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Alexus [3.1K]
3 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]3 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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In a study of automobile collision insurance costs, a random sample of n = 35 repair costs of front-end damage caused by hitting
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For 98% confidence  , the significance level = 1-0.98=0.02

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4 0
3 years ago
A positive integer is 11 more than 18 times another. Their product is 6030. Find the two integers.
allsm [11]

Answer:

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18x + 335 = 0                 x - 18 = 0

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x = -335/18

x is gonna have to be a positive number...so x = 18

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so ur numbers are 18 and 335

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