Each answer choice below represents a relation by a set of ordered pairs. In which of the answer choices is the relation a function? Select all correct answers.

Select all that apply:
{(9,−4),(−2,11),(−4,6),(9,−3)}
{(2,1),(−3,12),(6,12),(−2,−4)}
{(9,11),(6,−3),(7,4),(8,4)}
{(5,3),(9,7),(−1,2),(6,3)}
{(4,9),(2,−5),(−3,−4),(2,4)}

Tim open up a new saving account with a $50 deposit and plant to deposit $20 per week into the same account.write an expression to represent the total amount in his savings account.

The area of a rectangle is 10 cm^2. one side of the rectangle is x cm. express the perimeter of the rectangle in terms of x and show that this rectangle cannot have a perimeter of 12 cm. the perimeter of the rectangle in terms of x is __ cm

The mean finish time was 185.52 with a standard deviation of 0.327 minute. the winning car driven by chris finished in 185.13. the previous year race had a mean finish time of 110.3 with a standard deviation of 0.106. the winning car that year driven by karen finished in 110.13 minutes. find their respective z-scores. chris - z-score karen “- z-score