If B = 2? + 6 and C = -1+62 – 8x?, find an expression that equals
3B - 3C in standard form.

International calls require the use of a country code. many country codes a 3-digit numbers. country codes do not begin with a 0 or 1. there are no restrictions on the second and third digits. how many different 3-digit country codes are possible?

To determine the number of deer in a forest a forest ranger tags 280 and releases them back

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 =