Perform the operations.(10x + 9y)2
A. 100x2 + 81y2
B. 10x2 + 81y2
C. 100x2 + 180xy + 81y2
D. 10x2 + 180xy + 81y2
Answer: C
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Find the vertex, focus, and directrix of the parabola. Graph the equation.(y - 1)2 = -8(x - 1)
A. vertex: (-1, -1)
focus: (-1, -3)
directrix: y = 1
B. vertex: (-1, -1)
focus: (-3, -1)
directrix: x = 1
C. vertex: (1, 1)
focus: (1, -1)
directrix: y = 3
D. vertex: (1, 1)
focus: (-1, 1)
directrix: x = 3
Solve the problem.A closed box with a square base has to have a volume of 8000 cubic inches. Find a function for the surface area of the box.
A. S(x) = x2 + 
B. S(x) = 2x2 + 
C. S(x) = 2x2 + 
D. S(x) = 2x2 + 
Solve.Claire has received scores of 85, 88, 87, and 85 on her algebra tests. What is the minimum score she must receive on the fifth test to have an overall test score average of at least 88? (Hint: The average of a list of numbers is their sum divided by the number of numbers in the list.)
A. 94 B. 95 C. 96 D. 93
Use the Gauss-Jordan method to solve the system of equations.x + 3y + 2z = 11 4y + 9z = -12x + 7y + 11z = - 1
A. 
B. 
C. 
D. 