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jek_recluse [69]
3 years ago
9

The population of a bacteria after x number of hours is modeled by the expression 1 , 000 ( 0 . 75 ) x . What is the rate of dec

ay of the population of bacteria? A. 25% B. 75% C. 0.75% D. 1.25%
Mathematics
2 answers:
DerKrebs [107]3 years ago
7 0

Answer:

A. 25%

Step-by-step explanation:

If you multiply something by 0.75, you're multiplying it by 75%, and that means you're losing 25% each time, so the rate of decay is 25%

Afina-wow [57]3 years ago
4 0

Answer:

A 25%

Step-by-step explanation

the first thing we want to do for this problem is look at the exponential decay formula. its y=a(1-b)^x. "y" represents the final amount, "a" represents the original amount, and "b" represents the decay factor.

in this situation, .75 is the decay factor and our original amount is 1000. so to find out the decay factor, we need to subtract .75 from 1. you would get .25. .25 in percentage form is 25%.

we can double check by putting .25 in the orginal exponential decay formula. y=1000(1-.25)^x. 1-.25 equals .75, so now the equation is the same as our original equation, y=1000(0.75)^x

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Step-by-step explanation:

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A train travels 250 miles at a constant speed (x), in miles per hour.Enter an equation that can be used to find the speed of the
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The first thing we must do for this case is to take into account the following variable:
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3 years ago
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iren2701 [21]

Answer:

1 / 9

Step-by-step explanation:

P(Green) = 5 / 10

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3 0
3 years ago
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You stand 100’ from the base of a tower. The tower is 1,058’ tall. What is the angle from where you are standing to the top of t
hodyreva [135]

Answer: 85°


Step-by-step explanation:

Trig functions are remembered by


SOD CAD TOA,


sin = opposite / distance, cos = adjacent / distance, and tan = opposite / adjacent.


Here we have the adjacent side = 100, opposite side = 1058. The tower would fall over if it weren't vertical, and we assume the area is flat and level. So tangent of the answer is 10.58.


We need the angle whose tangent is 10.58.

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Daniel [21]

Answer:

the answer to that would be y=3x-9

6 0
2 years ago
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