Consider the function f(x)=x^2+5
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The parabola y = x² - 4 opens: a.) up b.) down c.) right d.) left

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.

Math i have no idea how to do a and b