Solve the problem.To get credit for graduation, Brittany completed 20 hours of community service. She worked at a soup kitchen for 
of the time. She picked up litter along highways for 
of the time. The rest of the hours she spent tutoring younger children after school. How much time did Brittany spend tutoring?
A. 5
hours
B. 7
hours
C. 5
hours
D. 6
hours
Answer: C
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A man hikes up a mountain to the peak, where he rests for a few minutes and then continues down the other side of the mountain. We measure his location as distance up from the base of the mountain. What can be said about the man's velocity when he is hiking down the mountain?
A. Velocity is positive. B. Velocity is negative. C. Velocity is 0. D. None of the above.
Graph the step function.f(x) = 
A. 
B. 
C. 
D. 
The energy economy of an area is composed of four industries: gas, coal, hydroelectric and nuclear. The three main consumers of energy are area residential consumers, a manufacturing plant, and a university. Assume that each consumer may use some of the energy produced by each industry, and also that each industry uses some of the energy produced by each of the other industries. The energy needs of each consumer and industry are represented by a demand vector whose entries, in order, give the amount of gas, coal, hydroelectric, and nuclear energy needed by each consumer or industry, in some convenient units. The demand vectors for the consumers are: src="https://sciemce.com/media/4/ppg__tttt0616191201__f1q184g2.jpg" alt="" style="vertical-align: -8.0px;" /> 
and the demand vectors for the industries are: 
What is the total demand for the four types of energy from only the energy industries?
What will be an ideal response?
Divide the first polynomial by the second and state the quotient and the remainder.9x2 - 41x - 20, x - 5
A. Quotient: -9x - 4; remainder: 0 B. Quotient: x + 4; remainder: 0 C. Quotient: 9x + 4; remainder: 0 D. Quotient: 4x - 5; remainder: 0