Graphite is made up of layers of graphene. Each layer of graphene is about 200 200
picometers, or 200×10−12
200
×
10
−
12
meters, thick.

How many layers of graphene are there in a 1.6
1.6
-mm-thick piece of graphite? Write your answer in scientific notation.

Aparticular telephone number is used to receive both voice calls and fax messages. suppose that 25% of the incoming calls involve fax messages, and consider a sample of 25 incoming calls. (a) what is the expected number of calls among the 25 that involve a fax message?

Which of the following equations are equivalent to -2m - 5m - 8 = 3 + (-7) + m? -15m = -4m -7m - 8 = m - 4 -3m - 8 = 4 - m m - 4 = -7m - 8 -8 - 7m = -4 + m -8 - 3m = 4 - m

What is the approximate value of  x  in the equation below.–3.396–0.7080.3040.955