Solve the problem.For an electrical circuit, the voltage E is modeled by E = 2.7cos 38? t, where t is the time in seconds. How many cycles are completed in one second?
A. 19 cycles
B. 38? cycles
C. 2.7 cycles
D. 38 cycles
Answer: A
Mathematics
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Solve.The formula 
represents the number of households N, in thousands, in a certain city that have a computer x years after 1990. According to the formula, in what year were there 89 thousand households with computers in this city?
A. 1993 B. 1994 C. 1995 D. 1992
Mathematics
Find the sum.
A. - 
B. -24
C. 6
D. -75
Mathematics
Find the equation of the hyperbola satisfying the given conditions.Vertices (0, ±22); asymptotes y = 
x, y = - 
x
A. 
- 
= 1
B. 
- 
= 1
C. 
- 
= 1
D. 
- 
= 1
Mathematics
Factor completely, or state that the trinomial is prime.4x3y3 - 4x3y2 - 80x3y
A. x3(4y2 + 16y)(y - 5) B. 4x3y(y + 4)(y - 5) C. 4x3y(y - 4)(y + 5) D. prime
Mathematics