Answer:
z = 18
Step-by-step explanation:
z/3 = 6
Multiply by 3 on both sides
z/3 * 3 = 6*3
z = 18
to find slope use 
which means the answer is -1
At the end of 3 years, your savings will have grown to $483.
You will have earned in $83.17 in interest.
Answer:
4 + (3s/10) gallons
Step-by-step explanation:
Originally, there are 4 gallons. Add that to the expression. Every second, 3/10 gallon are filled. So s times 3/10 equal the total number of gallons added. Add both expressions together to get the answer.