Find an equation for the graph.
A. y = 4 cos 
B. y = 2 cos 
C. y = 2 cos (4x)
D. y = 4 cos (2x)
Answer: D
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Solve. Round to the nearest hundredth, if necessary.According to Ohm's law, the electric current I, in amperes, in a circuit varies directly as the voltage V. When 17 volts are applied, the current is 4 amperes. What is the current when 21 volts are applied?
A. 4.94 amperes B. 42 amperes C. 4.25 amperes D. 89.25 amperes
Find the inverse of the invertible matrix.
A. 
B. 
C. 
D. 
Use front-end rounding to round each number. Then, multiply the rounded numbers to get an estimated answer. Finally, find the exact answer.estimateexact
A. Estimate: 120; exact: 95.2 B. Estimate: 12; exact: 9.62 C. Estimate: 12; exact: 9.52 D. Estimate: 120; exact: 96.2
Four sectors of some economy are (1) Sector 1, (2) Sector 2, (3) Sector 3, and (4) Sector 4. The input-output table involving these four sectors was as follows (all figures are in millions of dollars)
To
1
2
3
4
From
1
79
1,094
0
1,233
2
64,859
13,086
7
1,074
3
0
0
21,787
0
4
0
0
0
1,375
Total Output
230,677
135,110
129,374
44,140
?
Determine how these four sectors would react to an increase in demand for Sector 1 production of $1000 million.
?
A. 
B. 
?
C. ?
D. ?
E. ?