Pls help due very soon
Pls answer every question if you can!

Find the sum of 4x^{2} -4+6 and -7^{2} +3x+1

Lucy is a dress maker. she sews \dfrac47 7 4 of a dress in \dfrac34 4 3 hour. lucy sews at a constant rate. at this rate, how many dresses does lucy sew in one hour? include fractions of dresses if applicable

2x minus y equals 6, x plus y equals negative 3