A line whose slope is 4 and passes through the point (0, -9) lies on the line whose equation is:

Mathematics

1 answer:

Svet_ta [14]3 years ago

6 0

You should use point-slope form: y-y1 = m(x-x1)

y+9 = 4(x)
y-4x=-9
4x-y=9 (B)

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Marco starts with a population of 10 bacteria that doubles every day for a number of days, d. He writes the expression 10(2d) to

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Answer:

Marco- 10 is the starting value of the population. 2 is the growth rate of "double each day" with d as an exponent.

Isabella- 1 is the starting population. 1+0.2=1.2 is the rate at which it grows each day.

Step-by-step explanation:

Marco's equation should be $10(2^{d})$ since the bacteria double each day. 10 is the starting value of the population. 2 is the growth rate of "double each day" with d as an exponent. This will double each day because:

Day 1 is $2^{1}=2$

Day 2 is $2^{2}=4$

Day 3 is $2^{3}=8$

Day 4 is $2^{4}=16$

You'll notice the value doubles each day.

Isabella has a different equation because her population increases by a percentage. We use the simple interest formula to calculate the bacteria's daily increase or interest.

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1 is the starting population.

1+0.2=1.2 is the rate at which it grows each day.

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