Answer:
- 494
Step-by-step explanation:
Breaking down the summation into it;s component parts
= 4k -
k(k + 1) ← substitute k = 19
= (4 × 19 ) - 1.5 × (19 × 20)
= 76 - (1.5 × 380)
= 76 - 570
= 494
Answer: B 2
Step-by-step explanation:
If you look at the graph, you can see it goes up every hour by 2.
So therefore your answer will be 2.
Hope this helps!
Yes it’s a rectangle because the diagonals bisect each other, and they are equal in length.