4) A business is modeling the sales for one of its products for the month. The total income for sales for the month is modeled by 20x + 40 (in dollars). a) If they sold 20 items this month, what is an expression for the price of each item?

b) If the actual price of each item is $15, what is the value of x?

please so work!! :)

Look at this pattern ; 1,4,9, number 10000 belongs in this pattern . what’s the place of this number?

Atriangle has verticals at b(-3,0), c(2,-1), d(-1,2). which transformation would produce an image with verticals b”(-2,1), c”(3,2), d”(0,-1)?

Use the given degree of confidence and sample data to construct a confidence interval for the population mean mu . assume that the population has a normal distribution. a laboratory tested twelve chicken eggs and found that the mean amount of cholesterol was 185 milligrams with sequals 17.6 milligrams. a confidence interval of 173.8 mgless than muless than 196.2 mg is constructed for the true mean cholesterol content of all such eggs. it was assumed that the population has a normal distribution. what confidence level does this interval represent?