The radioactive isotope sodium-24 is used as a tracer to measure the rate of flow in the blood vessels. The half-life of sodium-24 is 14.9 hours, suppose that a hospital buys a 498
sample of sodium-24.
a) How much of the sample will remain after 48 hours?
b) How long will it be until only one gram remains?

the figures below are made out of circles, semicircles, quarter … find the area and the perimeter of each figure and give your answers as a completely simplified exact value in terms of π (no approximations). remember that we'll also have to cut whatever areas we get in half, since we're only dealing im pretty sure that is the right answer

step-by-step explanation:

the number of possible outcomes that do not show a 1 on the first spinner and show the number 4 on the second spinner is 2.

spinner 1 spinner 2

1                     1

1                     2

1                     3

1                     4

2                   1

2                   2

2                   3

2                   4   = not 1, and 4

3                   1

3                   2

3                   3

3                   4 = not 1, and 4

only 2 outcomes have passed the given condition.

step-by-step explanation:

and?

step-by-step explanation: