Need help!! A certain radioactive substance decays exponentially over time. The amount of a
sample of the substance that remains, P, after t years is given by P(t) = 10e^-47,
where P is expressed as a percentage.
a. At what time has 50% of the substance decayed? (5 marks)
b. Determine the rate of change of the function. (2 marks)
c. What is the rate of decay when 50% of the original sample has decayed? (2 marks)

show calculation pls. can you answer any of the question?

(n^3 - n)

= n(n-1)(n+1)

since it is divisible by 3 and 2 ,because it is a multiple 3 consecutive number

if, n-1 is odd then n+1 is also odd, then it is a multiple of 9

but if, n-1 is even then n+1 is also even, then it is a multiple of 4

so, largest multiple = max(9*2, 4*3) = max(18, 12) = 18

mx+89b(-98)nb

step-by-step explanation:

answer: 819.89 miles across america

step-by-step explanation:

you didn't post any answer choices, so its not 100% clear what your teacher is looking for

however, log(15/7) is equivalent to log(15) - log(7)

i'm using the rule log(x/y) = log(x) - log(y)