Lance says that 2,376÷10 to the power of two is the same as 2,376×0.1 is he correct? why or why not?

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?

Tan198=asin164=? how to solve this? ?

Can someone tell me if these are correct?