the sum of two positive intergers a ,and b , is atleast 30 the difference of the two intergers is atleast 10 . if b is the greater interger which system of inqualites could represent the vaules of a and b

What values of x satisfy the inequality x^2-9x< 0? how is your answer shown on the graph?

Which of the following represents the range of the graph of f(x) below

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