Awnser plz! what is 4.031 in expanded form! also these 9.68 me plz

Find the solution of system of equation y= x-4 y=4x+2

An 18% discount on a watch saved a shopper $72. find the price of the watch before the discount

Astudent draws two parabolas on graph paper. both parabolas cross the x-axis at (–4, 0) and (6, 0). the y-intercept of the first parabola is (0, –12). the y-intercept of the second parabola is (0, –24). what is the positive difference between the a values for the two functions that describe the parabolas? write your answer as a decimal rounded to the nearest tenth