Which property is used in the problem below? 2(x+4)=2x+8 the associative property the commutative property the distributive property the additive identity property

The difference of three and the reciprocal of a number is equal to the quotient of 20 and the number. find the number.

What number is 7 units left of -15?

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