Answer:
1.25kg
Step-by-step explanation:
useing the problem the half life equation will be:
f(x)=5(0.5)^(x/140)
x is amount of days
so plugging in 280 for x will get 1.25kg
Answer:
If there are 2 quarters for every 3 nickels,
then there are
quarters.
If there are 2 dimes for every quarter,
then there are
dimes.
If the number of pennies and nickels together are equal to the number of dimes, then there are
pennies.
the answer would be a or b. Turn on verified mode for professionals to answer)
Answer:

Step-by-step explanation:
The reciprocal of a number n is 
Given 8
, change to an improper fraction
=
=
, thus
reciprocal =
= 