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Andre45 [30]
2 years ago
13

Ultiple Choice

Mathematics
1 answer:
gulaghasi [49]2 years ago
8 0

Answer:

4 12

3 18

5 20

7 42

5 15

Step-by-step explanation:

all of the above form a proportion

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The scale on a map that 5 centimeters = 2 kilometers
spin [16.1K]
So that is what we call a ratio and it looks like this
\frac{5cm}{2km} \\
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3 years ago
What is “The sum of a number of 6” as an algebraic expression. <br><br> HURRY PLEASE
lions [1.4K]

Answer:

This question makes no sense but here we go:

Step-by-step explanation:

Assuming the sum must be equal to six:

x+y = 6

Comment if i'm getting the wrong idea, this question makes like no sense to me. Perhaps a grammatical error?

3 0
2 years ago
A standardized​ exam's scores are normally distributed. In a recent​ year, the mean test score was 14901490 and the standard dev
kicyunya [14]
<h2>Answer with explanation:</h2>

Given : A standardized​ exam's scores are normally distributed.

Mean test score : \mu=1490

Standard deviation : \sigma=320

Let x be the random variable that represents the scores of students .

z-score : z=\dfrac{x-\mu}{\sigma}

We know that generally , z-scores lower than -1.96 or higher than 1.96 are considered unusual .

For x= 1900

z=\dfrac{1900-1490}{320}\approx1.28

Since it lies between -1.96 and 1.96 , thus it is not unusual.

For x= 1240

z=\dfrac{1240-1490}{320}\approx-0.78

Since it lies between -1.96 and 1.96 , thus it is not unusual.

For x= 2190

z=\dfrac{2190-1490}{320}\approx2.19

Since it is greater than 1.96 , thus it is unusual.

For x= 1240

z=\dfrac{1370-1490}{320}\approx-0.38

Since it lies between -1.96 and 1.96 , thus it is not unusual.

5 0
3 years ago
what is the equation of the line that passes through the point (3,5) and is it parallel to the line y= - 2x+3
Alekssandra [29.7K]
I believe the answer is (-1,-3)
3 0
3 years ago
Laura collects nickels and dimes she has a total of 47 nickels and dimes she calculated the value of the coins and found out she
Gre4nikov [31]

Answer:

Number of dimes = 34

Number of nickels = 13

Step-by-step explanation:

Total number of coins = 47

Coins are in the form of nickels and dimes.

Value of a nickel = 5 cents

Value of a dime = 10 cents

Total value of coins = $4.05 or 405 cents

To find:

Number of nickels and dimes?

Solution:

Let number of nickels = x

Money value of nickels = 5x

Let number of dimes = y

Money value of dimes = 10y

Total value of coins = 5x+10y

This value is given as equal as 405.

As per question statement, the equations can be written as:

5x+10y = 405 ..... (1)\\x+ y = 47 ...... (2)

Multiplying equation (2) with 5 and subtracting from equation (1):

10y - 5y = 405 - 235  \\\Rightarrow 5y = 170\\\Rightarrow y = 34

Number of dimes = 34

Number of nickels  = 47 - 34 = 13

6 0
2 years ago
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