
d° = 180° - a°
d° = 180° - 29° = 151°
Which of the following statements about math operations is incorrect?
all of these statements are correct |
|
you can multiply monomials that have different variables and different exponents |
|
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 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.