Find the requested value.
{3x + 1 if x < 1 3x if 3 ? x ? 53 - 4x if x > 5
A. -9
B. 4
C. 21
D. 9
Answer: D
Mathematics
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Solve the problem.A railroad tunnel is shaped like a semi-ellipse. The height of the tunnel at the center is 25 ft and the vertical clearance must be 20 ft at a point 18 ft from the center. Find an equation for the ellipse. 
A. 
+ 
= 1
B. 
+ 
= 1
C. 
+ 
= 1
D. 
+ 
= 1
Mathematics
Divide the polynomial by the monomial.
A. 24x5y6 + 72y4 - 84x2 B. 2x7y8 + 6x2y6 - 7x4y2 C. 2x5y8 + 6y6 - 7x2y2 D. 2x5y6 + 6y4 - 7x2
Mathematics
Solve the problem.In a chemistry class, 6 liters of a 4% silver iodide solution must be mixed with a 10% solution to get a 6% solution. How many liters of the 10% solution are needed?
A. 4.0 L B. 2.0 L C. 6.0 L D. 3.0 L
Mathematics
Solve the equation.
= -15
A. -20 B. 20 C. -75 D. 75
Mathematics