How do i add a negative symbol to a digital calculator? is the first one -18.2? ?

What is the radius of a circle with an area of 78.5 cubic inches? use 3.14 for pie

An internet company charges $8.95 per month for the first 3 months that it hosts your web site. then the company charges $11.95 per month for web hosting. how much money, in dollars, will the company charge for 8 months of web hosting?

What is the measure of sty in oo below? 130 310 230 50