Answer:
commutative property of addition
Step-by-step explanation:
A star is written to show multiplication. It is a replacement for a dot or a x which is what you probably learned to be the "times" sign. In upper level maths, the "x" is replaced with a " * " to make it more legible and to avoid confusion with the variable "x".
Answer: 0.001
Step-by-step explanation:
Given
The lock has 3 dials, each with the number 0 through 9.
The first place can be filled in 10 ways and the probability of selecting number '4' out of the 10 is
Similarly for selecting '3' and '9' is also 
Therefore the probability of getting a combination of 4-3-9 is

170 milliliters is the answer
2x+y=8 is the equation perpendicular to x-2y=8.