Solve the problem.A trough is to be made with an end of the dimensions shown. The length of the trough is to be 
long. Only the angle ? can be varied. What value of ? will maximize the trough's volume?
A. 5°
B. 32°
C. 30°
D. 55°
Answer: C
Mathematics
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Solve the problem.Find a curve through the point (0, 5) whose length integral, 0 ? x ? 1, is L = 
A. y = x2 B. y = x2 + 5 C. y = 2x + 5 D. y = x
Mathematics
Use < or > for ? to write a true sentence.
? 
A. > B. <
Mathematics
Give the adjacent interior angle of ?BCD.
Mathematics
Find the probability.Samantha is taking courses in math and English. The probability of passing math is estimated at 0.4 and English at 0.6. She also estimates that the probability of passing at least one of them is 0.8. What is her probability of passing both courses?
A. 0.12 B. 0.8 C. 0.2 D. 0
Mathematics