In 2020, the United States population is 3.31 x 108. What is this number in standard form? А
33,100,000
B
331,000,000,000
С
331,000,000
D
3,310,000
anybody know the answer??

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?