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Neporo4naja [7]
3 years ago
5

A positive number is called $n$-primable if it is divisible by $n$ and each of its digits is a one-digit prime number. How many

3-primable positive integers are there that are less than 1000
Mathematics
1 answer:
boyakko [2]3 years ago
4 0
Single digit primes are 2, 3, 5 and 7. Only 3 is 3-primable
Two digit numbers that are 3-primable are
27, 33, 57, 72, 75
The 3 digit numbers that are 3-primable are
222, 333, 555, 777
225, 252, 522
237, 273, 327, 372, 723, 732
255, 525, 552
357, 375, 537, 573, 735, 753

There are 28 3-primable natural numbers less than 1000
You might be interested in
Help me with this immediately​
BARSIC [14]

Answer:

complementary angles, x=19

Step-by-step explanation:

since the two parts of the angle add up to 90, they are complementary angles.

you can find x by adding them and setting it equal to 90:

3x-2+2x-3 = 90

5x-5 = 90

5x = 95

x = 19

5 0
4 years ago
In how many ways can the first 4 guests arrive at a party if 15 guests have been invited.
notsponge [240]

Answer:

The first 4 guests can arrive in 32,760 ways.

Step-by-step explanation:

The order in which the guests arrive is important. For example, A,B,C,D is a different outcome to B,A,C,D. So we use the permutations formula to solve this question.

Permutations formula:

The number of possible permutations of x elements from a set of n elements is given by the following formula:

P_{(n,x)} = \frac{n!}{(n-x)!}

In this question:

4 guests from a set of 15. So

P_{(15,4)} = \frac{15!}{(15-4)!} = 32760

The first 4 guests can arrive in 32,760 ways.

6 0
4 years ago
Read 2 more answers
the deer population in an an area decreased by 28 each year for 6 years. find the total change in population.
Elan Coil [88]

Answer:

168 is the change in population

Step-by-step explanation:

well if u think about it all u really have to do is take 28×6 and it would help u find the change in population

4 0
3 years ago
Read 2 more answers
write an expression for the perimeter of the triangle shown below a: 4.1x+29 b: 4.1x-29 c. 4.5x+29 d. 4.5x-29
drek231 [11]

Answer: a: 4.1x + 29.

Step-by-step explanation:

Since the perimeter is the length of all 3 sides added up, we do:

2.3x + 14 + -0.2x + 15 + 2x = 4.1x + 29

5 0
4 years ago
A manufacturer buys large quantities of certain fuel pumps. He finds that his cost depends on the number of cases, q, bought at
ruslelena [56]

Answer:

The correct option is <u>c) $17.50/case</u>.

Step-by-step explanation:

Note: The data in the question are merged. The data are therefore sorted and the whole question is represented before answering the question. Please, see the attached pdf file for the sorted data and the represented question.

The explanation of the answer is now given as follows:

Marginal cost refers to the cost incurred in order to produce one more unit of a product.

Therefore, marginal cost is the change in the total cost that is caused by a one-unit increase in the quantity of a commodity that is produced.

From the table in the question, the marginal cost at q = 108 can be calculated as follows:

Change in total quantity at 180 cases = 108 - Number of cases immediately before 108 = 180 - 104 = 4

Change in total cost at 180 cases = Total cost at 108 cases - Total cost immediately before 108 cases = 1990 - 1920 = 70

Marginal cost at 108 cases = Change in total cost at 180 cases / Change in total quantity at 180 cases = 70 / 4 = 17.50 per case

Therefore, the correct option is <u>c) $17.50/case</u>.

Download pdf
4 0
3 years ago
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