How many solutions does an equation have when you isolate the variable and it equals a constant? For example you solution is x = 2

If 10 men take 18 days to mow 60 acres of grass, how long will 15 men take to mow 80 acres?

How do you use the elimination method for this question? explain, because i really want to understand!

Ur environment is very sensitive to the amount of ozone in the upper atmosphere. the level of ozone normally found is 4.04.0 parts/million (ppm). a researcher believes that the current ozone level is not at a normal level. the mean of 2525 samples is 4.44.4 ppm with a standard deviation of 0.80.8. assume the population is normally distributed. a level of significance of 0.020.02 will be used. make the decision to reject or fail to reject the null hypothesis. answer tables