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Flura [38]
2 years ago
8

How do you write 3.9 × 103 in standard form?

Mathematics
2 answers:
Luden [163]2 years ago
7 0
3.9 x 103 is 401.7
answer,
4.017 x 10^2
Ierofanga [76]2 years ago
4 0

Answer:

3.9 x (1.03×10^2) or 4.017 x 10^2

Step-by-step explanation:

3.9 x 103 can be written in standard form to:

3.9 x (1.03×10^2).

If you also wanted to solve the equation, the answer would be:

4.017 x 10^2

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What is the answer to the equation 4a+26-9a-17=26?
podryga [215]
First you have to put all of your common numbers together. 4a and 9a go together. You then subtract those because 9 is negative (-9). Then you get -5a. Now move on to your other numbers. You have 26 and 17. 17 is negative as well (-17), so you subtract it from 26. That gives you 9.
Your new equation is -5a + 9 = 26
Now you subtract 9 from both sides. Your positive (+9) will cancel out with your negative (-9). Then subtract it from 26. 9 minus 26 is 17. 
Now your equation is -5a = 17
Since it's negative, you're going to add it (5) to both sides. 
Your 5's cancel out, and 17 + 5 is 22. 
a = 22
22 is the answer 

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3 years ago
Billy drove 1 half of the 7.5 miles between his house and the mall. How many miles did he drive?
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Billy drove 3.75 miles. You find the answer by dividing 7.5 by 2
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Math question. Please have your answer simplified and in fraction form if needed.
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Step-by-step explanation:

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3 years ago
The perimeter of the rectangle she below is 24feet
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Round final answers to 3 decimal places.
irina [24]

There are 651.335 million cells in the petri dish after 11 hours and the cells will reach 1 billion cells after 14.068 hours

<h3>How to determine the number of cells after 11 hours?</h3>

The given parameters are:

At t = 0, Bacteria = 140 million

At t = 6, Bacteria = 320 million

This can be represented as:

f(0) = 140

f(6) = 320

An exponential function is represented as:

f(t) = f(0) * r^t

When t = 6, we have:

320 = 140 * r^6

Divide both sides by 140

r^6 = 2.28571428571

Take the 6th root of both sides

r = 1.15

So, we have:

f(t) = f(0) * 1.15^t

Substitute f(0) = 140

f(t) = 140 * 1.15^t

After 11 hours, we have:

f(11) = 140 * 1.15^11

Evaluate

f(11) = 651.33

Hence, there are 651.335 million cells in the petri dish after 11 hours

Time to reach 1 billion cells

This means that

f(t) = 1 billion i.e. 1000 million

So, we have:

1000 = 140 * 1.15^t

Divide by 140

1.15^t = 7.14285714286

Take the logarithm of both sides

t * log(1.15) = log(7.14285714286)

Divide both sides by log(1.15)

t = 14.068

Hence, the cells will reach 1 billion cells after 14.068 hours

Read more about exponential functions at:

brainly.com/question/2456547

#SPJ1

6 0
2 years ago
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