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professor190 [17]
3 years ago
5

I just need some quick help with this. Distributive properties aren't my best section.

Mathematics
1 answer:
Anni [7]3 years ago
4 0
In this case u can’t use the distributive property. U just multiple whats in the parenthesis (39•5)=195 and that’s ur answer.
Let’s say if the problem said 5(2+1) u can’t use the distributive property bc u have to do what’s in the parentheses first. 5(3)=15
But If u had a problem like 2(4x+6) then u can use the distributive property. This is bc u can’t add 4x+6 bc they aren’t like terms. So u multiple the 2 by 4x which is 8x and the 2 by 6 which is 12 then ur answer would be : 8x+12
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the number A(t) of grams of salt in the tank at a time is <em>A(t)=150-110e-t/50</em>

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A contractor buys 16 and 3/10 tons of sand and uses 8 and 4/5 tons.how much sand is left?
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The annual energy consumption of the town where Camilla lives increases at a rate that is proportional at any time to the energy
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Answer:

The town's annual energy consumption will be of 6.57 trillons of BTU after 9 years.

Step-by-step explanation:

The annual energy consumption of the town where Camilla lives increases at a rate that is proportional at any time to the energy consumption at that time.

This means that the consumption after t years is given by the following differential equation:

\frac{dC}{dt} = kC

In which k is the growth rate.

The solution is, applying separation of variables:

C(t) = C(0)e^{kt}

In which C(0) is the initial consumption.

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This means that C(0) = 4.4

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C(t) = C(0)e^{kt}

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5.5 trillion BTUs annually after 5 years.

This means that C(5) = 5.5. We use this to find k. So

C(t) = 4.4e^{kt}

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e^{5k} = 1.25

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5k = \ln{1.25}

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The town's annual energy consumption will be of 6.57 trillons of BTU after 9 years.

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