What is the following product? Sqr5x^8y^2 sqr10x^3 sqr12y

Hi, can anyone show me how to do this problem? 100 points for this. in advance

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 area of a circle is equal to 1 dm². find the radius of the circle.