Elijah started his hike at an elevation of 215 feet below sea level. Throughout the hike, he ascended 2,400 feet and then descended 576 feet. How much did his elevation change? A. 3,191 feet
B. 1,609 feet
C. 2,761 feet
D. 2,039 feet

Select the correct answer from each drop-down menu. consider the following polynomials equations. 3x^2(x-1) and -3x^3+ 4x^2-2x+1 perform each operation and determine if the result is a polynomial. is the result of a + b a polynomial? yes or no is the result of a - b a polynomial? yes or no is the result of a · b a polynomial? yes or no