Line t passes through points (5,10) and (7,5). line u is perpendicular to line t

Sally deposited money into a savings account paying 4% simple interest per year.the first year,she earn $75 in interest.how much interest will she earn during the following year?

The bottom of a vase is a square.each side measury y+11 units.the square has a perimeter of 55 units what is the value of y?

The radius of the sphere is 10 units .what is the approximate volume of the sphere use π=3.14