3. Air is being pumped into a spherical balloon so that its volume is increasing at a rate of \( 200 \mathrm{~cm}^{3} / \mathrm{s} \), how fast it the radius of the balloon increasing when the diameter is \( 60 \mathrm{~cm}(1 \mathrm{D}=2 \mathrm{r}) \) Hint: \( \mathrm{V}=\frac{4}{3} \pi r^{3} \) Answer: \( \underline{\mathrm{dr}} / \underline{\mathrm{dt}}=0.02 \mathrm{~cm} / \mathrm{s} \)

De un trozo de tela de 6 metros de largo cada dia se corta un pedazo de 40 cm . El primer corte se hace un día lunes. ¿En qué dia de la semana se hace el último corte?

O estado do Piaui tem área de \( 251.529 \mathrm{~km}^{2} \) e população de, aproximadamente, 3.118 .360 habitantes. Qual a densidade demográfica do estado do Piaul? Escolha 1 resposta: (A) \( D_{D} \approx 0,08 \mathrm{hab} / \mathrm{km}^{2} \) (D) \( D_{D} \approx 12,04 \mathrm{hab} / \mathrm{km}^{2} \) (c) \( D_{\mathrm{n}} \approx 12.40 \mathrm{hab} / \mathrm{km}^{2} \)

3. \( (2 b+9)(2 b-9) \)

Find the prime factorizations of \( 693,18850,781,937 \)

1. Rahmi bought 1 pair of jeans and 2 T-shirts. How much did Rahmi spend? Write equatio to solve. Use letters to represent unknown quantities.