A food places sells lasagna and pasta. One evening, the store sold $837 worth between boths meals. The lasagna cost $10.00 and the pasta $7.00. If the number of lasagna sold twice of the pasta's sold. How many of each were sold?

On a string instrument, the length of a string varies inversely as the frequency of its vibrations. an 11-inch string has a frequency of 400 cylces per second. find the frequency of a 10-icnch string.

Find the zeros of each function. f(x) = 6x^2 - 7x - 20

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