Marcus finds that (3x^2-2y^2+5x)+(4x^2+12y^2-7x)=7x^2 -10y-2x. what error did marcus make?

Aright triangle has an area of 18 square inches. b: if the triangle is not an isosceles triangle, what are all the possible lengths of the legs, if the lengths are whole numbers. answer !

Janet drove 300 miles in 4.5 hours. write an equation to find the rate at which she was traveling

The total cost of anja’s trip to the dentist was $628.35. she paid a flat fee of $89.95 which included the checkup and cleaning and then had 4 cavities filled, each of which cost the same amount. which shows the correct equation and value of x, the cost of each cavity filling?