Do you always need to make make mixed fractions improper while adding, subtracting, multiplying and dividing?

Find the value of tan theta if sin theta = 12/13 and theta is in quadrant 2

If the cost to mail a package is an initial $5 and $0.28 for every pound the total cost to mail a package was $11.27, how much did the package weigh?

Select the conic section that represents the equation. 3x2 + 3y2 -2x + 4 = 0