Work out tan(19pi/4) without a calculator

Nell has a sales clerk job that pays $12 per hour for regular gas work hours. she gets double time for any hours over 40 that she works in a week. how many hours did nell work if her weekly pay was $744

Which of the following graphs represents the function f(x) = 2^x

Brainlest answer can you find the area and circumference of a circle given the radius or diameter? if its yes or no explain why