Well, we could try adding up odd numbers, and look to see when we reach 400. But I'm hoping to find an easier way.
First of all ... I'm not sure this will help, but let's stop and notice it anyway ... An odd number of odd numbers (like 1, 3, 5) add up to an odd number, but an even number of odd numbers (like 1,3,5,7) add up to an even number. So if the sum is going to be exactly 400, then there will have to be an even number of items in the set.
Now, let's put down an even number of odd numbers to work with,and see what we can notice about them:
1, 3, 5, 7, 9, 11, 13, 15 .
Number of items in the set . . . 8 Sum of all the items in the set . . . 64
Hmmm. That's interesting. 64 happens to be the square of 8 . Do you think that might be all there is to it ?
Is the Square Root of 225 Rational or Irrational? 225 can be expressed as the ratio of two integers. As 225 can be expressed as 225 = 225/1. Thus 225 is rational.
First add 90 to both sides) -mk>85+90simplify 85+90 to 175) -mk>175divide both sides by K) -m>175/kmultiply both sides by -1) m<-175/k YOUR ANSWER IS M<-175/K hope l helped today l was stuck on the same question doing part 2 of alg exam , and l came through your question l hope it's not too late :)
