Need to find <1 and <2

Select the graph of the solution. click until the correct graph appears. |x| = 3

How many 3-digit numbers can you write using only digits 1 and 7? (of course, digits can repeat.) how many 3-digit numbers can you write using only digits 1 and 7? (of course, digits can repeat.)

What is the height of a cylinder with a volume of 384x cubic inches and a radius of 8 inches? round to the nearest tenth of an inch