Bricks are stacked according to the pattern shown below. Each row contains one more brick than the row above it.
I
Part A
Determine a quadratic function to model the total number of bricks in the stack,
f(x), given a number of rows, X.

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?