:part 1
lisbeth runs on the track team. after practicing for 4 weeks, she lowers her time in the 800 meter run by 20 seconds.
which expression can you use to calculate the average change in seconds per week?
a.-800÷4
b.-20÷4
c.20÷4
d.800÷4
part 2
evaluate the expression that represents the scenario.

there will be 35 boys in each team. : )

a function could be identified in 3 ways either on a chart,graph, or ordered pairs. first a function is that each point has its own. the rule is that there can be many x's to one y but there can not be 2 x's at different y's. so on a graph when you put a straight line through the y's there should be one dot only to be a function.

step-by-step explanation:

answer: -2+√x,-2-√x

i hope this , i don't know if you're looking for a pair or not.