The angle of elevation of a ladder is 19∘ and the ladder is 12 feet from the wall.

what is the height of the ladder in feet?

enter your answer as a number rounded to the nearest tenth of a foot, like this: 42.5

Find the midpoint m of z1=(8+5i) and z2=(12+3i)

Which of the following circles have their centers in the third quadrant?

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