Which relationship in the triangle must be true?
sin(B) = sin(A)
sin(B) = cos(90 – B)
cos(B) = sin(180 - B)
cos(B) = cos(A)

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?