In ΔABC , angle C is a right angle. Which statement must be true? A. sin A = cos B B. sin A = tan B C. sin B = tan A D. sin B = cos B please hurry

What are the domain and range of f(x)=[1/5]x

Apublic library wants to place 4 magazines and 9 books on each display shelf. the expressions 4s +9s represents the total number of items that will be displayed on s shelves. simplify this expression

Solve with work both bert and ernie received an increase in their weekly salaries. bert's salary increased from $520 to $520. ernie's salary went from $580 to $645. find the percent of increase for each salary. what was the larger of the two percents ?