Jammy

Iodine-131 is often used in nuclear medicine to obtain images of the thyroid. If you start with 3.6 109 I-131 atoms, how many are left after approximately 1 month? I-131 has a half-life of 8.0 days. can you tell me how to do that problem and what answer y...

A farmer wants to fence in a rectangular pen using the wall of a barn for one side of the pen and 115 feet of fencing for the remaining 3 sides. What dimensions will give her the maximum area for the pen?

A student earns $10 per hour for tutoring and $7 per hour as a teacher's aide. To have enough free time for studies, he can work no more than 20 hours per week. The tutoring center requires that each tutor spends at least three hours per week tutoring, bu...

IS MY ANSWER CORRECT? If you would like to make $1213 in 8 years, how much would you have to deposit in an account that pays simple interest of 5%? I=1213(.05)(8) I=388.16 Interest Earned is $388.16 1213+388.16=1601.16

A poll was taken of 10,439 working adults aged 40-70 to determine their level of education. The participants were classified by sex and by level of education. The results are shown below. Education Level Male Female Total High School or Less 2023 3264 528...

so i converted 8 days to one month and got.266666... and i plugged that in for t 1/2 so when i divided those two numbers i got 2.59875 but that doesnt seem nearly correct at all what am i doing wrong?

oh sorry! I didn't compute that part. lol. ill try that now

i did those calculations and got 1385281385. so i put that for my answer and it said it was wrong. So, now i only have one more entry left.

yes that is wut i had. so you end up dividing 3.6e9 by 2.59875 and you get 1385281385 which is wut i originaly had. but its wrong.. wait.. i searched on google for the equation so i can see it layed out and this website im on says nt/no for the first part...

yes!! good job!!

oh man i totaly forgot the log!! oops! I tried that and it said it was wrong. that was my last submission. But its ok. i have 13 other questions so if i get those i will at least get an A-. but.. i just want to know for future reference why that is wrong....

answers: New York, P(x=N)= 56/500=.112 P(x=T)=43/500 = .086 P(x>=1)=P(x=N)+P(x=C)+P(x=T)+P(x=I)+P(x=O)P(x=P). =56/500+53/500...28/500=0.49