Solve the problem. Round to the nearest tenth if necessary.By switching service providers, a family's telephone bill decreased from about $50 a month to about $46. What was the percent of decrease?
A. 8.7%
B.
| 4% |
C. 8%
D. 9%
Answer: C
Mathematics
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Find the unit tangent vector of the given curve.r(t) = 
i + 
j - 12tk
A. T = 
i + 
j - 
k
B. T = 
i + 
j - 
k
C. T = 
i + 
j - 
k
D. T = 
i + 
j - 
k
Mathematics
Solve the problem. There are currently 77 million cars in a certain country, decreasing exponentially by 5.5% annually. How many years will it take for this country to have 67 million cars? Round to the nearest year.
A. 3 yr B. 42 yr C. 10 yr D. 2 yr
Mathematics
Simplify the expression.
(
- 
)
A. 25 - 5
B. 55
C. 5
- 20
D. 15
Mathematics
Subtract.
A. 146 B. 88 C. 66 D. 64
Mathematics