What is the circumference of the circle use 3.14

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?

Find the percent of change for all three questions plz 1) 35 birds to 45 birds 2) 60 inches to 38 inches 3)$2.75 to $1.80

Explain the pythagorean theorem in one paragraph with evidence supporting your claim.