In a lab experiment, the decay of a radioactive isotope is being observed. At the
beginning of the first day of the experiment the mass of the substance was 1500
grams and mass was decreasing by 8% per day. Determine the mass of the radioactive
sample at the beginning of the 20th day of the experiment. Round to the nearest
tenth (if necessary).

307.7 grams

Step-by-step explanation:

The exponential decay equation with initial value 'A' and rate of decay 'r' ( in decimal) in 't' years is given by :-

As per given , we have

Initial mass of isotope = 1500 grams

Rate of decay : r= 8% =0.08

To find : the mass of the radioactive  sample at the beginning of the 20th day of the experiment ( i.e. after 19 days).

That would be ,

 [Using (i)]

 [Rounded to the nearest tenth]

Hence, the mass of the radioactive  sample at the beginning of the 20th day of the experiment = 307.7 grams

function 2 has a greater rate of change than function 1

function 2 has a greater y-intercept than function 1

step-by-step explanation:

percentage - 25%

probability - 0.25

we know,

total amount of students in class = 20

total boys = 10

total girls = 10

no of girls who wear glasses = 10/2 = 5

probability of choosing a girl with glasses is =

number of girls wearing glasses/total number of students in the class = 5/20

thus, percentage of selecting a girl wearing glasses will be

= 5/20 × 100

= 5 × 5

25%

therefore,

probability will be 0.25

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