Add.(-10y2 + 9) + (3y2 - 5y - 2)
A. -13y2 - 5y + 7
B. -7y2 + 5y + 7
C. -7y2 - 5y + 7
D. -7y2 - 5y + 11
Answer: C
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Solve the problem. Round your answer, if appropriate.Electrical systems are governed by Ohm's law, which states that V = IR, where V = voltage, I = current, and R = resistance. If the current in an electrical system is decreasing at a rate of 3 A/s while the voltage remains constant at 28 V, at what rate is the resistance increasing (in ?/sec) when the current is 20 A? (Do not round your answer.)
A. 
?/sec
B. 
?/sec
C. 
?/sec
D. 
?/sec
Decide on the payoff in this game when the specified strategy is used.(1, 3)
A. $5 from B to A B. $5 from A to B C. $10 from B to A D. No payoff
Simplify the fraction.
A. 
B. 
C. 
D. 
Express the exercise as a system of linear equations, then find the solution. Use a calculator where appropriate.A college student earned $8400 during summer vacation working as a waiter in a popular restaurant. The student invested part of the money at 
and the rest at 
If the student received a total of $638 in interest at the end of the year, how much was invested at 
A. $1200 B. $4200 C. $5900 D. $2500