Perform the indicated operations. Leave the result in polar form.[0.79(cos 210° + j sin 210°)][0.34(cos 20° + j sin 20°)]
A. 1.13(cos 230° + j sin 230°)
B. 0.2686(cos 230° + j sin 230°)
C. 0.2686(cos 4200° + j sin 4200°)
D. 1.13(cos 4200° + j sin 4200°)
Answer: B
Mathematics
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Find the range of the quadratic function.f(x) = 2x2 + 2x - 5
A. (-?, - 
]
B. [- 
, ?)
C. (-?, - 
]
D. [- 
, ?)
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Find the average of the set of numbers.5
and 8
A. 14
B. 6
C. 6
D. 7
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Determine whether the given expression is a polynomial. If it is, write it in standard form.0.1x9 - 7.9
A. Yes; 0.1x9 - 7.9 B. No
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Solve. If necessary, round percents to the nearest tenth, dollar amounts to the nearest cent, and all other numbers to the nearest whole.In the past ten years, the population of a city decreased from 215,000 to 
Find the percent decrease.
A. 97.7% B. 2.3% C. 4200% D. 2.4%
Mathematics