Can anybody answer these questions. By the way the questions are separated in different screenshots that i put. Pls help. I will give who ever answers it the brainliest.

Which rational number could be graphed between -4 and -5

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

If the tip varies directly with the number of guest which equation represents between the tip,t, and the number of guest,g?