9/10 ÷ 5/10
can you please explain?

Find the total area for the regular pyramid ( follow the answer set up in the picture)

Use sigma notation to represent the following series for 9 terms.

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?