Lena received a $90 gift card for a coffe store. she used it in buying coffee that cost $8.72 per pound. after buying the coffee, she had $63.94on her card. how many pounds of coffee did she buy?

Lena bought 3 pounds of coffee.

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