Why do scientists use models?
A)
Models are unreliable.
B)
Models waste natural resources.
Models predict not just describe events.
Models are based on scientific laws and principals so they are more
reliable than the real thing.
D)

Answers

Answer 1
The correct answer is A

Related Questions

What is the discriminate?

Answers

so it’s basically asking for the difference

round 17 21/30 to the nearest whole number

Answers

Answer:

i think 18

Step-by-step explanation:

dont come at me if im wrong

HELP WILL MARK BRAINLIEST

Answers

Answer:

D

Step-by-step explanation:

Answer: it would be d

Step-by-step explanation:

Russia's currency is called the ruble, and is denoted with this symbol: Rub. An electrical contractor has Rub850,360 in his business's bank account.If at the end of the week he deposits Rub119,980 in payments made from clients and then pays out Rub79,205 in wages, how much money will he have left in his account?

Answers

Answer:

He will

have RUB 891,135 present to the same government

Step-by-step explanation:

Here, we want to calculate the amount of money that will be left in the account

To get this, we simply subtract the payments and add up the deposits to the initial

Thus, we have;

850,360 + 119,980 - 79,205 = 891,135

Answer Both Questions

Frankiln are 3/4 of an energy bar before his baseball game. Trey ate 2/3 of what Franklin ate. What fraction of an energy bar did Trey eat?


Colin was helping his uncle clean up a construction site. Colin's job was to make a neat stack of scrap wood. Each piece of wood was 1 3/8 inches thick. At the end if the day, Colin's stack was 57 3/4 inches tall. How many pieces of wood were in Colin's stack?

Answers

Answer:

a) 1/2 of an energy bar

b) 42 pieces

Step-by-step explanation:

a) Here, Franklin are 3/4 of an energy bar while Trey are 2/3 of what Franklin ate

The fraction are by Trey is 2/3 * 3/4 = 6/12 = 1/2

b) To find the number of pieces of wood present, we will need to divide the height of Colin’s stack by the thickness of each piece of wood

Mathematically, that will be;

57 3/4 divided by 1 3/8

= 231/4 * 8/11 = 42 pieces

Answer:

kejorrerprpfffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff

Please I needddd helppp is it correct or do I need to change something

Answers

Your correct they are in the right spots

The library at school is organized by fiction and non-fiction books. There are 3 non-fiction books for every 7 fiction books. How many total books are there if the library has 240 non-fiction books?

Answers

Answer:

Total = 800 books

Step-by-step explanation:

It is given that,

In a library, there are 3 non-fiction books for every 7 fiction books. It means that the ratio of non-fiction books to the fiction books is 3:7.

There if the library has 240 non-fiction books.

Let non fiction books are 3x and fiction books are 7x.

ATQ,

3x=240

x=80

Fiction books = 7x = 7(80) = 560

Total no of books = fiction books + non-fiction books

= 240 + 560

=800

Hence, the total no of books are 800.

AQRS contains the points: Q (4,2) R (5.1) S (3.7). If the triangle is reflected across the y-axis, what will she?

Answers

Answer:

The answer is (-3, 7) hope this helps

Step-by-step explanation:

Answer:If it's reflected,then it should be (-3.7).

Step-by-step explanation:

70% off
original price!
Abdul wants to buy a cat calendar. The original price is $5.30. What is the sale price?
I need this worked out please

Answers

Answer:

the price with the offer is going to be 1.59$

Step-by-step explanation:

[tex] \frac{x}{5.30} = \frac{70}{100} [/tex]

[tex]100(x) = 70(5.30)[/tex]

[tex]100(x) = 371[/tex]

[tex] \frac{100(x)}{100} = \frac{371}{100} [/tex]

[tex]x = 3.71[/tex]

[tex]70\% \: \: \: of \: \: \: 5.30 \: \: \: is \: \: \: 3.71[/tex]

[tex]5.30 - 3.71 = 1.59[/tex]

ONLY ANSWER IF YOU HAVE SOLUTION OR ELSE U WILL BE REPORTED!
50% people use cellular mobile and 40% people use landline and 20% people use both. Find the probability that a person selected at random use neither.
a) 10% b) 30%
c) 70% d) 90%

Answers

Answer:

a) 10%

Step-by-step explanation:

To be able to own both (20%), you must fall into both categories. You own a cellular mobile, and you own a landline. The 20% is within the 50% + 40%.

50% + 40% = 90%

Subtract 90% from the total amount:

100 - 90 = 10

A) 10% is your answer.

~

What is the slope of a line with points -5,7 and 1,1

Answers

Answer

6/-11

Step-by-step explanation:

use the slope formula m= [tex]\frac{y 2-y 1}{x 2-x 1}[/tex]

then sub in numbers m=[tex]\frac{7-1}{-5-1}[/tex]

now subtract numerator and the denominator

[tex]7-1= 6[/tex]    and

[tex]-5-6=-11[/tex]  this now looks like  [tex]\frac{6}{-11}[/tex]    

Please help! asap ill brainlist you :(


At midnight there were 5 inches of snow on the ground. Since then, snow has been falling at the rate of ½ inch per hour. Identify the y-intercept.

