91.5 is the perimeter. It's just 5a.
For 6 plug in each of the answers for x and see if the product =3.2
Answer for 6: A
For 7 you turn the percentage into a decimal and multiply that by the number in which you know and you find the answer.
Answer for 7: D
Answer:
x+((4 + 1/3))=(-(2 + 5/6))
6x = -43
x≈ -7.166667
Step-by-step explanation:
Mean of the origibal set = 20
No. of terms = 10
Sum = Mean x No. of terms
= 20 x 10 = 200
The sum of additional numbers to make the new set of observstion is 4 + 8 + 12...... + 40 = 220
New Sum = 200 + 220 = 420
The no of terms stay the same
New Mean = New Sum/ N
= 420/10
= 42
Given:
The ratio is 
.
To find:
Inverse tangent of the given ratio.
Solution:
We know that,
Inverse tangent of the ratio = 
= 
Using scientific or graphing calculator, we get
Inverse tangent of the ratio = 
Round to the nearest degree
Inverse tangent of the ratio 
Therefore, the correct option is C.
