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Find the percent of the number. (Find the part.)
15% of 40 is what?
with work

What are the solutions of the system? solve by graphing. y = -x^2 - 3x + 2 y = -2x + 2

Which of the following represents the length of a diagonal of this trapezoid?

At store a, erasers are sold individually. the cost y of x erasers is represented by the equation y=0.75x. the costs of erasers at store b are shown in the graph.