Prove that the angle bisectors of the base angles of the isosceles triangle are congruent by one of the following rules:
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asa/saa
cannot be determined
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Solve the system of equations. y= 2x y= x^2 - 15

Aretha wanted to gather data about the cost of local bowling leagues in her area. she plotted the data and determined that the average bowling league costs consist of a one-time registration fee and a monthly fee modeled by the equation y = 15x + 20. identify and interpret the y-intercept in this model. the y-intercept is 20. this is the cost per month. the y-intercept is 20. this is the cost of registration. the y-intercept is 15. this is the cost of registration. the y-intercept is 15. this is the cost per month.

2/3(-6y+9x) expand each expression using the distributive property