The total bill for dinner was $56 (excluding tip). if the food and drinks cost $50, how much was the tax? show work and explain your answer.

What is the range? can’t seem to find it out

What is the axis of symmetry of the function f(x)=-(x+ 9)(x-21)

Asmall business produces and sells balls. the fixed costs are $20 and each ball costs $4.32 to produce. each ball sells for $8.32. write the equations for the total cost, c, and the revenue, r, then use the graphing method to determine how many balls must be sold to break even.