The class treasury contained 30$ in nickels and dimes. If there were 500 coins than how many coins of each type are there?
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Here , first we need to find the area of the pizza. And for that we use the formula of area of circle which is pi *r*r .
Now we have diameter =18 inches , so radius = 9 inches. Therefore area is
pi*9*9 =81 pi .
And this area is divided in 10 slices. SO area of each slice is
Ok so
for a thing that is P amount at first, with a half life of k days
after t days, the amount left is A
the equation is
given
13% of P remained=A
t=400
replace A with 0.13P and t with 400
0.13P=
divide both sides by P
take the ln of both sides
multiply both sides by k
divide oth sides by ln0.13
k=
evaluate
k=135.897 days
the half life is 135.897 days
for a thing that is P amount at first, with a half life of k days
after t days, the amount left is A
the equation is
given
13% of P remained=A
t=400
replace A with 0.13P and t with 400
0.13P=
divide both sides by P
take the ln of both sides
multiply both sides by k
divide oth sides by ln0.13
k=
evaluate
k=135.897 days
the half life is 135.897 days