Eliminate the arbitrary constants a and b from z=(x-a)^2 + (y-b)^2​

Two corresponding sides of two similar triangles are 3cm and 5cm. the area of the first triangle is 12cm^2. what is the area of the second triangle?

The figure below shows rectangle abcd and the triangle eca on a coordinate plane. which of the following expressions represents the perimeter of triangle of triangle eca in units

If the sales price of a dvd is $20 and the markup is 34%, what is the cost of the dvd?