Convert to Celsius. Use the formula C = 
(F - 32) or C = 
. Round your answer to the nearest tenth if necessary.66°F
A. 150.8°C
B. 86.8°C
C. 4.7°C
D. 18.9°C
Answer: D
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Use the quadratic formula to solve the equation.0.5x2 + 0.3x + 0.4 = 0
A. {
, 
}
B. {
, 
}
C. {
, 
}
D. {
, 
}
Use percents, percent equations, and/or percent proportions to solve the application.A company has 25 franchises in China. This number is expected to increase to 32 over the next three years. What is this percent increase?
A. 7% B. 21.9% C. 72% D. 28%
Solve the problem.During the first five months of the year, Len earned commissions of $3160, $2810, $3140, $2800, and $2380. If Len must have average monthly earnings of at least $2780 in order to qualify for retirement benefits, what must he earn in the sixth month in order to qualify for benefits?
A. at least $2390 B. at least $2858 C. at least $2780 D. at least $2845
Find the exact value of the expression.cos 
sin 
- cos 
sin 
A. 
B. 1
C. 
D. 