Jody is buying a scrapbook and sheets of designer paper. She has $40 and needs at least $19.00 to buy the scrapbook. Each sheet of paper costs $3.00. How many sheets of paper can she buy?

[10 points, algebra 2]according to my answer key the restrictions are -1 and 4. but why not positive 1?

An airplane travels at an unknown elevation before it descends 3 miles to an elevation of 15 miles. find the elevation of the plane before its descen.

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