Question: 1.If f (t)=t 2 + t, find [ f(t + h) -f (t)]/h i am aware of the answer but however l seem not to

1.If f (t)=t2+ t, find [ f(t + h) -f (t)]/h

i am aware of the answer but however l seem not to be it right in my workings, please implicit working and methods to approach a question

2.If f (t)=t2+ t, Between t = 10 and t = 12, what is the increase in f divided by the increase in t?

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