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Evaluate the expression for the given value of the variable 7a - 4a for a =8

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

Find the unit rate for: 75% high-fiber chimp food to 25% high -protein chimp food.