Iodine-125 has a half-life of about 60 days. How many milligrams of a 500 mg sample will remain after 300 days? 0.6 mg 7.8125 mg 15.625 mg 31.25 mg

Which expression is equivalent to the expression shown?

The brain volumes (cm cubed) of 50 brains vary from a low of 904 cm cubed to a high of 1488 cm cubed. use the range rule of thumb to estimate the standard deviation s and compare the result to the exact standard deviation of 175.5 cm cubed, assuming the estimate is accurate if it is within 15 cm cubed

What is the answer to this question? i'm a bit stumped. also how do i do it? 5(x - 4) = 2(x + 5)