Mike and steve have wallets with 5$ and 10$ bills. if together they have 20 bills, and in total 135$, how many 5$ and 10$ do they have" , you dont have to solve it , just put it in system of equation form !

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?