If anyone is able please help a girl out

Anna is constructing a line segment that is congruent to another segment ab. for the construction, which tool should be used to mesure segment ab

Square a has a side length of (2x-7) and square b has a side length of (-4x+18). how much bigger is the perimeter of square b than square a?and show all work! you so

Betty correctly answers 30 questions on your math test there are 40 questions on the test what percent of the questions did she answered incorrectly