Please help me.. answer needs to be in numerical form

Zahra wants the equation below to have an infinite number of solutions when the missing number is placed in the box.

Barrett is comparing the membership fees for two museums.the art museum charges a one-time fee of $8.25 plus $2.25 per month. the science museum charges a one-time fee of $10.75 plus $3.50 per month. how much does barrett save by joining the art museum instead of the science museum?

What is the measure of angle lkj ? round to the nearest whole degree