Answer the question about the given function.Given the function f(x) = -5x2 - 10x + 8, what is the domain of f?
A. all real numbers
B. {x|x ?-1}
C. {x|x ? -1}
D. {x|x ? 1}
Answer: A
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Graph the system of inequalities.
? 5y ? 3y ? x2 - 3
A. 
B. 
C. 
D. 
Graph the polar equation for ? in [0°, 360°).r = 8 cos 7?
A. 
B. 
C. 
D. 
Translate to a system of three equations, then solve.A company sells nuts in bulk quantities. When bought in bulk, peanuts sell for $1.20 per pound, almonds for $2.65 per pound, and cashews for $3.50 per pound. Suppose a specialty shop wants a mixture of 400 pounds that will cost $2.93 per pound. Find the number of pounds of each type of nut if the sum of the number of pounds of almonds and cashews is four times the number of pounds of peanuts. Round your answers to the nearest pound.
A. Peanuts: 270 lb., almonds: 80 lb., cashews: 50 lb. B. Peanuts: 80 lb., almonds: 50 lb., cashews: 270 lb. C. Peanuts: 90 lb., almonds: 50 lb., cashews: 260 lb. D. Peanuts: 50 lb., almonds: 270 lb., cashews: 80 lb.
Solve the problem.The sum of two numbers is 49 and their difference is 1. Find the numbers.
A. 49 and 0 B. 26 and 27 C. 23 and 26 D. 25 and 24