Which number should come next? 144 ,121, 100, 81, 64 __?

49

For a polynomial of order less than 5 49 is the only fit. For an order 5 polynomial fit, ANY of the alternatives given could fit. In fact a 5th order polynomial fit can be found for 144,121,100,81,64,u where u is any value you care to choose. Consider this. A 5th order polynomial is of the form ax^5 + bx^4 + cx^3 + dx^2 + ex + f. 6 unknowns. a unique solution is a certainty for ANY value of u.

i love 49 ... yeaaa.. lookin me :)

The next number should in the square root of 7. That is (d)49.

Here I also have one question for you: 1,4,9,16,25,36,49.......what is the sum of the 100 terms of this number pattern?

solve this : 2x + 6 = 30, find the value of x.

well my answer is d.49 because the next difference should be 15

Well The numbers are detecting By last-2. Or The Square Of the previous Number. So the next One Will be 49!!!

I choose d 49.144-121=23,121-100=21,100-81=19,81-64=17. So look 23,21,19,17~~haha~~the next is 15. 64-15=49.

Well, as it is solved already What is the next problem? But let me give you one puzzle. Can you prove from 1=1 to 1=2

Answer is 49. Because it is a series of perfect squares in decresing order starting from 12, 11, 10, 9, 8 and after this it should be square of 7. Which is 49. hence answer is 49.

It shoud be defintely 49 you took it this way: 144-121=23 121-100=21 100-81=19 81-64=17 and then the last number 64-(__)=15 that is 64-49=15 49 should be the perfect match for this problem continuing the series of odd numbers from 23-15

Well lets look into this: 144-121=23 121-100=21 100-81=19 81-64=17 64-?=15 Definitely 49 There's an other simpler way 12^2=144 11^2=121 10^2=100 9^2=81 8^2=64 7^2=? This way also its 49.

D.49 Because: 144=12times12 121=11times11 ...... 64=8times8 ?=7times7 Right??

it should be 49,36,25,16,9,4,1.they are in the form of squares but in the descending order of numbers.

The correct answer is 49, and that's from the choices letter "d". Well it is an arithmetic progression with numbers having differences of also arithmetic progressing odd numbers starting 23, 21, 19, 17, and 15. Well, you have made a unique discussion. I believe you are fond of mathematics. For me, its been a routine exercises when I studied Civil Engineering in my college years. Now that I am a Professional Civil Engineer already, its a great recall of those tricky math problems you have just posted. You are definitely unique. Hear you around my friend.

is this a number sequences? my answer is 49 because 144 is perfect square of 12, 121 is perfect square of 11, 100 is perfect square of 10, 81 is perfect square of 9, 64 is perfect square of 64, so perfect square of 7 is 49. correct!!!!!

49 dear as u will subtract 15 from 64

The answer is 49.

49