Task 1
The sum Sn of a finite arithmetic series of n terms is Sn
the nth term.
(a1 + an) where ai is the first term and an is
2
nin1
a. Show that Sn = nai + d by replacing an with its value in terms of ai, n, and d in the above
formula
b. Explain why Sn = nai +
n (11-1)
d makes sense by explaining how you can extract each of na and
(n-1)
2 -d from the sum a1 + (a1 + d) + (a1 + 2d) + ... + (a1 + (n − 1)d).
2

step-by-step explanation: h: (- 3, 6)

m: (1, - 2)

o: (7, 6)

r: (- 9, - 2)

midpoint of hm: (- 1, 2)

midpoint of or: (- 1, 2)

therefore, b is the midpoint of both diagonals bisect each other !

to prove the diagonals are perpendicular, show that the product of the slopes = - 1

step-by-step explanation:

divide, then simplify your answer.

1. make -15.66 ÷   5.8 a fraction. then divide.

2. simplify.  

3. final answer.  

answer: do we write it

step-by-step explanation:

well we know there are 4 clubs in 52 cards so it’s replaced so it should be 3/51

step-by-step explanation: