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Alex777 [14]
3 years ago
7

What is the smallest whole number that is equal to seven times the sum of its digits?

Mathematics
2 answers:
Morgarella [4.7K]3 years ago
5 0

Answer:

21

Step-by-step explanation:

DochEvi [55]3 years ago
5 0
21.

Explanation:

The two-digit number ab stands for 10a + b since the first digit represents 10s and the second represents units. If 10a + b = 7(a + b), then 10a + b = 7a + 7b, and so 3a = 6b, or, more simply, a = 2b. That is, the second digit must be twice the first. The smallest such number is 21.
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Sindrei [870]
So,

First you have to distribute the numbers outside of the parentheses (you multiply them with the numbers inside of the parentheses

-18+(-9a) + 8a +36=11
Then collect like terms
18-1a =11
 -18    -18
---------------------
-1a=-7
Divide both sides by -1
a=7




8 0
3 years ago
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Answer:

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Step-by-step explanation:

1 - 1/4 + 2/5 = 23/20

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3 years ago
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BlackZzzverrR [31]

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Step-by-step explanation:

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8 0
3 years ago
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Can someone help me with these 2
frosja888 [35]

Answer:

Step-by-step Yes it is, assuming we decide to use the Pythagorean Theorem to find the hypotenuse (10) it'll be possible considering the formula is c²=√a²+b²

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