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3 years ago

What is a mathematical statement taken as fact

Mathematics

2 answers:

Maru [420]3 years ago

7 0

In mathematics, a conjecture is a mathematical statement which appears to be true

Firdavs [7]3 years ago

3 0

Answer:

conjecture

Step-by-step explanation:

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eva is working two summer jobs, making $9 per hour landscaping and $14 per hour clearing tables. Last week eva earned a total of

Mariulka [41]

so she makes $23 each hour because 9+14=23
last week she earned a total of $74? and worked as twice as many hours..ok so she worked about 3 hours last week

4 0

3 years ago

PLS HELP!!!!<br> Why are the x-values nonnegative ?

nataly862011 [7]

Answer:

Because the slope is going up and not down?

Step-by-step explanation:

7 0

3 years ago

Read 2 more answers

if there are 200 questions and 4 marks for correct answers and -1 for incorrect answer and total marks is 250then what is the nu

Zanzabum

The number of questions answered correctly = 90.

<h3>What is a system of linear equations?</h3>

A system of linear equations is a set of two or more linear equations.
Linear equations refer to the equations that involve two or more variables in the form of "ax + b".

Now,

Given:

Total number of questions = 200
Marks for correct answer = 4
Marks for incorrect answer = -1
Total marks = 250

To find : Number of correct answers = ?

Finding:

Now, assuming that the student attempted and answered all the questions,

Let the number of questions correctly answered be x and incorrectly answered be y.

Then,

x + y = 200 (For number of questions) (eqn 1)
and 4x - y = 250 (For the marks scored) (eqn 2)

Solving the system of linear equations:

For eqn 2, we get that y = 4x - 250

Substituting in eqn 1, we get:

=> x + 4x - 250 = 200

=> 5x = 250 + 200 = 450

=> x = 90

That is, the number of questions answered correctly = 90, the incorrect answers = 200 - 90 = 110.

To learn more about system of linear equations, refer to the link: brainly.com/question/2226590

#SPJ4

8 0

1 year ago

Sally gets a cup of coffee and a muffin every day for breakfast from one of the many coffee shops in her neighborhood. She picks

aniked [119]

Answer:

<u>A. Mean of the amount Sally spends on breakfast daily = $ 3.90</u>

<u>Standard deviation of the amount Sally spends on breakfast daily = $ 0.34 (rounding to the next cent)</u>

<u>B. Mean of the amount Sally spends on breakfast weekly = $ 27.30</u>

<u>Standard deviation of the amount Sally spends on breakfast weekly = $ 0.89 (rounding to the next cent)</u>

Step-by-step explanation:

1. Let's review the information given to us to answer the question correctly:

Average price of a cup of coffee = $ 1.40

Standard deviation = $0.30

Average price of a muffin = $ 2.50

Standard deviation = $ 0.15

The two prices are independent of each other

2. What is the mean and standard deviation of the amount Sally spends on breakfast daily?

Let's recall that:

1. The mean of the sum of two independent variables is the sum of their means.

2. The variance of the sum of two independent variables is equal to the sum of their variances.

Therefore,

Mean of the amount Sally spends on breakfast daily = Average price of a cup of coffee + Average price of a muffin

Replacing with the values we know:

Mean of the amount Sally spends on breakfast daily = 1.40 + 2.50

Mean of the amount Sally spends on breakfast daily = $ 3.90

Variance of the amount Sally spends on breakfast daily = Variance of the price of a cup of coffee + Variance of the price of a muffin

Replacing with the values we know:

Variance of the amount Sally spends on breakfast daily = 0.30² + 0.15²

Variance of the amount Sally spends on breakfast daily = 0.1125

Standard deviation of the amount Sally spends on breakfast daily = √0.1125

Standard deviation of the amount Sally spends on breakfast daily = $ 0.34 (rounding to the next cent)

3. What is the mean and standard deviation of the amount she spends on breakfast weekly (7 days)?

Mean of the amount Sally spends on breakfast weekly = 7 * Mean of the amount Sally spends on breakfast daily

Mean of the amount Sally spends on breakfast weekly = 7 * 3.90

Mean of the amount Sally spends on breakfast weekly = $ 27.30

Variance of the amount Sally spends on breakfast weekly = 7 * Variance of the amount Sally spends on breakfast daily

Variance of the amount Sally spends on breakfast weekly = 7 * 0.1125

Variance of the amount Sally spends on breakfast weekly = 0.7875

Standard deviation of the amount Sally spends on breakfast weekly = √0.7875

Standard deviation of the amount Sally spends on breakfast weekly = $ 0.89 (rounding to the next cent)

3 0

4 years ago

If I was asked to think of a number and multiply it by 2, I could

finlep [7]

Answer:

4(2x-3)

Step-by-step explanation:

4 0

3 years ago

Read 2 more answers