c) \( \mathrm{T}=\quad \) marks A 200 g sample of radioactive polonium- 210 has a half-life of 138 days. This means that every 138 days, the amount of polonium left in a sample is half of the original amount. The mass of polonium, in grams, that remains after \( t \) days can be modelled by \( M(t)=200\left(\frac{1}{2}\right)^{\frac{s}{138}} \). a) Identify the mass that remains after 5 years. b) How long does it take for this 200 g sample to decay to 110 g ?

a) \( -\left(-2^{-2}\right) \cdot \frac{\left(-2^{3}\right) \cdot 2^{-3}}{(-2)^{-5}} \)

En la figura, los valores de \( \sin (\beta), \cos (\beta) \) y \( \tan (\beta) \) son:

2. Gross profit is found by subtracting the cost of goods from the ___ or net sales. A. selling price B. markup on cost C. overhead D. net profit

4. Para armar um circo, 50 homens levam 2 dias, trabalhando 9 horas por dia. Com a dispensa de 20 homens, em quantos dias o circo será armado, trabalhando-se 10 horas por dia? (A) 7 dias (B) 6 dias (C) 5 dias (D) 4 dias (E) 3 dias

Answer the following questions for the price-demand equation. \[ p+0.001 x=40 \]