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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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To compare two products such as colas, a random sample is selected to taste two types of colas (A and B). Each selected subject
Nadya [2.5K]

Answer: The sample size would be needed = 385

Step-by-step explanation:

Let p be the prior population proportion.

Margin of error = E

When not estimate of p is given , the formula to calculate the minimum sample size <em>n</em> = 0.25(\dfrac{z^*}{E})^2 , where z* = critical value for given confidence interval.

Here z* for 95% confidence level is 1.96.

E=5%=0.05

Then n=0.25(\dfrac{1.96}{0.05})^2\approx385

Hence, the sample size would be needed = 385

8 0
3 years ago
Which graph represents the function f (x) = StartFraction 4 Over x EndFraction?
beks73 [17]

Answer:

2nd graph (image)

Step-by-step explanation:

The function to graph is:

f(x)=\frac{4}{x}

It follows the general pattern of the function:  f(x)=\frac{1}{x}, which is general shape and in 1st and 3rd quadrants. So, we can eliminate 3rd and 4th choices (because of quadrants).

The answer is either 1st, or 2nd graph.

Now, we simply can check a point in both.

lets take x = 4, so the function would be:

f(4) = 4/4 = 1

Hence, point is:

(4,1)

The first graph doesn't go through this point. The second graph does.

hence, we can successfully choose the 2nd graph as our answer.

7 0
3 years ago
Read 2 more answers
What is the variance of 6, 5, 2, 5, 8?
Sladkaya [172]
7177x 727 8252(20929/
7 0
3 years ago
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Classify the following triangle. Check all that apply.60"30A. scaleneB. isoscelesC, equilateralD, rightE. obtuseF. acute
borishaifa [10]
That's a scalene right triangle.
8 0
3 years ago
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A person that weighs 150 pounds on earth would weigh 50 pounds on mars. how much would a person that weighs 60 pounds on earth w
Schach [20]
150 lbs on Earth is equal to 50 pounds on Mars

60 lbs on Earth is equal to _____

Set up a proportion.

\frac{150}{50}  =   \frac{60}{?}
Cross multiply.

50 \times 60 = 3000
3000 \div 150 = 20
The person would weigh 20 lbs on Mars.
3 0
3 years ago
Read 2 more answers
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