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yanalaym [24]
3 years ago
11

What is the sum of the series 18 E n=4 (n+1) ^2? 1,239 2,415 2,440 2,469

Mathematics
2 answers:
Akimi4 [234]3 years ago
8 0

Answer:

<h2>C. <em><u>2</u></em><em><u>4</u></em><em><u>4</u></em><em><u>0</u></em></h2>

Step-by-step explanation:

hope it helps u too

Leto [7]3 years ago
5 0

9514 1404 393

Answer:

  (c)  2440

Step-by-step explanation:

The sum of the squares of numbers 1 .. n is ...

  s(n) = n(n +1)(2n +1)/6

You want the sum of squares from 5 to 19. We can compute that from ...

  s(19) -s(4) = (19(20)(39) -4(5)(9))/6 = (14820 -180)/6 = 2440

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Express each fraction as a percent. Round your answer to the nearest whole number.
GREYUIT [131]

Answer:

60.8% which rounds to 61%

42.61% which rounds to 43%

29.14% which rounds to 29%

Step-by-step explanation:

So, there are two ways to do this, either perform the division as you see it, or make it so it is  some number over 100 instead of what it is.


For the first one if you just do the division, either with long division or with a calculator you get exactly .608.  The other two are not as nice, jsut a warning.  From here you multiply it by 100 to get the percent.  For instance with .5 (which is half) the corresponding percent is 50%, which is after you multiply .5 by 100).  if you need help with the division let me know and I can work you through one.


if we go with the second way we would want to make 125 into 100.  To do this we need to multiply it by something to get to 100.  Or in other words, 125x=100.  This winds up being .8, or 8/10  You could also see it as dividing 125 by 1.25 or 5/4, if you need help with this (or any part in particular really) let me know.  


Anyway, since one part of the fraction is being multiplied or divided, the other part does too, so you would take 76 and do the same.  Whichever number you use you get 60.8.  You don't have to  multiply this by 100 since it is already part of a fraction over 100.


Again, let me know if you need more help, I will leave the other two to you unless you need the help.

8 0
2 years ago
my dad just sent me this riddle, i’ve spent an hour on this and even brought my mom into it but no one can figure it out, help?
jasenka [17]

Answer:

What grade are you?

Step-by-step explanation:

Cause it's hard even gòogle can't answer it.

7 0
2 years ago
Read 2 more answers
find the number of positive integers not exceeding 100 that are either odd or the square of an integer.
Ivenika [448]

Answer:

55

Step-by-step explanation:

50 odd numbers and 3 even square numbers

3 0
1 year ago
thomas argues that rational 27 divided by rational 3 is rational. mateo argues that the quotient between rational 27 and rationa
vitfil [10]

Answer:

Rational

Step-by-step explanation:

A number that cannot be expressed that way is irrational. For example, one third in decimal form is 0.33333333333333 (the threes go on forever). However, one third can be express as 1 divided by 3, and since 1 and 3 are both integers, one third is a rational number.

8 0
3 years ago
What’s the answer and work for this?
sergeinik [125]

to find the value of x, you have to subtract 95 from 180. so the value of x will be 85. to find the value of y, you have to add the value of x which is 85 to the given angle which is 50. the angle would be 135. since the triangle is 180 degree, now u subtract 135 from 180. and the value of y will be 45. so x is 85 degree and y is 45 degree. hope that helps.

8 0
3 years ago
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