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

Mathematics

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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?

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Find the inverse of the invertible matrix.

A.
B.
C.
D.

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Use front-end rounding to round each number. Then, multiply the rounded numbers to get an estimated answer. Finally, find the exact answer.estimateexact  

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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 From1  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. ?

Mathematics