Answer: The man has 10$.
Step-by-step explanation:
We start with the number 60. He sells the goat for 70 dollars, and makes a 10 dollar profit. Then, he buys it for 80$, leaving him with 0. But then he sells it for 90$, making another profit of 10$.
Margie can spend $40 per dog for food and medication and $20 per cat.
I can explain the working out if you need it
Answer:
3x + y = 20
Step-by-step explanation:
The equation of line passing through two points is determined by formula:

Here, (x₁ , y₁) = (4, 8)
and (x₂, y₂) = (6, 2)
Putting these value in above formula. We get,
⇒ 
⇒ ( y - 8) = -3 (x - 4)
⇒ y - 8 = -3x + 12
⇒ 3x + y = 20
which is required equation.
A quadratic because of the -

.
3.2% per year
Hoping that helps :)