Draw a quadrilateral that does not belong, then explain why. What should I draw and write?

For the equations below which statement is true ?

Ten times the square of a non-zero number is eqaul to ninety times the number

Gabriel determined that his total cost would be represented by 2.5x + 2y – 2. his sister states that the expression should be x + x + 0.5x + y + y – 2. who is correct? explain.