To begin a bacteria study, a petri dish had 2300 bacteria cells. Each hour since, the number of cells has increased by 7.2%.
Lett be the number of hours since the start of the study. Let y be the number of bacteria cells.
Write an exponential function showing the relationship between y and t.
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Step-by-step explanation:

The exponential growth equation : , where A=initial value, r= rate of growth , t= time.

Given: A = 2300,  r= 7.2% = 0.072  

Let t be the number of hours since the start of the study. Let y be the number of bacteria cells.

then, the exponential function showing the relationship between y and t will be:

hello,

b) 62.47% of the students are between 14 and 18 years old.

step-by-step explanation:

mean = 15 and standard deviation = 2

student between 14 to 18

formula used z-score

for age 14 , z score

using z-table , p(z> -0.5)=0.3085

for age 18 , z score

using z-table , p(z< 1.5)=0.9332

p(-0.5< z< 1.5)=0.9332-0.3085 = 0.6247

thus, 62.47% of the students are between 14 and 18 years old.

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step-by-step explanation:

the answer is d

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