I need some help with this please! An explanation would be lovely too!

Consider the function f(x)=-5x+3 what is f(-2)

Need showing work for this problem 56.25 ×25.80

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