Solve using perfect square factoring patterns. y2 + 18y + 81 = 0 a. {–9} b. {9} c.{0, –1} d.{9, –9} ! will mark brainleist

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?