Can you help me solve a problem using these half-life formulas: n = t/T, R = 2ⁿ, Fd = (R−1)/R, Fr = 1/R, Nd = N1 − N2, R = N1/N2?

You've provided several formulas related to half-life calculations. To solve a problem, please provide the specific question or values you'd like to use with these formulas.

Here are the formulas you've shared and their meanings:

• $n = \frac{t}{T}$ This formula calculates the number of half-lives ($n$) that have passed, where $t$ is the total time elapsed and $T$ is the half-life period of the substance.

• $R = 2^n$ This formula determines the ratio ($R$) of the initial amount of a substance to the amount remaining after $n$ half-lives.

• $F_d = \frac{R-1}{R}$ This formula calculates the fraction of the substance that has decayed ($F_d$).

• $F_r = \frac{1}{R}$ This formula calculates the fraction of the substance that remains ($F_r$).

• $N_d = N_1 - N_2$ This formula calculates the amount of substance that has decayed ($N_d$), where $N_1$ is the initial amount and $N_2$ is the remaining amount.

• $R = \frac{N_1}{N_2}$ This formula defines the ratio ($R$) as the initial amount ($N_1$) divided by the remaining amount ($N_2$).

Please send me the problem you need help with!