7×65 7×(60+5)
(7×60) (7×5)
(420)+(35)
The answer is 455
It'd be easier to do #18 if y ou were to break it up:
14* (first term + 14th term)
Sum from n=1 to 14 of n = S = ---------------------------------
14 2
14(1+14)
= ---------------- = 7(15) = 105
2
The sum of twice that is 210. The sum of "1 from n=1 to n=14" is just 14.
The final sum is 210 + 14 = 224 (answer)
A,b,c, d that’s the answer
Answer:
you will have to have 2,184 games to have a winner
Step-by-step explanation:
