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 49% 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. At most 118 ppb
B. At most 98 ppb
C. between 78 and 98 ppb
D. At least 98 ppb
Answer: B
Mathematics
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Identify the vertex of the quadratic equation.f(x) = x2 - 7
A. (0, -7) B. (7, 0) C. (1, 0) D. (0, 7)
Mathematics
Solve the system of nonlinear equations using the method you prefer.
A. (-2, -3), (-3, -2) B. (-2, 3), (-3, 2) C. (2, 3), (3, 2) D. (2, -3), (3, -2)
Mathematics
Solve the radical equation. Check all proposed solutions.
+ 6 = x + 2
A. x = -4, 
B. x = 8
C. x = -4
D. x = 2, 8
Mathematics
Use a formula to solve the problem.A rectangular Persian carpet has a perimeter of 184 inches. The length of the carpet is 20 inches more than the width. What are the dimensions of the carpet?
A. 36 inches by 56 inches B. 82 inches by 102 inches C. 72 inches by 92 inches D. 56 inches by 76 inches
Mathematics