Paulina owns a popular pizza parlor . She noticed a daily trend in her pizza sales . When her shop opens for lunch at 11 , she sells 30 pizzas each hour for the first three hours Sales dwindle to 10 pizzas per hour for the next 3 hours . Business picks up from 5 until closing time at 11 PM , when she sells 40 pizzas each hour for all 6 hours .

Use addition and subtraction to simplify the following polynomials. a. add polynomials: (3 – 4x + 8x^2) + (–6 + 2x – 5x^2) step 1: rewrite the polynomials without the parentheses. step 2: write the polynomial in descending order and use parentheses around like terms. step 3: add the like terms identified in step 2 to simplify the polynomial. b. subtract polynomials: (3x – 5 – 7x^2) – (–2 + 6x^2 – 5x) step 1: rewrite the polynomials without the parentheses. remember to multiply each term in the second parentheses by –1. show your work. step 2: write the polynomial in descending order and use parentheses around like terms. step 3: add the like terms identified in step 2 to simplify the polynomial.

Select the margin of error that corresponds to the sample mean that corresponds to each population: a population mean of 360, a standard deviation of 4, and a margin of error of 2.5%

What is the axis of symmetry of the function f(x)=-(x+ 9)(x-21)