Answer:
125
Step-by-step explanation:
All the work is in picture attat
Answer:
23
Step-by-step explanation:
6x+12=5x+35
x=23
Why not look up "standard deviation" yourself, to be sure? But yes, the std. dev. is the sqrt of the variance.
Answer:
Solving the inequality we get x>-9.33
The graph is shown in figure attached.
Step-by-step explanation:
We need to solve the inequality: 
Solving:

Switching the sides , reversing the inequality and Multiply 3 with terms inside the bracket

Subtract 6 from both sides

Divide both sides by -3 and inequality will be reversed

Solving the inequality we get x>-9.33
The graph is shown in figure attached.