Is 0.1 bigger than 0.11

Using only the digits 5, 6, 7, 8, how many different three digit numbers can be formed if no digit is repeated in a number?

What should be done to both sides of the equation in order to solve -5m = -40? a) multiply by -5. b) divide by -5. c) multiply by -40. d) divide by -40.

Find the tenth term in the following geometric sequence. 8, 4, 2, 1, . .a) 13b) 0.0078c) 0.0156d) 12.5