Out of 60 rolls, i roll 15 1's, then the second time i roll 8 1s. say that i wanted to analyze how likely it is that i rolled the proportion of 1s that i did. would it be appropriate to use a normal model to figure something like this out? and why?

Bismuth-210 is an isotope that radioactively decays by about 13% each day, meaning 13% of the remaining bismuth-210 transforms into another atom (polonium-210 in this case) each day. if you begin with 233 mg of bismuth-210, how much remains after 8 days?

What is the value of x? enter your answer in the box. photo attached.

Look at this pattern ; 1,4,9, number 10000 belongs in this pattern . what’s the place of this number?