Solve the problem.A bag of marbles has twice as many blue marbles as green marbles, and the bag has at least 39 marbles in it. At least how many green marbles does it have?
A. at least 13 green marbles
B. at least 14 green marbles
C. at least 26 green marbles
D. at least 20 green marbles
Answer: A
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Solve. Graph the solution on a number line, and express it in interval notation.x - 
> - 
A. x > - 
, 
B. x > 
, 
C. x > - 
, 
D. x < - 
, 
Solve the problem.A generator produces an alternating current according to the equation 
, where t is time in seconds and I is the current in amperes. What is the smallest time t such that I = 12?
A. 
sec
B. 
sec
C. 
sec
D. 
sec
Solve the problem.In a right triangle, one acute angle is 54° more than twice the other. Find each acute angle.
A. 12° and 78° B. 37° and 53° C. 28° and 62° D. 21° and 69°
Solve.A wind turbine generator produces P kilowatts of power for wind speed w (measured in miles per hour) according to the equation P= 2.6w2. Thus, the number of kilowatt hours P as a function of w is P(w) = 2.6w2. At a particular time the wind speed is measured to be 20 miles per hour. However, the measuring device is known to have an inherent error of measure, e. Find an expression for the actual amount of energy produced by finding 
A. P(20 + e) = e + 1040 B. P(20 + e) = 2.6e2 + 20 C. P(20 + e) = 2.6e2 + 1040 D. P(20 + e) = 2.6e2 + 104e + 1040