Find the perimeter of this semi-circle with radius, r = 45cm. Give your answer as an expression in terms of pi

Jacob signs up to work for 2 1/2 hours at the school carnival. if each work shift is 3/4 hour, how many shifts will jacob work? (i just want to double check : |, for anybody that responds! : )

Ellen makes and sells bookmarks. she graphs the number of bookmarks sold compared to the total money earned. why is the rate of change for the function graphed to the left?

Micheal is 4 times as old as brandon and is also 27 years older than brandon. how old is micheal