sarah is demonstrating the idea that polynomials are closed under addition her work and explanation are shown part a add 3x^4+6x-7 to a 2x^3-(2x)^2+4x^-1 b (2x)^2+4.4x-9 x(-8x)^-2 -(3x)^3+7 part b is in the picture

Due to bad planning, two of the local schools have their annual plays on the same weekend. while 457 people attend one, and 372 attend the other, only 104 people were able to attend both. how many people went to at least one play?