Does the graph represent a function? yes or no lol pls help

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.

Find the value of x in the diagram below. select the best answer from the choices provided

Heather is riding a quadratic function that represents a parabola that touches but does not cross the x-axis at x=-6