You put 5000 and a bank account that will give you 2% interest on the money in the account every year how much money will be in the account after 20 years

Cot(90° − x) = 1 the value of x that satisfies this equation is °. a. 60 b. 135 c. 225 d. 315

Math it's appreciated. (picture provided)

Campus rentals rents 2 and 3 bedrooms apartments for $700 ans $900 a month respectively. last month they had six vacant apartments and reported $4600 in lost rent. how many of each type of apartment were vacant?