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Alexus [3.1K]
4 years ago
5

Write the statement for the problem in mathematical language. Use x for the tens digit and y for the unit digits in the two digi

t numbers. Find the two-digit number which is 2 times the sum of its digits
Mathematics
1 answer:
Nutka1998 [239]4 years ago
8 0

Answer:

  18

Step-by-step explanation:

A two-digit number (xy) will have the value 10x+y. The sum of its digits is x+y.

You want ...

  10x +y = 2(x +y)

  1 ≤ x ≤ 9

  0 ≤ y ≤ 9

The equation can be simplified to ...

  8x = y

The only single-digit values for x and y that satisfy the requirements are ...

  x = 1, y = 8

The two-digit number of interest is 18.

_____

<em>Check</em>

Its sum of digits is 1+8 = 9. 2×9 = 18.

_____

<em>Comment on the relationship in the problem</em>

Many of us learned our multiplication tables for 9s by remembering that the sum of digits of 9n was 9, and that the leading digit of the product was n-1.

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{4.OA.A.3} There are 1,492 chairs in the auditorium. Ms. Jones wants to put them into 10 rows. If she splits the chairs evenly i
chubhunter [2.5K]

Answer:

2 chairs will be left over.

Step-by-step explanation:

Given that

There are a total of 1492 chairs.

which are to divided in 10 rows evenly.

To find:

Number of chairs left ?

Solution:

Let the number of chairs in each row = x

There are 10 rows so number of chairs in rows = 10x

Let the number of chairs left = y

Total number of chairs =10x + y  = 1492

The above equation is like:

Divisor \times Quotient + Remainder = Dividend

So, we have to find the remainder in this question where we are given Divisor and Dividend.

10 \times 149 + 2 = 1492

So, dividing 1492 with 10, we get remainder as 2.

Hence, 2 chairs will be left.

7 0
4 years ago
Write phrase as an expression: two minus y​
Marianna [84]

Step-by-step explanation:

On the verge of troll, this question is.

"Two" : 2

"minus": -

"y" : y

2-y

8 0
3 years ago
When would there be only four different equations for a set of math mountain numbers give an example
Kipish [7]
Most have only 4 different equations. 
For example, 
6+8=14
8+6=14
14-6=8
14-8=6


5 0
3 years ago
What type of costs associated with purchasing a car are determined by the state of purchase?
pychu [463]

The type of cost that is associated with the state the car was purchased is C. tax, title, and registration.

<h3>Why are these associated with the state of purchase?</h3>

Different states in the United States have different requirements for registering a car after purchase.

There are also different tax rates charged per state, and the title requirements of the car are different by state as well.

In conclusion, option C is correct.

Find out more on state taxes at brainly.com/question/25504393.

5 0
2 years ago
How many 3 letter codes are possible using a-j without repeats?
Dennis_Churaev [7]
There are 10 letters in the set {a, b, c, d, e, f, g, h, i, j} which is the pool of letters to choose from when making these three letter codes.

We have 10 choices for slot 1
Then 9 choices for slot 2. This is because we can't reuse the choice for slot 1
Then 8 choices for slot 3

Overall, there are 10*9*8 = 90*8 = 720 different permutations

Answer: 720

Note: you can use the nPr permutation formula with n = 10 and r = 3 to get the same answer
5 0
3 years ago
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