Solve the system by any method.0.5x - 0.1y = 3.60.4x - 0.3y = 4.2
A. {(9.3, -1.5)}
B. ?
C. {(5.4, -3.7)}
D. {(6, -6)}
Answer: D
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Graph the quadratic equations.y = x2 + 2x - 5
A. 
B. 
C. 
D. 
Simplify the expression. Assume all variables represent nonzero real numbers.
2
A. 
B. 
C. 
D. 
Factor by any method.15x10 + 18x5y4 + 20x5y4 + 24y8
A. (3x5 - 4y4)(5x5 - 6y4) B. (3x5 + 4y4)(5x5 + 6y4) C. (15x5 + 4y4)(x5 + 6y4) D. (3x5 + 4y)(5x5 + 6y8)
A spherical party balloon is being inflated by helium pumped in at a rate 3 cubic feet per minute. How fast is the radius growing at the instant when the radius has reached 1 foot? Round your answer to the two decimal places.
?
The volume of a sphere of radius r is 
.
?
A. 0.72 feet per minute B. 0.76 feet per minute C. 0.14 feet per minute D. 0.64 feet per minute E. 0.24 feet per minute