Another question I need help with

Look at this pattern ; 1,4,9, number 10000 belongs in this pattern . what’s the place of this number?

Find the distance between (0,5) & (-4,2)

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?