John has 30 marbles , 18 of which are red and 12 of which are blue. jane has 20 marbles, all of them either red or blue. if the ratio of the red marbles to the blue marbles is the same for both john and jane, then john has how many more blue marbles than jane?

answer: 33 ( approx)

step-by-step explanation:

since, in the linear regression formula, the slope is the a in the equation y = b + ax ( by comparing it with the general equation of line y = mx + c )

where,

here given table is,

price ($), x   :           18         23       25       29       30       33

pairs sold, y :         16         13         10       8         6       2

so, ,   ,   ,

and   ,

thus, slop of the given line is,

⇒  

⇒   ≈ 33