Answer:
THC
Step-by-step explanation:
Answer:
7/12
Step-by-step explanation:
Find the common denominator 24 so fraction would change to 6/24 + 8/24
that equals 14/24 and simplified that 7/12
Answer:
AB=11, DC=11, AD=25, BC=25
Step-by-step explanation:
Opposite sides of parallelograms are congruent.
x+x+2x+3+2x+3=72
6x+6=72
6x=66
x=11
2(11)+3 = 25
Answer:
yes
Step-by-step explanation:
no
Answer:
-499,485.
Step-by-step explanation:
We can transform this to an arithmetic series by working it out in pairs:
6^2 - 7^2 = (6-7)(6+7) = -13
8^2 - 9^2 = (8-9)*8+9) = -17
10^2 - 11^2 = -1 * 21 = -21 and so on
The common difference is -4.
The number of terms in this series is (998 - 6) / 2 + 1
= 992/2 + 1 = 497.
Sum of n terms of an A.S:
= n/2 [2a1 + (n - 1)d
Here a1 = -13, n = 497, d = -4:
Sum = (497/2)[-26 - 4(497-1)]
= 497/2 * -2010
= -499,485.
