Tennis balls cost $7 for a can of 3. steve gives the cashier $40 t to balls and receives $12 in change. how many tennis ball did steve buy?

Suppose the radius of a circle is 16. what issuppose the radius of a circle is 16. what is its circumference its circumference

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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 =