The letters r and ? represent polar coordinates. Write the equation using rectangular coordinates (x, y).r = 1 + 2 sin ?

A.  = x2 + y2 + 2x
B. x2 + y2 =  + 2y
C.  = x2 + y2 + 2y
D. x2 + y2 =  + 2x

Answer: B

Mathematics

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Solve the problem.A generator produces an alternating current according to the equation I = 48 sin 109?t, where t is time in seconds and I is the current in amperes. What is the smallest time t such that I = 24?

A.  sec
B.  sec
C.  sec
D.  sec

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Find the exact interest for the following. Round to the nearest cent.A loan of $49,000 at 13% made on February 26 and due on June 30

A. $2194.11 B. $2247.19 C. $2216.41 D. $2164.05

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Solve the system of equations by the elimination method. Check your solutions. For any dependent equations, write your answer in the ordered pair form.

A. {(-5, -6)} B. ? C. {(-6, 0)} D. {(-5, -1)}

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Mathematics

Graph the linear inequality.y ? 3

A.

B.

C.

D.

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Mathematics