In a school survey, students showed these preferences for instructional materials. Answer the question.
About how many students would you expect to prefer written materials in a school of 650 students?
A. About 9 students
B. About 59 students
C. About 117 students
D. About 234 students
Answer: B
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Find the value of df-1/dx at x = f(a).f(x) = x3 - 6x2 - 2, x ? 4, a = 5
A. 
B. 15
C. - 
D. - 
Solve. Round to the nearest percent if necessary.Find the percent of increase when the original amount is 80 and the new amount is 96.
A. 17% B. 16% C. 20% D. 120%
Simplify.
A. 
B. 
C. 
D. 2v
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__f1q185g2.jpg" alt="" style="vertical-align: -8.0px;" /> 
and the demand vectors for the industries are: 
Use the matrix operations on a graphing calculator to find the total demand for the four types of energy from the manufacturing facility and the university.
What will be an ideal response?