Calculating income tax Raina made $30,000 in taxable income last year. Suppose the income tax rate is 15% for the first $9000 plus 19% for the amount over $9000. How much must Raina pay in income tax for last year? ​

50 ! pls ! 12.  building codes regulate the steepness of stairs. homes must have steps that are at least 13 inches wide for each 8 inches that they rise.

a. discuss how to find the slope of the stairs.
b. describe how changing the width or height affects the steepness of the stairs.

Little’s law firm has just one lawyer. customers arrive randomly at an average rate of 6 per 8 hour workday. service times have a mean of 50 minutes and a standard deviation of 20 minutes. how long does a customer spend at little’s law firm on average?

Over which interval is the graph of f(x) = x2 + 5x + 6 increasing?