Please please help!! Quick this is worth 10 points if u answer correctly and dont give a fake answer

What is the area of triangle abc if a = 8, b = 11, and c = 15?

If private savings 'v' = 0.75s and total savings 's' equals $4.20 billion, solve for public and private savings.

Monitors manufactured by tsi electronics have life spans that have a normal distribution with a standard deviation of 1800 hours and a mean life span of 20,000 hours. if a monitor is selected at random, find the probability that the life span of the monitor will be more than 17,659 hours. round your answer to four decimal places.