The initial amount of a substance is 132 grams. The amount of the substance decreases by 50% every 9 years. Choose the correct equation for the amount of the substance remaining after t number of years. OA. P=132+50t OB. P=132(0.5)⁹t OC. P=132(0.5)⁹t ○ D. ○ E. P=132(0.5)⁹ t P=132(0.5)⁹ How many grams are left after 5 years? (round to the nearest hundredth) ☐ grams What is the yearly decay factor? (round to the nearest ten-thousandth) What is the yearly decay rate? (round to the nearest hundredth of a percent) ☐ %