Solve the problem.The voltage E in an electrical circuit is given by E = 7.3 cos 40?t, where t is time measured in seconds. Find the period.
A. 20?
B. 
C. 
D. 20
Answer: B
Mathematics
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Evaluate the algebraic expression for the given values of the variables.6x2 + 3y for x = 9 and y = 4
A. 2928 B. 2016 C. 498 D. 123
Mathematics
Solve the equation.
= 3 + 
A. ? B. {-5, -8} C. {5, 8} D. {-1}
Mathematics
Use the quadratic function to determine if the function has a maximum or minimum value and then find this maximum or minimum value.f(x) = 
x2 + 4x - 4
A. maximum at 
B. minimum at 
C. minimum at 
D. maximum at 
Mathematics
Solve. Jennifer is building some shelves and requires 18 pieces of wood that are each 2
feet long. What is the total length of wood that Jennifer needs?
A. 36 feet
B. 20
feet
C. 108 feet
D. 48 feet
Mathematics