An atom of carbon-14 is unstable, meaning that it can spontaneously transform itself (by radioactive decay) into nitrogen at any instant. The probability that this will actually happen to a specific atom of carbon-14 in the course of a year is only 0.0121 percent, however. In other words, there is a 99.9879 percent chance that any specific atom of carbon-14 will survive another year. Suppose that one million carbon-14 atoms are placed in a container. How many of these atoms are expected to be carbon-14 atoms one year later? The half-life question: How much time will it take for half the atoms to decay?

answer: 1, 3 and 5 are correct

step-by-step explanation:

5   1/4   miles per hour

step-by-step explanation:

15   3/4 / 3 = 5   1/4

3

step-by-step explanation:

in standard form:

a= dictionaries

b= maps

you have to buy 3 dictionaries, so put a 3 next to the a (dictionaries) so that you can multiply them by each other.

a3+b= 60 (the amount of money you have)

we already know the cost of a=15 so replace a with $15

($15 x 3)+b=60

multiply 15 and 3 to get $45 and replace it with $45

45+b=60

and then replace b with 15 to get the total:

45+15=60

that means you have $15 left after buying 3 dictionaries.

15 divided by the cost of a map ($5) equals 3.

so you can buy 3 maps.

sorry if it was confusing!