Whats (12-7i)-(8-3i) simplified? please help!

If you were constructing a triangular frame, and you had wood in the length of 4inches, 4 inches, and 7 inches, would it make a triangle? would you be able to create a frame from these pieces of wood? yes or no. explain your mathematical thinking

Chelsea is graphing the function f(x) = 20()x. she begins by plotting the initial value. which graph represents her first step?

Did i do these question right? if not explain why it’s wrong?