What is the reciprocal of -3 2/7 ? -3 7/2 -23/7 -7/23 3 2/7
2 answers:
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Answer:
So in blanks there will be 8, 9, 4, 3
Step-by-step explanation:
We have given that
We have to fill the blanks
We know that
When we add all then
So in the blanks there will be 8 , 9, 4 , 3
We also know that
So
Answer:
This situations represents the depth of the lake after t years.
The rate of decay is equal to 0.02 a year.
So the depth of the lake each year is 0.98 times the depth in the previous year.
It will take 5.77 years for the depth of the lake to reach 26.7 meters.
Step-by-step explanation:
Exponential equation of decay:
The exponential equation for the decay of an amount is given by:
In which D(0) is the initial amount and r is the decay rate, as a decimal.
A lake currently has a depth of 30 meters. As sediment builds up in the lake, its depth decreases by 2% per year.
This means that
So
This situation represents
The depth of the lake after t years.
The rate of growth or decay, r, is equal to
The rate of decay is equal to 0.02 a year.
So the depth of the lake each year is times the depth in the previous year.
1 - 0.02 = 0.9
So the depth of the lake each year is 0.98 times the depth in the previous year.
It will take between years for the depth of the lake to reach 26.7 meters.
This is t for which D(t) = 26.7. So
It will take 5.77 years for the depth of the lake to reach 26.7 meters.