What is the reason for the last step in the argument?
a) division
b) addition
c) subtraction
d) symmetric property

How many solutions does the nonlinear system of equations graphed below have?

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

Can anyone me get through my algebra 2 class? the only class i need to graduate..