8students are in a reading group .some of the students leave. how many students still in the group

Given: m∠ adb = m∠cdb ad ≅ dc prove: m∠ bac = m∠bca lol

Prove that the value of the expression 7^8–7^7+7^6 is divisible by 43.

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