Solve.A coil of wire rotating in a magnetic field induces a voltage given by  where t is time in seconds. Find the smallest positive time to produce a voltage of 10.

A. 3.33? sec
B. 3 sec
C. 3? sec
D. 3.33 sec


Answer: D

Mathematics

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Solve the problem.An artifact is discovered at a certain site. If it has 61% of the carbon-14 it originally contained, what is the approximate age of the artifact? (carbon-14 decays at the rate of 0.012% annually.)

A. 4119 yr B. 3250 yr C. 1789 yr D. 5083 yr

Mathematics

Solve the problem.Mardi received an inheritance of $70,000. She invested part at 9% and deposited the remainder in tax-free bonds at 4%. Her total annual income from the investments was $5300. Find the amount invested at 9%.

A. $25,000 B. $49,000 C. $64,700 D. $50,000

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Solve the problem.In Little League, Andrew hit 6 home runs in 120 at-bats. What percent of the at-bats were not home runs?

A. 100% B. 95% C. 92% D. 97%

Mathematics

Convert the equation to polar coordinates and then sketch the graph. ? ?

A. ?

   

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B. ?

   

?


C. ?

?

?


D. ?

 

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E. ?

  

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Mathematics