## Final. E-books vs Printed textbooks/ Protect environment

Nowadays, with the rapidly increasing amount of environmental problems faced with human beings, people started realizing they should pay attention on environmental protection. Trees are always the necessity of human. Trees not only can provide people with air to breathe, … Continue reading

## Assignment 4: E-textbook vs Printed textbook

Nowadays, with the rapidly increasing amount of environmental problems faced with human beings, people started realizing they should pay attention on environmental protection. Trees are always the necessity of human. Trees not only can provide people with air to breathe, … Continue reading

## Final post 2 Solar power to PSU

Throughout of the history of human development, selecting the superior and eliminating the inferior is inevitable. At the very beginning, human can only get the fire from the forest fires causing of the thunderclap. Then, people start to light a … Continue reading

## Assignment 2:

Throughout of the history of human development, selecting the superior and eliminating the inferior is inevitable. At the very beginning, human can only get the fire from the forest fires causing of the thunderclap. Then, people start to light a … Continue reading

## bibliography 2: Is solar power the best option?

Topic: I want to figure out if the solar power the best option. If not, what kind of energy is the best? And, can Penn State solely depends on the Solar power to meet the daily demand and fulfill the … Continue reading

## 1, How can people save water at home in their daily life? final post

How can people save water at home in their daily life? Conservation of water is the most cost effective and environmentally friendly method of decreasing the water demand and the waste of water on the globe. The water is the … Continue reading

1.  $$x^3-3x^2-10x=0$$ 2.  $$(1+r)^n$$ 3.  $$(5.7\times 10^{-8})\times (1.6\times 10^{12})=9.12\times 10^4$$ 4.  $$(\pi)L[1-(\alpha)](R^2)=4(\pi)(\sigma)T^{4}R^2$$ 5.  $$12\text{km}\times\frac{0.6\text{mile}}{1\text{km}}\approx 7.2\text{mile}$$ $12\text{km}\times\frac{0.6\text{mile}}{1\text{km}}\approx 7.2\text{mile}$ 6.  $$4,173,445,346.50 \approx 4,200,000,000 = 4.2\times 10^9$$ 7.  $$50\text{m}\times\frac{3.4\times 10^6\text{kg}}{1\text{sec}}\times \frac{10\text{J}}{1\text{kg}\cdot 1\text{m}}=1.7\text{GW}$$ 8.  $$\5,000\times(1+0.012)^{30}\approx \7,150$$