Answer:
169/4
Step-by-step explanation:
Take the coefficient of the x term. Here it's -13. Now halve that, obtaining -13/2. Finally, square this result. We get 169/4. This is the desired number.
x^2 - 13x + 169/4 - 169/4 + 14 = 0
Answer:
145/2
Step-by-step explanation:
d=[2x+1-x] = [5x+1 -(2x+1)]
x+1=3x
x-3x=-1
-2x=-1
x=1/2
therefore first term is 1/2
second term is 2(1/2)+1= 2
common difference d is 2-1/2=3/2
sum of first n terms is n/2 [2a+(n-1)d] where n=10
sum of first 10 terms= 10/2[2×1/2+(10-1)3/2]
=5[1+(9)3/2] =5[1+27/2] = 5[29/2] =145/2
Anything without a variable in front.
In other words, the constants are -3.7 and 1/3
Answer:
B
Step-by-step explanation:
bbbbbb brainless me
Find the total points for each group:
31 students averaged 82, so the total points were 31 x 82 = 2542
2 students averaged 88, so the total points were 2 x 88 = 176
Now add the total points and divide by 33 students (31 +2):
2542 + 176 = 2718
2718 / 33 = 82.36
The average is 82.36 ( Round as needed).
