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.
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4 hats at $5 each is a total of $20
4x5=20
44 - 20 = 24 Subtract the cost of the hats from the total
24 / 2 = $12 Divide the total that is left by the 2 shirts
Each shirt costs $12
What grade are y in I can maybe help