What is the probability that the sample mean life span of 64 calculators from Caseo will exceed the sample mean life span of 81 calculators from Sharpy by greater than 6 months?

Factor completely. 4p^2 + 36p + 81 express the answer in the form (ap + b)^2

Anyone know these questions? i need ,.

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