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3 years ago

can someone explain scientific notation to me? i dont know if this would be a right question but i need it to be explained

Mathematics

1 answer:

Nikitich [7]3 years ago

8 0

Answer:

In step by step explanation

Step-by-step explanation:

Move your decimal until you have one non-zero number left of your deciaml point the number of times you moved you decimal to the left will be the exponent you put attached to a ten.

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How many pairs of whole numbers have a sum of 40

Alex

For the writer, there are 20
1. 1 + 39 = 40 
2. 2 + 38 = 40
3. 3 + 37 = 40
4. 4 + 36 = 40 
5. 5 + 35 = 40 
6. 6 + 34 = 40
7. 7 + 33 = 40
8. 8 + 32 = 40 
9. 9 + 31 = 40
10. 10 + 30 = 40 
11. 11 + 29 = 40 
12. 12 + 28 = 40
13. 13 + 27 = 40 
14. 14 + 26 = 40 
15. 15 + 25 = 40 
16. 16 + 24 = 40 
17. 17 + 23 = 40 
18. 18 + 22 = 40 
19. 19 + 21 = 40 
20. 20 + 20 = 40

5 0

3 years ago

300 ml over 15 min is what rate of ml per hour

Mama L [17]

Answer:

1200 ml per hour

Step-by-step explanation:

To compute what rate is 300 ml over 15 mins as a rate of ml per hour, we do a rule of 3, using a variable x as that amount of ml we don't know yet. We should have everything in the same units, so instead of writing 1 hour we write 60 minutes:

$\frac{300~ml}{15~min}=\frac{x~ml}{60~mins}$

Now we solve for x:

$\frac{300~ml}{15~min}\cdot 60~mins=x~ml$

$\frac{18000~ml}{15} =x~ml$

$1200~ml =x~ml$

And so, now that we know the value of x, the rate we wanted to find is

$\frac{1200~ml}{60~mins}$

Which is just 1200 ml per hour.

3 0

3 years ago

6) Write an expression that is equivalent to 3(7 + x). 3(7+ x) =___ +___ ?

sergejj [24]

Answer:

21 + 3x

Step-by-step explanation:

hope this helps

6 0

3 years ago

W^2+4w+4/2w^2-8 Simplify the expression

4vir4ik [10]

The answer would be
$3w {}^{2} + 4w - 8$
hope I helped

7 0

3 years ago

Read 2 more answers

Jones has a 100-acre farm. he sells it to a developer who is going to build houses. the developer will use 10% of the land for s

Sholpan [36]

The first thing we must do is find the amount of land that will be used for the 120 lots.
We must remember that 10% of the land will not be used for the lots.
We have then:
$100 - (0.10) * (100) = 100 - 10 = 90 acres.
$
Then, we must consider the following conversion of units:
$1 acre = 43560 ft ^ 2
$
Applying the conversion we have:
$(90) * (43560) = 3920400 ft ^ 2
$
Then, the amount of square feet for each lot is given by:
$3920400/120 = 32670 ft ^ 2
$
Answer:
There will be 32670 square feet in each lot.

6 0

4 years ago