Tevin goes to a fast food restaurant and orders some tacos and burritos. He sees on the nutrition menu that tacos are 240 calories and burritos are 500 calories. If he ordered 11 items and consumed a total of 4200 calories, how many tacos and how many burritos did Tevin order and eat? PLEASE HELP THANK

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?