If angle c=60° , b=5 ,a=4 then find the value of the c ?

What is the total surface area of this square pyramid?

Find the domain of the following expression: 1/(√x)-2

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.