Answers

Answer:

5

Step-by-step explanation:

hope this helps!!!

1620, 540, 180, 60, 20,...
Find common ratio.​

Answers

Answer:

multiplying by 3

Step-by-step explanation:

20x3=60 60x3=80. and the rest is the same.

3 + 27y + 15z

x + 9y + 5z​

Answers

Answer: sum

Step-by-step explanation:

Answer:

sum

Hope this helped!

Have an amazing day!

I didn’t understand how to solve this, i’d be happy if someone explained thank you

Answers

Answer:

Option (E)

Step-by-step explanation:

[tex]\frac{a}{b}=\frac{c}{d}=k[/tex]

[tex]\frac{a}{b}=k[/tex]

[tex]b=\frac{a}{k}[/tex] ------(1)

[tex]\frac{c}{d}=k[/tex]

[tex]d=\frac{c}{k}[/tex] -------(2)

Since, [tex]\frac{6a+24}{md+6b}=k[/tex]

By substituting the values of b and d from equation (1) and (2),

[tex]\frac{6a+24}{\frac{mc}{k}+\frac{6a}{k}}=k[/tex]

[tex]\frac{k(6a+24)}{6a+mc}=k[/tex]

[tex]\frac{6a+24}{6a+mc}=1[/tex]

6a + 24 = 6a + mc

mc = 24

m = [tex]\frac{24}{c}[/tex]

Therefore, Option (E) will be the correct option.

the perimeter of a isosceles triangle is 5(2+root2) find the area

Answers

Answer:

12.5

Step-by-step explanation:

If an isosceles right triangle as the length of the equal sides is  a , then the length of the hypotenuse will be  a2–√  (using pythogoras theorem.

Hence the perimeter will be  a+a+a2–√=a(2+2–√)  

Hence the equal sides of the triangle in question has the length of  a=5  

Area of the triangle  =  12∗Height∗Base  

=12∗5∗5=12.5

Is the relation shown below a function? Use the graph below to justify your response.

(0, 0), (2, 0), (2, 2), and (3, 4)

Answers

Answer:

yes it is a function there is no graph so I cant justify it

The relation is not a function.

Relations

Relations that are functions will pass the vertical line test

Points

The points are given as:

(0,0), (2,0), (2,2), and (3,4)

Graphs

Next, we plot the points on the graph (see attachment).

From the graph, we can see that a vertical line passes through points (2,0) and (2,2).

Hence, the relation is not a function.

Read more about functions and relations at:

https://brainly.com/question/2253924

MOLDY FRIJOLES!!!!!what is x+y=10

Answers

Answer:

lol......

.

..

............

What is the domain of F? Will mark brainiest

Answers

Answer:

A

Step-by-step explanation:

the dots are at -5 an 6.

the dots are closed meaning that they are equal to. -5 is less than 6 and 6 is greater than -5. so the answer should be A

The domain of F is 6

Work out (5X10^3) x (9X10^7) answer in standard form plz

Answers

Answer:

4.5×10¹¹

Answer:

[tex](5 \times 10 {}^{3} ) \times (9 \times 10 {}^{7} )[/tex]

i) use the commutative property to rearrange the terms: a+b = b+a

[tex](5 \times 9) \times (10 {}^{3} \times {10}^{7} )[/tex]

ii) multiply the number in the 1st bracket

[tex]45 \times ( {10}^{3} \times 10 {}^{7} )[/tex]

iii) multiply the 2nd bracket by adding their exponents

[tex]45 \times 10 {}^{3 + 7} [/tex]

[tex]45 \times 10 {}^{10} [/tex]

iv) write the answer in standard form

[tex]4.5 \times 10 {}^{10 + 1} [/tex]

[tex]4.5 \times {10}^{11} [/tex]

The given equation that should be in the standard form should be like a [tex]4.5\times 10^{11}[/tex].

Equation in standard form:

Since

The equation is [tex](5\times 10^3) \times (9\times 10^7)[/tex]

Now here we use the commutative property

So,

[tex]45 \times (10^3 \times 10^7)\\\\45 \times 10^{10}\\\\4.5 \times 10^{11}[/tex]

Here, we multiply the number in the 1st bracket, then add, it and then finally in standard form.

Learn more about an equation here: https://brainly.com/question/24271130

11(4-6y)+5(13y+1)=9 help​

Answers

Answer:

Y = 40

Step-by-step explanation:

44 - 66y + 65y + 5 = 9

49 - y = 9

-y = -40

y = 40

Answer:

y = 40

General Formulas and Concepts:

Pre-Algebra

Order of Operations: BPEMDAS

Brackets Parenthesis Exponents Multiplication Division Addition Subtraction Left to Right

Equality Properties

Algebra I

Combining Like Terms

Step-by-step explanation:

Step 1: Define

11(4 - 6y) + 5(13y + 1) = 9

Step 2: Solve for y

Distribute:                              44 - 66y + 65y + 5 = 9Combine like terms:             -y + 49 = 9Isolate y term:                       -y = -40Isolate y:                                y = 40

Step 3: Check

Plug in y into the original equation to verify it's a solution.

