Which function does not have period 2pi? y = sec x
y = cos x
y = tan x <--- correct but why?
y = sin x

What percent of the circle below is shaded?

Find the center and the radius of the circle with the equation: x^2-2x+y^2+4y+1=0?

The liabilities of cullumber are $99,000. owner’s capital is $143,000; drawings are $96,000; revenues, $467,000; and expenses, $301,000. what is the amount of cullumber company’s total assists?