If P=(3,1) and Q=(-3,-7), find the equation of the circle that has
segment PQ as a diameter.
(x – 0)2+(y - [ ? ])2= []
Please help ASAP!

How do you solve a question like this?

Janie has $3. she earns $1.20 for each chore she does and can do fractions of chores. she wants to earn enough money to buy a cd for $13.50. write an inequality to determine the number of chores, c, janie could do to have enough money to buy the cd.

Asurvey of 2,000 doctors showed that an average of 3 out of 5 doctors use brand x aspirin.how many doctors use brand x aspirin