The amount of a radioactive substance decreases by 50% every 2.5 days. right now the
amount of substance is 600 grams. how many grams of the substance will remain 5 days
from now?
a 192
b. 150
c. 96
d.48

Option B

150 grams

Step-by-step explanation:

Quantity right now is 600 grams

After the first 2.5 days, the substance reduces by 50% that is 50*600 grams/100=300 grams

For the next 2.5 days, the amount of 300 g reduces by 50% that is 50*300 grams/100=150 grams

Adding the first 2.5 days+ next 2.5 days we obtain 5 days ie 2.5+2.5=5 days

Therefore, the amount of substance that remains after 5 days is 150 grams

Answer=150 grams

d. millimeters per hour.

step-by-step explanation:

we are given that,

carlo used a rain gauge to measure the amount of water his lawn is receiving from the sprinklers.

since, according to the options, we see that,

water cannot be measured by 'miles per hour', 'meters per second' and 'grams per seconds'.

we get that, the water can be measured by 'millimeters per hour'.

hence, the appropriate rate for describing the amount of water is 'millimeters per hour'.