Answer: 
Step-by-step explanation:
For a lineal equation 
For r=0 and t=-1

For r=-2 and t=0

Them 
???? The output for 6 is 1????
Answer:
About 250 attendance
Step-by-step explanation:
Answer:
he earned 14 dollars
Step-by-step explanation:
if you are looking for how much did he earn you take the number that they started with and subtract it from what they have after so the equation is $21-$7 and thats how much he eaened
Let's begin by listing out the information given to us: