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Rainbow [258]
2 years ago
12

Using each digit once, list all the 3-digit numbers that can be made From 1, 4, and 7.

Mathematics
1 answer:
nataly862011 [7]2 years ago
4 0

Answer:

1,4,7 1,74. 4,7,1 ,4,1,7 ,7,4,1

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Guess the rule and add the next number in the sequence.<br> 1, 5, 13, 25, 41, ?
WINSTONCH [101]

Suspect: we start adding 4, later 8, 12, 16...

Therefore, the next number is 41 + 20 = 61.

Now, we try to guess the rule.

Note that, the numbers that we add are multiples of 4. Try to write the sequence in a different way like this:

1, 1 +4, (1+4) +8, ((1+4)+8)+12, (((1+4)+8)+12) +16, ...

1, 1+4, 1 + 4(1+2), 1 + 4(1+2+3), 1+ 4(1+2+3+4)...

You must to know that 1+2+3+...+ n = n(n+1)/2

Then, the nth numbers of the sequence must to be 1 + 4n(n+1)/2 = 1+2n(n+1) = a_n

Check the formula:

n = 0 then a_0 =  1+ 0

n=1 then a_1 = 1 +2(2) = 5

n=2 then a_2 = 1 +2(2)(3) = 13

n=3 then a_3 = 1 +2(3)(4) = 25

n=4 then a_4 = 1 +2(4)(5) = 41

n=5 then a_5 = 1 +2(5)(6) = 61

....

5 0
3 years ago
Stephanie spends $15 each month to belong to a photography club. As a member of the club she can develop rolls of film for $2.50
larisa [96]

Answer:

2.5*5= 12.5

15-12.5=2.5

So in order to pay the 15 dollars in the photography club, she only has to pay 2.50

6 0
3 years ago
Find the missing side?
weeeeeb [17]

Answer:

Hey there!

Pythagorean Theorem: a^2+b^2=c^2

16+25=c^2

41=c^2

c=6.4

Let me know if this helps :)

6 0
3 years ago
The volume of a cylinder, found using 3.14 to approximate pi, is 30,395.2 cm3. The radius of the cylinder is 11 cm.
ivanzaharov [21]
V=hpir^2
we can make it easir by solving for h already
divide both sides by pir^2
V/(hpir^2)=h

V=30395.2
pi=3.14
r=11
30395.2/(3.14*11^2)=h
30395.2/(3.14*121)=h
30395.2/379.94=h
80.002=h


about 80cm is height
4 0
4 years ago
If you simplify 4(3x + 8) - 3 . What will your answer be ?
scoundrel [369]
1.) Distribute 4 to (3x) & (8): 4*3x=12x, 4*8=32
2.) Rewrite the expression: 12x+32-3
3.) Combine like terms: 32-3=29
4.) Rewrite the final expression: 12x+29
Final Answer: <span>12x+29
Hope this helps!!
</span>
8 0
4 years ago
Read 2 more answers
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