Erin tried to multiply 70 x 30 by decomposing 70 and 30 into multiples of 10. Her work is below. A-Step 1
B-Step2
C-Step3
D-Step4
E-Erin did not make a mistakes.

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