Tyler is simplifying the expression 6 - 2x + 5 + 4x. Here is his work. 1: 6 - 2x + 5 + 4x
2: (6 - 2)x + (5 + 4)x
3: 4x + 9x
4: 13x
Tyler's work is incorrect. Explain the error he made. please answer quickly and no links

Ahas the coordinates (–4, 3) and b has the coordinates (4, 4). if do,1/2(x, y) is a dilation of △abc, what is true about the image △a'b'c'? check all that apply. ab is parallel to a'b'. do,1/2(x, y) = the distance from a' to the origin is half the distance from a to the origin. the vertices of the image are farther from the origin than those of the pre-image. a'b' is greater than ab.

Can someone answer these problems for me

1. what is the phythaforean theorem? 2.what do we use it for? 1.what is the distance formula ? 2.what do we use it for?