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4 years ago

What is 0.000000986 in scientific notation? ____x10---

2 answers:

8 0

It's going to be a negative exponent, since the number is less that 1.
move the decimal to where 986 is more than one but less that 10.
9.86X10^-7

Lilit [14]4 years ago

3 0

$0.000000986 = 986 \times 10^{-9}=\boxed{ 9.86 \times 10^{-7}}$

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Which expression is a difference of cubes?<br> O X6-6<br> O X6-8<br> O x8-6<br> O x8-8

UkoKoshka [18]

Answer:

$x^{6}$ - 8

Step-by-step explanation:

A difference of cubes has the form

a³ - b³

Note that $x^{6}$ is a perfect cube, that is $(x^2)^{3}$ , but

$x^{8}$ is not

8 is a perfect cube, that is 2³ , but 6 is not

Thus

$x^{6}$ - 8 ← is a difference of cubes

= $(x^2)^{3}$ - 2³

4 0

3 years ago

Read 2 more answers

Select all the numbers that are irrational

NARA [144]

<h3>2 Answers:</h3>

A) $-\sqrt{5}$

D) $\pi$

===========================================

Explanation:

Choices B and C are rational because we can simplify them to form a fraction of integers.

$-\sqrt{49} = -7 = -\frac{7}{1}$

$\sqrt{0} = 0 = \frac{0}{1}$

Any rational number is of the form P/Q where P,Q are integers and Q is nonzero.

So we can rule out choices B and C.

---------------

Choice A on the other hand cannot be written as a fraction of integers. The 5 isn't a perfect square, which makes $-\sqrt{5}$ irrational.

The same can be said about $\pi$ which is roughly equal to 3.14; the decimal digits go on forever without a known pattern.

Choice A and choice D are the two answers.

----------------

If we know the pattern of the decimal digits, then we can turn the decimal number into a fraction of integers

The number -0.777, where the 7s go on forever, converts to the fraction -7/9

That means we rule out choice E.

6 0

3 years ago

What is 4.51 • 3.4 I need to know for a test

Brrunno [24]

Should be 15.334. your welcome

8 0

3 years ago

In an arithmetic sequence, t7 =23 and t13=138

weeeeeb [17]

Answer:a1= -92

d=19.2

a50= 848.8

Step-by-step explanation:

8 0

3 years ago

I need help with these................

larisa [96]

Answer:

(5,4)

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3 0

3 years ago