Remember you can do anything to an equaiton as long as you do it to both sides
-x=4-3x
add 3x both sides
3x-x=4+3x-3x
2x=4+0
2x=4
divide 2
2x/2=4/2
2/2x=2
1x=2
x=2
Answer: 12.10
Step-by-step explanation:
Given : Mean : 
Standard deviation : 
The formula to calculate the z-score :-

For x= 5 degrees

For x= 10 degrees

The P-value : 

In percent , 
Hence, the percentage of days had a low temperature between 5 degrees and 10 degrees = 12.10%
Answer:
34.5 units²
Step-by-step explanation:
7 x 3 = 21
4.5 x 3 = 13.5
21 = 13.5 = 34.5 units²
Answer:
B
Step-by-step explanation:
2x = 6+14
2x = 20
x = 10