If we flip 6 coins what is the probability of getting at least 2 heads

In the diagram below, dab and dac are adjacent angles. if mdac = 25°, what is mdab in degrees? what is mbac in degrees?

Do graduates from uf tend to have a higher income than students at fsu, five years after graduation? a random sample of 100 graduates was taken from both schools. let muf be the population mean salary at uf and let mufsu be the population mean salary at fsu. how should we write the alternative hypothesis?

The difference of two numbers is 40. find the numbers if 0.3 parts of one number is equal to 37.5% of the other one.