Express the number in decimal notation.8.1 × 105

A. 81,000
B. 8,100,000
C. 405
D. 810,000


Answer: D

Mathematics

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Parametric equations and a parameter interval for the motion of a particle in the xy-plane are given. Identify the particle's path by finding a Cartesian equation for it. Graph the Cartesian equation. Indicate the portion of the graph traced by the particle and the direction of motion.x = 3 cos t, y = 3 sin t, ? ? t ? 2?

A. x2 + y2 = 9

Counterclockwise from (3, 0) to (3, 0), one rotation
B. x2 + y2 = 9

Clockwise from (3, 0) to (-3, 0)
C. x2 + y2 = 1

Clockwise from (1, 0) to (1, 0), one rotation
D. x2 + y2 = 9

Counterclockwise from (-3, 0) to (3, 0)

Mathematics

Find the present value. Round to the nearest cent.To get $2000 after 8 years at 4% compounded semiannually

A. $1461.38 B. $1486.03 C. $543.11 D. $1456.89

Mathematics

Tell whether the statement is true or false.{11, 14, 15, 17} ? {14, 15, 18, 19} = {14, 15}

A. True B. False

Mathematics

Solve the problem.According to Ohm's law, the electric current I, in amperes, in a circuit is directly proportional to the voltage V. When 29 volts are applied, the current is 2 amperes. What is the current when 28 volts are applied?

A. 14.5 amperes B. 406 amperes C. 59 amperes D. 1.93 amperes

Mathematics