The Census at Schools program collects data each year from students enrolled in primary and secondary schools in many different countries. In a random sample of 100 students selected from participating schools in Canada, the sample mean arm span of boys is 157.3 cm and the sample standard deviation is 15.43 cm. Find the 95% confidence interval for the population mean span of boys from participating schools in Canada. Use t*

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.

Christina can paint 420 square feet in 105 minutes. which unit rate describes the scenario?

8. kelly wants to buy a magazine that is $25. later the magazine was marked up an additional 20%. what is the new price?