Could you use the double fact to find the sum for 4+5? choose yes or no 4+4=8 yes or no 5+5=10 yes or no 9+9=18 yes or no

How do you graph linear equation x+y=4

Given the following sampling distribution of one mean with a sample size 49, from a normally distributed population,find the population standard deviation, o.79828588912497

How many sides does a regular polygon have if each exterior angle measure is 45 degrees explain your answer, i really don't understand this.