The derivative of f(x) at x=3 is 2x=6 approaching from the left side (apply power rule to y=x^2). The derivative of f(x) at x=3 is m approaching from the right side. In order for the function to be differentiable, the limit of derivative at x=3 must be the same approaching from both sides, so m=6. Then, x^2=mx+b at x=3, plug in m=6, 9=18+b, so b=-9.
The rule says that the sum of any two sides has to be smaller than the third side so, no it can't
A) 10s=2m
B) It would take 20 seconds for 4 miles
Area= 12m * 12m = 144m^2 *7.00$ = 1008$.
Final answer: 1008$
