Simplify.5(-4) + (-10)(-2)
A. 40
B. -40
C. 20
D. 0
Answer: D
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Find the Cartesian coordinates of the given point.
A. (10, 10)
B. (10
, 10
)
C. (5
, 5
)
D. (5
, 5)
Determine if the parabola whose equation is given opens upward or downward.y = x2 - 3x - 9
A. downward B. upward
Solve the problem.A certain electronic air cleaner is capable of filtering x liters of air per second and the percentage of the contaminants that are removed from the air may be calculated by 
where 
Graph f in [0,85,5] by 
Then, use the intersection-of-graphs method to estimate the x-values where 75% to 95% of the pollutants are removed.
height="180" width="180" />
A. 75% to 95% are removed when
about 36 to 47 liters of air are
filtered.
B. 75% to 95% are removed when
about 25 to 33 liters of air are
filtered.
C. 75% to 95% are removed when
about 45 to 56 liters of air are
filtered.
D. 75% to 95% are removed when
about 27 to 36 liters of air are
filtered.
Simplify the expression.
?
?
Write your answer without using negative exponents.
What will be an ideal response?