The radius of a large balloon after it is punctured is represented by the following table:
Time (seconds)
Radius (cm)
401
352
10
302
250
15
20
199
149
Which model for R(t), the radius of the balloon t seconds after it's punctured, best fits the data?
Choose 1

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Find the gradient of f(x,y,z)equals=left parenthesis x squared plus y squared plus z squared right parenthesis superscript negative 1 divided by 2 baseline plus ln left parenthesis x right parenthesis x2+y2+z2−1/2+ln(xyz) at the point left parenthesis negative 2 comma 1 comma negative 2 right parenthesis(−2,1,−2).

Simplify the expression. -2/5(10+15m-20n)