Lena is competing in a 400 m race. She runs at a constant speed of 4.7 m/s for the first 150 m, then 4.1 m/s for 30 seconds. The remainder of the race takes her 42 seconds to complete. What is Lena's average speed for the entire race to 1 dp?

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