PLEASE PLEASE PLEASE HELP

In a high school high jump contest, the height of clearing the bar ranged from 71 inches
to 84 inches. The mean height was 76 inches and the standard deviation was 3.5 inches.
What percent of the jumpers were in the group jumping below 79.5 inches? (HINT: How
many standard deviations is 79.5 inches?)

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.

The measure of an angle is 117°. what is the measure of a supplementary angle?

The amount spent on food and drink by 20 customers is shown below what is the modal amount spent ?