Solve.Mark and Rachel both work for Smith Landscaping Company. Mark can finish a planting job in 2 hours, while it takes Rachel 4 hours to finish the same job. If Mark and Rachel will work together on the job, and the cost of labor is $50 per hour, what should the labor estimate be? (Round to the nearest cent, if necessary.)
A. $66.67
B. $37.50
C. $150.00
D. $133.33
Answer: A
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Find the simple interest. The rate is an annual rate unless otherwise noted. Assume 365 days in a year and 30 days per month. Round to the nearest cent.$250 at 3% for 12 months
A. $90.00 B. $0.63 C. $7.50 D. $750.00
Find the domain and range and describe the level curves for the function f(x,y).f(x, y) = 
A. Domain: all points in the xy-plane; range: real numbers 0 ? z ? 10; level curves: circles with centers at (0, 0) and radii r, 0 < r ? 10
B. Domain: all points in the xy-plane; range: all real numbers; level curves: circles with centers at 
C. Domain: all points in the xy-plane satisfying x2 + y2 ? 100; range: real numbers 0 ? z ? 10; level curves: circles with centers at (0, 0) and radii r, 0 < r ? 10
D. Domain: all points in the xy-plane satisfying x2 + y2 = 100; range: real numbers 0 ? z ? 10; level curves: circles with centers at (0, 0) and radii r, 0 < r ? 10
Determine where the given function is concave up and where it is concave down. f(x) = 
A. Concave up on 
and 
, concave down on 
and 
.
B. Concave down on 
and 
, concave up on 
and 
.
C. Concave down on 
and 
, concave up on 
.
D. Concave down on (-?, 0), concave up on (0, ?)
Solve the problem.There were 430 people at a play. The admission price was $2.00 for adults and $1.00 for children. The admission receipts were $620. How many adults and children attended?
A. Adults: 240; children: 190 B. Adults: 190; children: 240 C. Adults: 155; children: 275 D. Adults: 120; children: 310