Name a degenerative joint disease in which the body’s immune system mistakenly attacks its own tissue in the joint or organs.

Rheumatoid Arthritis

Explanation:

In patients suffering from rheumatoid arthritis, accumulation of urates occur in the joints due to the deficiency of a vital enzyme, as a result the immune system produces antibodies that attack these joints or organs where urates are found.

This eventually leads to inflammation & degeneration of the joints, characterized by painful swelling and stiffness

p=20d+0.80

Step-by-step explanation: This is the answer because it costed him 20 dollars per day so it is 20 and d represents the day.  And the 0.80 is the cost of ingredients. when you put them together you can get the answer in terms of p