Which of the following expressions could NOT be changed to have a denominator of 20 to solve? (A) 9/5 - 12/16
(B) 1/5 - 3/18
(C)8/16-2/5
(D)3/4-22/40

Asystem of equations has 1 solution. if 4x-y=5 is one of the equations , which could be the other equation ?

If the sales price of a dvd is $20 and the markup is 34%, what is the cost of the dvd?

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