Solve the problem.Ozone levels inside a building should not exceed 50 parts per billion (ppb). In a scientific study, an air filter was able to remove 44% of the ozone entering a building. Approximate the range of ozone concentrations in outside air that this filter will reduce to an acceptable level.
A. 71 ppb ? x ? 89 ppb
B. x ? 89 ppb
C. x ? 89 ppb
D. x ? 107 ppb
Answer: C
Mathematics
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Use a calculator to find the value of y in degrees rounded to two decimal places.y = tan-1 0.4555
A. 24.49° B. 26.49° C. 29.49° D. 19.49°
Mathematics
Provide an appropriate response.Explain why the vertex of a parabola must lie on its axis.
What will be an ideal response?
Mathematics
Add or subtract as indicated. Make sure that your answer is reasonable by estimating first.7.75 + 4.959
A. 2.791 B. -2.791 C. 12.809 D. 12.709
Mathematics
Determine the real solutions to the system of nonlinear equations.y2 + 2x2 = 28y2 - x2 = 1
A. (4, 
), (4, -
)
B. (3, 
), (3, -
), (-3, 
), (-3, -
)
C. (3, 
), (3, -
)
D. (4, 
), (4, -
), (-4, 
), (-4, -
)
Mathematics