This is the second part question to my first one posted about radioactive substance! PLEASE HELP!!

2. What aspect of the decay of the substance does each of the formulas highlight?

What is the y-intercept of the graph of the equation y=3(2^x)

Sanderson is having trouble with his assignment. his shown work is as follows: − 3 7 7 3 = − 3 7 × 7 3 = − 21 21 = −1 however, his answer does not match the answer that his teacher gives him. complete the description of sanderson's mistake. find the correct answer.

Urgent? will give brainliest to the first correct answer what is the area of the figure?