Please help me i need it in less that 60 sec

Given the two similar triangles, how do i find the missing length? if a=4, b=5, and b'=7.5 find a'

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

Arestaurant added a new outdoor section that was 8 feet wide and 6 feet long. what is the area of their new outdoor section