2x+19 = x+23
x=4
So the answer is C
It's 1,000,000:
<span>the sum is 1 + 3 + 5 + ... 1999999 </span>
<span>= 1 + 2 + ... + 2000000 - 2*(1 + ... + 1000000) </span>
<span>= 2000000*2000001/2 - 2*(1000000*1000001 / 2) </span>
<span>= 1000000*(2000001 - 1000001) = 1000000000000 (one million million) </span>
<span>and dividing this by one million to get the average, </span>
<span>you get one million</span>
Please be specific about your question (write full information so that i can understand what is all about)