There was a sample of 200 mg of radioactive substance to start a study. since then, the sample has decayed by 4.4% each year. let t be the number of years since the start of the study. let y be the mass of the sample in mg's. write and exponential function showing the relationship between y and t

mx+89b(-98)nb

step-by-step explanation:

answer: r there any options?

step-by-step explanation:

n=9

step-by-step explanation:

7 times a number = 7n

decreased by 13 = 7n-13

same as is =

5 times the number = 5n

increased by 5 = 5n+5

7n-13 = 5n+5

2n=18

n=9

step-by-step explanation:

i'm pretty sure it would take 20 hours because it's half the men so you multiply the number of hours it takes by 2