Let z = ln(x 2 + y), x = ret . and y = ter . use the chain rule to compute ∂z ∂r and ∂z ∂t at the point where (r, t) = (1, 2).\

By the chain rule,

where .

We have component partial derivatives

Putting the appropriate pieces together and setting , we get

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