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3 years ago

This is hard I need help

Mathematics

1 answer:

Andreyy893 years ago

4 0

Answer:

140.22 ft²

Step-by-step explanation:

Surface area is the sum of areas of 4 triangles.

Each triangle has:

b = 9 ft, h = 7.79 ft

Area of each triangle:

A = 1/2bh
A = 1/2*9*7.79 = 35.055 ft²

Surface area:

S = 4*35.055 = 140.22 ft²

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Twenty less than 8 times a number is the same as 15 more than the number.

Nezavi [6.7K]

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I think you've got it from now, if not, just do 35 divided by 7. But go over the steps, so that you know how to do these types of questions.

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2 years ago

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The function in Exercise represents the rate of flow of money in dollars per year. Assume a 10-year period at 8% compounded cont

anzhelika [568]

Answer:

a) The present value is 688.64 $

b) The accumulated amount is 1532.60 $

Step-by-step explanation:

a) The preset value equation is given by this formula:

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where:

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So we have:

$P=\int^{T}_{0}(0.01t+100)e^{-rt}dt$

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The present value is 688.64 $

b) The accumulated amount of money flow formula is:

$A=e^{r\tau}\int^{T}_{0}f(t)e^{-rt}dt$

We have the same equation but whit a term that depends of τ, in our case it is 10.

So we have:

$A=e^{r\tau}\int^{T}_{0}(0.01t+100)e^{-rt}dt=e^{0.08\cdot 10}P$

$A=e^{0.08\cdot 10}688.64=1532.60 $$

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Have a nice day!

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3 years ago

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just think,

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