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4 years ago

Why do scientists use scientific notation science

1 answer:

5 0

Because it makes quantities with a lot of digits small enough that you can do math with them.

example:
say you measure a wavelength in nanometers which is common for wavelengths but then have to use this quantity in an equation with the speed of light; 300,000,000 m/s ..
You then must convert one of these quantities to get both in the same units of measure. Usually you would write 600 nm as 6x10^11 m instead of a 12 digit decimal and speed of light as 3x10^8 m/s

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HELP PLEASE THANK U

Solnce55 [7]

This is just my guess but I want to say no they are not similar because the first 10 + 5 = 15
8 + 5 = 13 not 12
To make it similar, 8 needs to be 7. This is ONLY my guess, I’m not 100% confident in my answer

5 0

3 years ago

What is -3x^2-4x-4=0

ss7ja [257]

Answer:

<h2>no real solution</h2>

Step-by-step explanation:

$-3x^2-4x-4=0\qquad\text{change the signs}\\\\3x^2+4x+4=0\\\\\text{use the quadratic formula:}\\\\\text{for}\ ax^2+bx+c=0\\\\\text{if}\ b^2-4ac0,\ \text{then an equation has two solutions:}\ x=\dfrac{-b\pm\sqrt{b^2-4ac}}{2a}$

$\text{We have}\ a=3,\ b=4,\ c=4.\\\\\text{Substitute:}\\\\b^2-4ac=4^2-4(3)(4)=16-48=-32$

8 0

4 years ago

What is the answer to -3z > -4.5 ?

Pani-rosa [81]

Answer:

z<1.5

Step-by-step explanation:

3 0

3 years ago

What is between 68 2/3 and 72 1/2

g100num [7]

We need answer choices

8 0

4 years ago

Read 2 more answers

Help please here is a picture:

Ivahew [28]

Answer:

Step-by-step explanation:

<u>Mixed Fractions</u>

Mixed fractions are made of an integer part followed by a proper fraction.

Some examples of mixed fractions are:

3 1/2, -4 5/8, 2 2/3

Between two consecutive integers a and a+1, there are infinitely many fractions. The centered number is a 1/2. Any number with its improper fraction part less than 1/2 is closer to a than to a+1.

In our problem, Jayne bought between 2 and 3 pounds of granola. We need to provide a mixed number that is closer to 2 pounds than to 3 pounds.

We can select any number with integer part 2 and a proper fraction less than 1/2.

Examples could be :

2 1/3, 2 1/4, 2 3/7

All of them are less than 2.5

6 0

3 years ago