What is the awnser to |x|=-1

Present age of man is 45 years, 5 years back his age was 4 times age of his son what is present age of his son?

According to a study conducted in 2015, 18% of shoppers said that they prefer to buy generic instead of name-brand products. suppose that in a recent sample of 1500 shoppers, 315 stated that they prefer to buy generic instead of name-brand products. at a 5% significance level, can you conclude that the proportion of all shoppers who currently prefer to buy generic instead of name-brand products is higher than .18? use both the p-value and the critical-value approaches.

Find the rate at which the water is now flowing from the tap give your answer cubic centimetres per second