Find the indicated sum. Find the sum of the first 9 terms of the geometric sequence: 
, - 
, 
, - 
, 
, . . .
A. 
B. 616
C. 
D. 
Answer: D
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Solve the proportion.
= 
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__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?
Solve. Round to the nearest tenth.A rectangular plot of land is 78 meters wide by 95 meters long. Find the length of the diagonal and if necessary, round to the nearest tenth meter.
95 m
A. 54.2 m B. 122.4 m C. 122.9 m D. 173 m
Use the formula A = P(1 + rt) to find the indicated quantity.Allan borrowed $5500 from his father to buy a car. He repaid him after 8 months with interest of 7% per year. Find the total amount he repaid.
A. $5724.58 B. $5885.00 C. $256.67 D. $5756.67