Use the substitution method to solve the system of equation. choose the correct ordered pair. y=10x-9 y=x+18

Agreeting card company can produce a box of cards for $7.50. if the initial investment by the company was $50,000, how many boxes of cards must be produced before the average cost per box falls to $10.50?

Which statements about these triangles is true

Acircle has a radius of 5/6 units and is centered at (3.6, 7.8) write the equation of this circle