Marco purchased 2 boxes of cereal, 2 boxes of granola bars, and 3 packages of crackers. Each item cost c dollars. Marco wrote an expression for the cost of the cereal. Then he wrote expressions for the cost of the granola bars and the cost of the crackers. He used all of these to write an expression for the total cost. Which expression did Marco write to represent the total cost?

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?