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Identify a1 and r for the geometric sequence an= -256(-1/4) n-1

Which expression is equivalent to 8(k + m) − 15(2k + 5m)?

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.