Suppose (12, 8) and (4, 6) are the endpoints of a diameter of a circle. Which is an equation of the circle?
A) (x + 8)2 + (y − 7)2 = 17
B) (x − 8)2 + (y − 7)2 = 17
C) (x + 8)2 − (y + 7)2 = 17
D) (x − 8)2 + (y − 7)2 = 289

Ascientist has 50 grams of a radioactive element. the amount of radioactive element remaining after t days can be determined using the equation (1) after two days the scientist receives a second shipment of 50 grams of the same element. the equation used to represent the amount of shipment 2 remaining after t days is 10) - 50 which of the following is an equivalent form of the expression for the amount remaining in shipment 2? what’s the answer?