First of all, this is not an observational study, but an experiment, since we have two groups and one of the two groups is manipulated or treated. In an observational study the subjects are only observed.
Second, the students did not choose their groups - so we can't choose the last answer.
Therefore the correct answer is:
This is an experiment because a treatment was applied to a group.
Step-by-step explanation:
the slope is -3
that is the answer
The water draining would be continuous because it is not squirting out in amounts it’s flowing out
28 - 6n + 7.(5n - 2) - 2n
28 - 6n + 35n - 14 - 2n
28 - 14 + 35n - 6n - 2n
14 + 28n
14.(2n + 1)
The constant in an algebraic expression is the only term that cannot be changed.
Terms with variables are not constants as their values can changed as the variables change.
Our equation is 3m+7
M is a variable. Therefore the term '3m' is not the constant.
This leaves us with the term '7'. There is no variable present in this term.
'7' is the constant in this equation.