After substituting, what is the first step when evaluating 4y+9/7 when y=8 add 4 and 9. multiply 8 by 4. divide 9 by 7. divide 4 by 7

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?