3 years ago

1. Find the value of the expression.6 = 4[3(5 - 8) + 6] + 7

Mathematics

1 answer:

Art [367]3 years ago

5 0

Answer:

Step-by-step explanation:

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Answer:

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Step-by-step explanation:

5p+3p+(-9)

Combine like terms

8p -9

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At the beginning of an environmental study, a forest covered an area of 1500 km2 . Since then, this area has decreased by 9.8% e

fredd [130]

Answer:

$A(t)=(0.902)^t \cdot 1500$ $[km^2]$

Step-by-step explanation:

In this problem, the initial area of the forest at time t = 0 is

$A_0 = 1500 km^2$

After every year, the area of the forest decreases by 9.8%: this means that the area of the forest every year is (100%-9.8%=90.2%) of the area of the previous year.

So for instance, after 1 year, the area is

$A_1 = A_0 \cdot \frac{90.2}{100}=0.902 A_0$

After 2 years,

$A_2=0.902 A_1 = 0.902(0.902A_0)=(0.902)^2 A_0$

And so on. So, after t years, the area of the forest will be

$A(t)=(0.902)^t A_0$

And by substituting the value of A0, we can find an explicit expression:

$A(t)=(0.902)^t \cdot 1500$ $[km^2]$

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1. Find the value of the expression.6 = 4[3(5 - 8) + 6] + 7​

1. Find the value of the expression.6 = 4[3(5 - 8) + 6] + 7