In science we find that some cells divide to form two cells every hour. if you start with one cell, how many cells will there be after 7 hours?

Write the expression as a constant , a single trigonometric function, or a power of a trigonometric function. sin x cos x/ tan x

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?

Explain how you can find the missing fraction in 3 4/5 / (blank) 2 5/7. then find the missing fraction.