The accompanying graph illustrates the decay of $_{42}^{88} \mathrm{Mo}$ which decays via positron emission. (a) What is the half-life of the decay? (b) What is the rate constant for the decay?(c) What fraction of the original sample of $_{42}^{88} \mathrm{Mo}$ remains after 12 $\mathrm{min}$ ? (d) What is the product of the decay process? [Section 21.4$]$