Posted by Enis on Wednesday, February 27, 2013 at 1:52pm.
Sum the first two odd numbers, then the first three, the first four, and so on. From these observations could you guess the sum of the first 100 odd numbers?

Math 130  bobpursley, Wednesday, February 27, 2013 at 2:28pm
1+3=4
1+3+5=9
1+3+5+7=16
notice it goes like this:
first two = 2^2
first three=3^3
first four= 4^2
first 15=15^2
first hundred= ???

Math 130  Enis, Wednesday, March 6, 2013 at 3:53pm
How many fourdigit numbers abcd exist such that a is even, b is divisible by 5, c is prime, and d is odd?

Math 130/ help please  ENIS, Friday, March 15, 2013 at 7:42pm
Find the smallest values for a and b so that 21 base a equals 25 base b.
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