21. How many odd integers are between nine and 46? //Is there any trick to these? or do you just count?
there's a trick for it. if it says between two numbers, you do the larger number- smaller number, subtract the difference by how many odd/even (depending on the problem) are in the ending numbers, then divide by 2. ok, i know it's not very clear, so let me do an example
21. How many odd integers are between nine and 46?
larger number 46- smaller number 9= 37, 37 - 1 (only 9 is an odd number, 46 is not, so you subtract only 1)= 36, 36/2 = 18
ex 2 How many odd integers are between nine and 47?
47-9-2(because both 9 and 47 are odd)=36/2=18
70* 4.1^3 * 5.1^3
4^3*5^3, then round up some
72. The sum of the first nine terms of 1 + 3 + 4 + 7 + ... is?
ah...i am in a class and it's about over...gtg, i'll answer it later
The sum of the first nine terms of 1 + 3 + 4 + 7 + ... is?
555/27, is there any trick to it or do you just work it out?
i think those 2 problems are new this year...and thus can't be talked about on the forum...if not, go ahead pm and i'll write the trick down. but i can tell you that the sum of the 1st 10 terms in a fib. sequence is the 7th term x 11