9) In a four-year period, about 80,000 acres of coastal wetlands in the US are lost each year What integer represents the total change in coastal wetlands?show work please.
(I just need the number 9 ty<3)

Given the following sampling distribution of one mean with a sample size 49, from a normally distributed population, find the population standard deviation, o.79828588912497

The manufacturer of a new product developed the following expression to predict the monthly profit, in thousands of dollars, from sales of the productwhen it is sold at a unit price of x dollars.-0.5x^2 + 22x - 224what is represented by the zero(s) of the expression? a. the profit when the unit price is equal to 0b. the unit price(s) when the profit is equal to 0c. the profit when the unit price is greatestd. the unit price(s) when profit is greatest

The ratio of the measures of the three angles in a triangle is 2: 9: 4. find the measures of the angels