Help! in 20P9 what does the 9 represent?

What is the solution to the equation 9^(x+1) =27

Through non-collinear points there is exactly one plane.

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.