Find the standard form of the equation of the circle.Center at the origin and containing the point (5, 10).
A. x2 + y2 = 125
B. x2 + y2 = 15
C. x2 + y2 = 
D. x2 + y2 = 5
Answer: D
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Use a calculator to choose the equation whose graph is shown.
A. r = 3 sin ?
B. r = 
C. r = 
D. r = 
Suppose that ? is in standard position and the given point is on the terminal side of ?. Give the exact value of the indicated trig function for ?.(15, 20); Find cos ?.
A. 
B. 
C. 
D. 
Solve the problem.A rectangular box with volume 345 cubic feet is built with a square base and top. The cost is $1.50 per square foot for the top and the bottom and $2.00 per square foot for the sides. Let x represent the length of a side of the base. Express the cost of the box as a function of x. Give the function and state its domain.
A. C(x) = 3x2 + 
Domain: {x| x > 0}
B. C(x) = 4x + 
Domain: {x| x > 0}
C. C(x) = 3x2 + 
Domain: {x| x > 4}
D. C(x) = 2x2 + 
Domain: {x| x < 10}
Solve. Write the answer in simplest form.Maria exercises for 1
hours every Saturday. She runs for 
of the time that she exercises. How much time does she spend running every Saturday?
A. 1
hours
B. 2
hours
C. 
hour
D. 
hour