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Setler [38]
3 years ago
15

how is 0.00023 written in scientific notation? a. 23 x 10–5 b. 2.3 x 10–4 c. 2.3 x 104 d. 0.23 x 10–3

Mathematics
2 answers:
Annette [7]3 years ago
7 0

Answer: 2.3\times10^{-4}


Step-by-step explanation:

We know that Scientific notation is a way to write a very large or a very small number in the product of a decimal form of number [generally between 1 and 10] and powers of ten.

Given number : 0.00023

In scientific notation 0.00023=2.3\times\frac{1}{10000}=2.3\times10^{-4}

Therefore, In scientific notation  0.00023=2.3\times10^{-4}

LenaWriter [7]3 years ago
7 0
0.00023

Move the decimal point to the right, so it stops between 2 and 3, and the power of 10 becomes negative.

= 2.3 * 10⁻⁴

Option b.

I hope this helps.
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Complete the equation of the line through (-9 -9) and (-6 0)
Katena32 [7]

Answer:

y = 3x + 18

Step-by-step explanation:

The equation of a line in slope- intercept form is

y = mx + c ( m is the slope and c the y- intercept )

Calculate m using the slope formula

m = (y₂ - y₁ ) / (x₂ - x₁ )

with (x₁, y₁ ) = (- 9, - 9) and (x₂, y₂ ) = (- 6, 0)

m = \frac{0+9}{-6+9} = \frac{9}{3} = 3, thus

y = 3x + c ← is the partial equation of the line

To find c substitute either of the 2 points into the partial equation

Using (- 6, 0), then

0 = - 18 + c ⇒ c = 0 + 18 = 18

y = 3x + 18 ← equation of line

7 0
3 years ago
Please can u answer all the questions!!! Thank u soo much
DiKsa [7]

4.a) 2x=7*3

2x=21

x=21/2 OR

x=10.5

4.b)5x=25*6

5x=150

x=150/5

x=30

4.c)4x=5*14

4x=70

x= 70/4

x=17.5

4.d)4x=9*3

4x=27

X=27/4

X=6.75

4.e)x=0.05*3

X=0.15

4.f)x=0.25*7

X=1.75

4.g)x=0.4*1.5

X=0.6

4.h)x=0.7*2.2

X=1.54

5a)x/7=7-3

X/7=4

X=4*7

X=28

B)2x/5=3+8

2x/5=11

2x=11*5

2x=55

X=55/2

X=27.5

C)2x/3=74-26

2x/3=48

2x=48*3

2x=144

X=72

(I can’t finish all but it is the same method )

5 0
3 years ago
Margo freezes 8 cups of strawberries if this is 2/3 of the total strawberries that she picked how many cups of strawberries did
Goryan [66]

Answer:

12 cups.

Step-by-step explanation:

Let x be the total cups of strawberries picked by Margo.

We have been given that Margo freezes 8 cups of strawberries and this is 2/3 of the total strawberries that she picked.

We need to find x such that 2/3 of x equals 8. We can represent this information in an equation as:

\frac{2}{3}x=8

Let us multiply both sides of our equation by 3.

3*\frac{2}{3}x=3*8

2x=24

Let us divide both sides of our equation by 2.

\frac{2x}{2}=\frac{24}{2}

x=12

Therefore, Margo picked 12 cups of strawberries.

5 0
3 years ago
11 th grade algebra question 1
Zolol [24]

\huge \bf༆ Answer ༄

Here's the solution ~

{ \qquad{ \sf{ \dashrightarrow}}}  \:  \: \sf \:a_{11} × a_{22} - a_{21} × a_{12}

{ \qquad{ \sf{ \dashrightarrow}}}  \:  \: \sf \:(2  \times 4) - ( - 1 \times  - 3)

{ \qquad{ \sf{ \dashrightarrow}}}  \:  \: \sf \:8 -  3

{ \qquad{ \sf{ \dashrightarrow}}}  \:  \: \sf \:5

4 0
3 years ago
PLEASE ANSWER 18 AND 18
seraphim [82]

18 & 18.  I like it.

The square root of a natural number won't be rational unless the number is a perfect square.  So not a and not b but yes to C.

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OK, onto 18.

The square root of 12 is irrational so has a nonterminating, nonrepeating decimal expansion.

7/8 has a finite decimal expansion, 0.875.   When the reduced denominator doesn't have any prime factors besides 2 and 5 we'll get a finite decimal expansion.  Answer: b

5/11 has 11 as a factor in the denominator, so is an infinite repeating decimal.

I'll guess there's three dots after 0.81818181 so that one doesn't terminate either.

---------

Bonus

0.21 rational, equal to 21/100

3/12 rational, it's the ratio of integers

√12 - 2 is irrational because of the √12

4.125... can't really tell because the ... may hide a repeating or nonrepeating part.


4 0
3 years ago
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