MATH SMARTIES I WILL GIVE BRAINLIEST AND ALSO CAN YOU GIVE AN EXPLINATION (AND ALSO CAN YOU ANSWER MY OTHER QUESTION THAT I UPLOADED IT THE QUESTION UNDERNEATH THIS ONE)

The depth of a lake at a certain point, wich is a function of the distance of that point from shore, is 30 feet.

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.

With: label the vertices and all the elements needed. find x