| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.83 |
| Score | 0% | 77% |
If a = 2, b = 9, c = 4, and d = 4, what is the perimeter of this quadrilateral?
| 19 | |
| 18 | |
| 29 | |
| 21 |
Perimeter is equal to the sum of the four sides:
p = a + b + c + d
p = 2 + 9 + 4 + 4
p = 19
If a = -7 and x = -6, what is the value of -8a(a - x)?
| -385 | |
| -56 | |
| -416 | |
| -324 |
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.)
-8a(a - x)
-8(-7)(-7 + 6)
-8(-7)(-1)
(56)(-1)
-56
What is 5a + 8a?
| -3 | |
| 13 | |
| -3a2 | |
| 13a |
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.
5a + 8a = 13a
Which of the following is not true about both rectangles and squares?
all interior angles are right angles |
|
the area is length x width |
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the lengths of all sides are equal |
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the perimeter is the sum of the lengths of all four sides |
A rectangle is a parallelogram containing four right angles. Opposite sides (a = c, b = d) are equal and the perimeter is the sum of the lengths of all sides (a + b + c + d) or, comonly, 2 x length x width. The area of a rectangle is length x width. A square is a rectangle with four equal length sides. The perimeter of a square is 4 x length of one side (4s) and the area is the length of one side squared (s2).
Which of the following expressions contains exactly two terms?
binomial |
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monomial |
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polynomial |
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quadratic |
A monomial contains one term, a binomial contains two terms, and a polynomial contains more than two terms.