Find the first 4 terms of the recursively defined sequence.a1 = -1, an + 1 = 2 ? an
A. -2, -4, -8, -16
B. 0, 5, -5, 0
C. -1, -2, -4, -8
D. -1, -5, 0, 5
Answer: C
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Solve the problem.Mark can remember only the first 5 digits of his friend's phone number. He also knows that the number has 7 digits and that the last digit is not a 0. If Mark were to dial all of the possible numbers and if it takes him 17 seconds to try each one, how long would it take to try every possibility?
A. 25.5 min B. 2.8 min C. 28.3 min D. 5.7 min
Solve the problem.Use the graph of the function f to find
f(x).
A. ? B. -? C. 0 D. does not exist
If 
with A in QII find 
.
?
A. 
B. 
C. 
D. 
E. 
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 36% 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. between 63 and 78 ppb B. At least 78 ppb C. At most 94 ppb D. At most 78 ppb