222 \quad \text { (b) } 10
Differentiate w.r.t. b
2220
Evaluate
2220b
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\frac{\mathrm{d}}{\mathrm{d}b}(2220b)
Multiply 222 and 10 to get 2220.
2220b^{1-1}
The derivative of ax^{n} is nax^{n-1}.
2220b^{0}
Subtract 1 from 1.
2220\times 1
For any term t except 0, t^{0}=1.
2220
For any term t, t\times 1=t and 1t=t.
2220b
Multiply 222 and 10 to get 2220.
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