Which subtraction expression
has the difference 1 + 4/?
o (-2+61) – (1 – 21)
(-2 + 61) – (-1 – 21)
(3 + 51) – (2 - 1)
(3+51) - (2 + 1)

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?