× 1.3 = 1.56 can you help me please

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.

The amount spent on food and drink by 20 customers is shown below what is the modal amount spent ?

In the equation sqrt(n+5)-sqrt(11-10)=1. what is the value of n