Solve.The area of a circle varies directly as the square of the radius. What happens to the area if the radius is doubled?
A. The area is halved.
B. The area is multiplied by 
.
C. The area is doubled.
D. The area is multiplied by 4.
Answer: D
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Two woodworkers, Tom and Carlos, bring in $100 for making a table and $80 for making a chair. On average, Tom must work 3 hours and Carlos 2 hours to make a chair. Tom must work 2 hours and Carlos 6 hours to make a table. If neither wishes to work more than 42 hours per week, find the maximum income. Table Chair Time availableIncome ($) 100 80Tom's time (hr) 2 3 42Carlos's time (hr) 6 2 42
A. $1,560 B. $1,660 C. $1,160 D. $1,060 E. $1,260
Decide whether the pair of lines is parallel, perpendicular, or neither.3x - 2y = -162x + 3y = -20
A. parallel B. perpendicular C. neither
If possible, evaluate the expression by hand. If not, approximate the answer to the nearest hundredth.25-3/2
A. - 
B. 125
C. -125
D. 
Perform the operation and write the result in the standard form.(-10 + 15i) - (7 - 2i)
A. -3 - 17i B. -17 + 17i C. 3 - 17i D. -17 - 17i