Math 130

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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 -

    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 -

    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 -

    Find the smallest values for a and b so that 21 base a equals 25 base b.

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