Answer:
Step-by-step explanation:
you just have to evaluate the expression and then solve it
Answer:
A variable is a quantity that may change within the context of a mathematical problem or experiment.
Step-by-step explanation:
Answer:
29.7 is the standard deviation :)
Answer:8.5...
Step-by-step explanation:

put all numbers on the left

third equation is the answer

multiply by 3
3x-y=0