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 37% 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 79 ppb
B. between 63 and 79 ppb
C. At least 79 ppb
D. At most 95 ppb
Answer: A
Mathematics
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3
A. 
B. 3
C. 
D. 
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Evaluate the expression.-73
A. 21 B. -21 C. -343 D. 343
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Multiply the polynomials using a special product formula. Express the answer as a single polynomial in standard form.(x + 10)(x - 10)
A. x2 - 20 B. x2 + 20x - 100 C. x2 - 100 D. x2 - 20x - 100
Mathematics
Round the whole number to the given place.72,328 to the nearest hundred
A. 72,400 B. 72,300 C. 72,310 D. 72,200
Mathematics