The area of a circle is 12.56 square miles. what is the circle's radius? use 3.14 for

You are at a restaurant and owe $38 for your meal. you want to leave a 20% tip. how much will your tip be?

This is a map of the mars exploration rover opportunity predicted landing site on mars. the scale is 1cm : 9.4km. what are the approximate measures of the actual length and width of the ellipse? i mostly need to know how to set it up : )

Find the volume of the solid obtained by rotating the region enclosed by the curves y=1x and y=7^-x about the x-axis. (use symbolic notation and fractions where needed.) volume =