How many of these sequences have a common different of -4? -19, -15, -11, -7, -3, 19, 15, 11, 7, 3, 3, 7, 11, 15, 19, -3, 7, -11, 15, -19, 0 1 2 3

Can someone me and plz do the problem

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! : )

Including 6% sales tax, an inn charges $135.68 per night. find the inns nightly cost