The cost of renting a table at a flea market is based on a fixed price per day plus an initial registration fee. If it costs $45 to rent a table for one day and a total of $90 to rent a table for four days, which of the following equations represents the total
cost (c) to rent a table at the flea market for d days?

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?