Applications of Integration (VCE SSCE Mathematical Methods): Quizzes

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Applications of Integration
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What is the formula for the average value of ff over interval [a,b][a,b]?

1baabf(x)dx\frac{1}{b-a}\int_a^b f(x)\,dx

What does the average value of a function represent geometrically?

Height of rectangle with same area as curve

For f(x)=x2f(x) = x^2 on [0,2][0,2], what is the average value?

43\frac{4}{3}

What does integration do when working with rates of change?

Works backwards to find total change

For dTdt=0.5(T30)\frac{dT}{dt} = -0.5(T-30), what type of graph is dTdt\frac{dT}{dt} vs TT?

Straight line through (30,0)(30,0)

If dTdt=0.5(T30)\frac{dT}{dt} = -0.5(T-30), what is dtdT\frac{dt}{dT}?

2T30\frac{-2}{T-30}

What is the area under dtdT\frac{dt}{dT} from T=35T=35 to T=120T=120 in the cooling example?

5.785.78 minutes

What does the area under a dtdT\frac{dt}{dT} curve represent?

Time for temperature change

What does dtdT\frac{dt}{dT} tell us in the cooling problem?

Time per degree of temperature change

In the average value formula, what does abf(x)dx\int_a^b f(x)\,dx represent?

Total area under the curve

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