Multiply.20(-15)
A. -320
B. 285
C. -285
D. -300
Answer: D
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Solve the problem.An oil storage tank can be described as the volume generated by revolving the area bounded by 
about the x-axis. Find the volume 
of the tank.
A. 66.5 m3 B. 399 m3 C. 1.85 m3 D. 2970 m3
Write a system of linear equations in three variables, and then use matrices to solve the system.The table below shows the number of birds for three selected years after an endangered species protection program was started.
Use the quadratic function y = ax2 + bx + c to model the data. Solve the system of linear equations involving a, b, and c using matrices. Find the equation that models the data.
A. y = 6x2 + 24x + 20 B. y = 7x2 - 12x + 28 C. y = 5x2 + 12x + 25 D. y = 10x2 - 36x + 21
Solve.The voltage across a resistor is jointly proportional to the resistance of the resistor and the current flowing through the resistor. If the voltage across a resistor is 
for a resistor whose resistance is 
and when the current flowing through the resistor is 
find the voltage across a resistor whose resistance is 
and when the current flowing
through the resistor is 
A. 72 volts
B. 36 volts
C. 24 volts
D. 54 volts
Find the indicated probability.In a family with family with 4 children, excluding multiple births, what is the probability of having 2 girls and 2 boys, in that order? Assume that a boy is as likely as a girl at each birth.
A. 
B. 
C. 
D. 