Answer ! the half life of a certain substance is about 4 hours. the graphs shows the decay of a 50 gram sample of the substance that is measured every hour for 9 hours .which function can be used to determine the approximate number of grams of the sample remaining after t hours

answer: .64

step-by-step explanation

set up the formula for standard deviation for this set of numbers, then simplify

step-by-step explanation:

because 1/3 is a fraction. we can tell because there is a divisor symbol between the 1 and the 3. if we were to add 2 fractions together, we would add the numerators, which is the number on top, but not the denominators, which is the number on the bottom

1/3+1/3=2/3

hope this !