Substitute in y:                    11(4 - 6(40)) + 5(13(40) + 1) = 9Multiply:                               11(4 - 240) + 5(520 + 1) = 9Subtract/Add:                      11(-236) + 5(521) = 9Multiply:                               -2596 + 2605 = 9Add:                                     9 = 9

Here we see that 9 does indeed equal 9.

∴ y = 40 is the solution to the equation.

Engineers are planning a new bridge to cross a small river. Surveyors created the diagram to show where the bridge would cross the river. What is the distance across the river where the new bridge will be built?

Answers

Answer:

56.25 feet

Step-by-step explanation:

As per diagram, the two triangles are similar, as all angles are congruent (one is vertical, one is right, one is the

Let the distance across the river be x.

The ratio of corresponding sides is same. Find x using ratios:

x/45 = 75/60x = 45*75/60x = 56.25 feet

Answer:

56.25

Step-by-step explanation:

I took the quiz.

the crowd at a sporting event is estimated to be 2,500 people. the exact attendance is 2,486 people. what is the percentage error?

Answers

Answer:

0.56%

Step-by-step explanation:

Percentage error

[tex] = \frac{2500 - 2486}{2500} \times 100 \\ \\ = \frac{1400}{2500} \\ \\ = 0.56\%[/tex]

The crowd at a sporting event is estimated to be 2,500 people, the exact attendance is 2,486 people, the percentage error is, 0.56%

What is the percentage?

The percentage is a mathematical term, which means a number or a ratio which is represented in fractions of 100. We use the '%' symbol to represent the percentage.

Formula for percentage;

Percentage = (present quantity/whole quantity)×100

Given that,

The crowd estimated to be 2,500 people

The exact attendance is 2,486 people

Percentage error = ?

Percentage error = (estimated value- exact value)/estimated value×100

Percentage error =   (2,500 - 2,486) /2500×100

                             =  0.56%

So, the percentage error is 0.56%

To know more about Percentage check:

https://brainly.com/question/29306119

#SPJ1

Solve
Log(x-1)+log(2)=7

Answers

Answer:

x is 6 i believeee if you're solving for x!!

Step-by-step explanation:

Answer:

x = 1 + 0.5 * 10^7

Step-by-step explanation:

Use log(a) + log(b) = log(ab).

log(x-1) + log(2) = 7 <=> log(2(x-1)) = 7 <=> log(2x-2) = 7

Using log(a) = b <=> a = 10^b

log(2x-2) = 7 <=> 2x-2 = 10^7 <=> 2x = 2 + 10^7 <=> x = 1 + 0.5 * 10^7

What is the 30th term of the linear sequence below?
−5,−7,−9,−11,−13
,

Answers

a1 = -5, d = -2
Use formula: an = a1 + (n-1)d
a30 = -5 + (30-1)(-2)
a30 = -5 + (-38)
a30 = -63
The 30th term should be -63

A survey was conducted of students at a high school and at a college to determine students' favorite subjects. The results are shown in the table.
History Math Science Total
High School 80 50 70 200
College 70
60
70 200
Total 150 110 140 400
What percentage of the students are college students that prefer history?
O A. 17.5%
OB. 35%
OC. 37.5%
D. 46.7%
E 75%

Answers

Answer: 35%

Step-by-step explanation:

What is the slope intercept form for the equation that has these two points (5,-6) and (15,-10)

Answers

Answer:

Y = -2/5x - 4

Step-by-step explanation:

Hope this helps. Pls give brainliest.

Your friends and you go to Olive Garden for dinner. You all spend $55.65. You all leave a 15% tip. How much tip did you all leave?

Answers

Answer: You and your friends spent $8.35 for tips.

Step-by-step explanation:

6 of 12
Write in index form
(-4) × (-4) × (-4) x (-4) × (-4) x (-4)

Answers

Given:

The expression is

[tex](-4)\times (-4)\times (-4)\times (-4)\times (-4)\times (-4)[/tex]

To find:

The index form of given expression.

Solution:

Index form is the exponent form, it means, the number is represented in power of a number.

We have,

[tex](-4)\times (-4)\times (-4)\times (-4)\times (-4)\times (-4)[/tex]

Here, we have 6 times -4. So, we get -4 as base and 6 as index or exponent.

[tex](-4)\times (-4)\times (-4)\times (-4)\times (-4)\times (-4)=(-4)^6[/tex]

Therefore, the index form of given expression is [tex](-4)^6[/tex].

PLS HELP MEEEEE 1. An Amazon packaging plant can ship 315 packages in 7 hours. What is the constant of
proportionality that relates the number of packages shipped, y, to the number of hours, x?
22
45
0
7.
O
315

Answers

45 packages are shipped in one hour. I divided 315 by 7

I have attached your answer

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