Solve the problem.A cross-country skier reaches the 13-km mark of a race 40 min after reaching the  mark. Find the speed of the skier.

A.  km/hour
B.  km/hour
C. 27 km/hour
D. 9 km/hour


Answer: A

Mathematics

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For the given polar equation, write an equivalent rectangular equation.r = 1 + 2 sin ?

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

Mathematics

Change the polar coordinates (r, ?) to rectangular coordinates (x, y).(4, 270°)

A. (-4, 0) B. (0, -4) C. (0, 4) D. (4, 0)

Mathematics

Multiply or divide as indicated. ÷ 

A.
B.
C.
D.

Mathematics

Write the statement using symbols.Three times the difference of x and 8 is -10.

A. 3x - 8 = -10 B. 3 - x - 8 = -10 C. 3 + x - 8 = -10 D. 3(x - 8) = -10

Mathematics