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ValentinkaMS [17]
3 years ago
5

The sum of the digits of a two-digit

Mathematics
1 answer:
Ann [662]3 years ago
6 0

Answer:

45

Step-by-step explanation:

Let the unit place be ‘x'

Tenth place be y

The number is 10y+x

x+y = 9 (according to the condition) (1)

Digits are interchanged Unit place' y ‘& tenth place ‘ x'

New no is 10x +y

This is 9 more than the original number

10x+ y = 10y+x +9

10x-x+y-10y = 9

9x-9y= 9

x-y = 1 (dividing by 9) (2)

Adding the two equations

2x = 10

x= 5

Substituting the value of x in first equation

y = 4

The number is 45, the original number is 54 this is 9 more of the new number.

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How many sides does a regular polygon have if one exterior angle is 1 degree
Mariulka [41]

Answer:

The number of sides are 360

Step-by-step explanation:

We are given

exterior angle is 1 degree

Firstly, we will find interior angle

interior angle = 180 - exterior angle

we can plug value

interior angle = 180 - 1

interior angle = 179

now, we can use formula

\frac{180(n-2)}{n}=\theta

now, we can plug angle

\frac{180(n-2)}{n}=179

now, we can solve for n

180\left(n-2\right)=179n

180n=179n+360

n=360

So,

The number of sides are 360


5 0
3 years ago
Susan runs 22 km in 2 hours and 45 minutes. What is her average speed in km an hour?
12345 [234]

Answer:

4.97097

Step-by-step explanation:

3 0
3 years ago
Read 2 more answers
For each decimal, find two integers closest to it. 11.6. | < 11.6< <​
Oksanka [162]

The decimal number 11.6 is to one decimal place, and the closest integers to 11.6 are 11 and 12

<h3>How to determine the closest integer?</h3>

The decimal number is given as:

11.6

The above decimal number is between the digits 11 and 12

This means that the closest integers to 11.6 are 11 and 12

Read more about decimal at:

brainly.com/question/11406179

8 0
3 years ago
Erica earned a total of $50,450 last year from her two jobs. The amount she earned from her job at the store was $1,250 more tha
Mariana [72]

Erica earned a total of $50,450 last year from her two jobs. The amount she earned from her job at the store was $1,250 more than four times the amount she earned from her job at the college.

Lets x be the amount she earned from here job at college

amount she earned at the store = 4 * amount earned at college + 1250

= 4x + 1250

Amount earned at college + amount earned at store = 50450

x + 4x + 1250 = 50450

5x + 1250 = 50450

Subtract 1250 from both sides

5x = 49200 (divide by 5)

x = 9840

she earn $9840 from her job at the college

5 0
3 years ago
Which line has a positive slope?
Fiesta28 [93]
The correct answer is A because the line goes down left and up right.....choice B is a horizontal line which means it has a zero slope......choice C is a negative slope because it goes down right and up left.
6 0
4 years ago
Read 2 more answers
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