19. Currently, telephone area codes are three-digit numbers whose middle digit must be 0 or 1
Codes whose last two digits are l's are being
used for other purposes, for example, 911. With
these conditions, how many area codes
are
available

Use the method of cylindrical shells to find the volume v generated by rotating the region bounded by the given curves about y = 8.8y = x3, y = 0, x = 4use the method of cylindrical shells to find the volume v generated by rotating the region bounded by the given curves about y = 8.8y = x3, y = 0, x = 4

How many dollars more is the price of a pie than the price of a doughnut at erik’s store

Which graph or graphs appear to show a sinusoid? < me asap !