Solve the problem.Two pumps can fill a water tank in 45 minutes when working together. Alone, the second pump takes 3 times longer than the first to fill the tank. How long does it take the first pump alone to fill the tank?
A. 80 min
B. 60 min
C. 33.75 min
D. 67.5 min
Answer: B
Mathematics
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Identify the intersection of the plane with the solid.Egg-shaped
The remainder of the figure is below the plane.
A. Semicircle
B. Circle or oval
Mathematics
Find the focus and directrix of the parabola with the given equation.y2 = -28x
A. focus: (0, -7) directrix: y = 7 B. focus: (-7, 0) directrix: x = 7 C. focus: (-7, 0) directrix: y = 7 D. focus: (7, 0) directrix: x = -7
Mathematics
Determine whether the pair of lines is parallel, perpendicular, or neither.y + 17 = -4x5y = 25x - 1
A. Parallel B. Perpendicular C. Neither
Mathematics
Find the quotient.
A. 52 B. 0 C. Undefined D. 1
Mathematics