Solve the problem.An auto repair shop charged a customer $280 to repair a car. The bill listed $80 for parts and the remainder for labor. If the cost of labor is $50 per hour, how many hours of labor did it take to repair the car?
A. 4.5 hours
B. 5 hours
C. 3 hours
D. 4 hours
Answer: D
Mathematics
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The vertex of a parabola occurs where the derivative of its equation is 0, so an equation associated with the equation of a parabola can be solved to find the x-coordinate of the vertex. Find the vertex of the parabola, given the equation of the parabola and its associated equation.Equation of parabola: f(x) = -(7 + 8x + 3x2); associated equation: 0 = -8 - 6x
A. 
B. 
C. 
D. 
Mathematics
Use De Moivre's theorem to evaluate the expression. Write the result in standard form.(2(cos 180° + i sin 180°))4
A. -16i B. -16 C. 16i D. 16
Mathematics
Add.
A. 1021 B. 1611 C. 1122 D. 1101
Mathematics
Find the coefficient of the given term in the binomial expansion.x4y11 term, (x + y)15
A. 455 B. 1365 C. 5460 D. 4
Mathematics