Acertain human red blood cell has a diameter of 0.000007 meters which expression represents this diameter in meters in scientific notation

Josh has a rewards card for a movie theater he receives 15 points for becoming a rewards card holder he earns 3.5 points for each visit to the movie theater he needs at least 55 points to earn a free movie ticket which inequality can josh use to determine x, the minimum number of visits he needs to earn his first free movie ticket.

Could somebody me with this radical simplification?

The sum of these consecutive integers is equal to 9 less than 4 times the least of the integer. find the three integers