Math project i really need with an explanation step process ! i need to find percent change!

Solve each quadratic equation by factoring and using the zero product property. n^2 - 49 = 0

Simplify this expression. 8x 16(x + y)

Fawn bought a total of 70 cakes for a tea party. she spent $3,025. fawn bought vanilla cakes for $22 each and a fruit filled cake for $55 each. the system of equations below can be used to find the number of vanilla cakes, v, and the number of fruit filled cakes, f, fawn purchased. which system of equations has the same solution as the system below.