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Question

The traditional method for calculating a dog's age in dog years is to multiply its age in human years by 7. The chart below describes a different method some veterinarians use to estimate a dog's age based on its size.
Size: Small Medium Large Giant
Weight: 20lbs 21‒50 51‒90 over 90
Age 2 in Human Years
small: 23 dog years
medium: 24 dog years
large: 22 dog years
giant:20 dog years
Age Increase Each Year After 2 in HumanYears:
small: 4 dog years
medium: 5 dog years
large: 6 dog years
giant: 7 dog years
1. Choose a dog breed in each size category. You can use the dog breed charts
on the following page or do research to choose a different breed.
2. Complete a table to show the dog year equivalent for each breed from 2-5 human years.
3.Let x equal the age, in human years, for a dog that is 2 years old or older. For each of your chosen breeds, write an expression to model its age in dog years. [Hint: Use (x2) in each expression.]
4. Choose what you consider to be a really old, but realistic, age for people.
5.For each expression you write, plug in the value you chose in step 4—an old age fora human—for x. Set each expression equal to A.
6. Solve each equation, and explain what the solution means. Add the old-age
values to your table.
7. Use your solutions to develop a convincing argument for why the method
described in the chart is better than the traditional method.
8. You may wish to do research to find the average lifespan for each dog breed
and use those facts in your argument.
Use your table, equations, solutions, and arguments to create your debate presentation.

What I've got so far:
(see second chart for dog sizes. we're supposed to go off of this for choosing the breeds)
(20lbs)Small dog- maltese
(21-50lbs)Medium dog- border collie
(51-90lbs)Large dog- golden retreiver
(Over 90lbs)Giant dog-newfoundland

Could I have some help with the formulas? Thank you!

Answer 1

You've done step 1. Try step 2, which can be done manually (without formulas). Once you finish that, step 3 will seem easier because you may see some patterns in your table created in step 2, to help you figure out the formulas.

Answer 2

the parts i need help with are

3.Let x equal the age, in human years, for a dog that is 2 years old or older.For each of your chosen breeds, write an expression to model its age in dog years. [Hint: Use (x - 2) in each expression.]
4.Choose what you consider to be a really old, but realistic, age for people.
5.For each expression you write, plug in the value you chose in step 4 an old age for a human—for x. Set each expression equal to A.

and

Use your solutions to develop a convincing argument for why the method
described in the chart is better than the traditional method.

Answer 3

I got step 2 and i do recognize a pattern, but I'm having trouble coming up with the equations they want >_<