Using the parallelogram method in each case 10km left,20km up

The image shows a pendulum in simple harmonic motion the pendulum starts at a and swing to e

The electronic structure or chlorine is 2.8.7 what is the electronic structure of fluorine?

The number of passengers who arrive at the platform of a subway station for the 10 am train is a random variable with a mean of 120 and a variance of 16. find the lower bound of the probability that there will be between 100 and 140 passengers (round off to second decimal place).