in 2013 the population of brazil was 200,000,000. about how much larger was the population of brazil if africa was 5,000,000?

Can someone me and plz do the problem

2people are trying different phones to see which one has the better talk time. chatlong has an average of 18 hours with a standard deviation of 2 hours and talk-a-lot has an average of 20 hours with a standard deviation of 3. the two people who tested their phones both got 20 hours of use on their phones. for the z-scores i got 1 for the chatlong company and 0 for talk-a-lot. what is the percentile for each z-score?

The quadratic function h(t)=-16.1t^2+150 choose the graph representation