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 four-digit 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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