I mix 1 gal of 80% acid with 4 gal of 30% acid. What is the percent of the mixture

The lengths of all sides of a triangle are integers when measured in decimeters. one of the sides has length of 1 dm and another of 3 dm. find the perimeter of the triangle.'

Which letters from the table represent like terms? a and b b and c a and d b and d

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?