Answer:
Option B
Step-by-step explanation:
By the midsegment theorem,
"Midsegment of a trapezoid is half the sum of the parallel bases"
By this theorem,
y + 6 =
2(y + 6) = (3y + y) +(-7 + 3)
2y + 12 = 4y - 4
2y - 4y = -12 - 4
-2y = -16
2y = 16
y = 8
Therefore, length of the midsegment = y + 6
= 8 + 6
= 14
Option B will be the answer.
N+7 because n is the sum of 7 and n so you need to add them but you don't know what n is so you say n+7
Answer:
Mean of boiling times = 26.9 seconds
Step-by-step explanation:
Times ella recorded are given as;
24.5 seconds, 23.2 seconds, 29.8 seconds, and 30.1 seconds.
Now, we want to find the mean of these boiling times.
Formula for mean is;
Mean = sum of terms/number of terms
In this question,
number of terms = 4
Sum of terms = 24.5 + 23.2 + 29.8 + 30.1 = 107.6
Thus,
Mean = 107.6/4
Mean = 26.9 seconds