-4X +6= 4X -2
Americans certainly do use a lot of water. According to CBS News, the average American uses 150 gallons of water per day, while residents of the U.K. only use 40 gallons per day and residents of China use just 22 gallons per day.According to a new report released by the Natural Resources Defense Council, more than one-third of all counties in the lower 48 states will likely be facing very serious water shortages by 2050. That is just 38 years away. As water becomes more scarce and as big global corporations lock up available supplies, the price of water is almost certainly going to skyrocket. This will put even more economic pressure on average Americans.
Another popular opinion is that the amount of available freshwater is decreasing because of climate change. Climate change has caused receding glaciers, reduced stream and river flow, and shrinking lakes and ponds. Many aquifers have been over-pumped and are not recharging quickly. Although the total fresh Of water sweet don’t use not,but we have to continue to the water passion also needs.
water supply is not used up, much has become polluted, salted, unsuitable or otherwise unavailable for drinking, industry and agriculture. To avoid a global water crisis, farmers will have to strive to increase productivity to meet growing demands for food, while industry and cities find ways to use water more efficiently.
Although a mere 0.014% of all water on Earth is both fresh and easily accessible (of the remaining water, 97% is saline and a little less than 3% is hard to access), technically, there is a sufficient amount of freshwater on a global scale, for humanity to get by. However, due to unequal distribution (exacerbated by climate change) resulting in some very wet and some very dry geographic locations, plus a sharp rise in global freshwater demand in recent decades, humanity is facing a water crisis, with demand expected to outstrip supply by 40% in 2030, if current trends continue.
This world will not end by a world war, an asteroid, a virus, a natural disaster, a specificman-made disaster, or any of the other typical events people imagine. And it’s not that some (or even all) of these things won’t occur between now and the time of the End, and be extremely devastating to life on the planet, even significantly reducing the Earth’s population by their cumulative effects. and we know we will die.and for finish the water of the earth.and the humans cant do anything.
what questions did you need to research in order to research your topic?
the important question i have been researching about is water shortages.and do people have a way to prevent water shortages? but the answer i did not get was,why do not they find a way to convert water to food.
what new of familiar digital tools did you try to use as you worked through this project?
i helped the school library site but google and vicipedia helped me a lot too.
what was the process you used to investigate the topic?
I’m always afraid of dying and I’m scared of a lot of water. In my country there is a watering day that he has been dry for a long time. My country is very warm. In return, Canada is. But the problem is that water scarcity is a serious problem. Because we have water, but there is little water or sweet water.
how did you verify and cite the information you found?
I did not have much to do with the library site, and I received more answers than Wikipedia. Under Wikipedia, the entire text can be translated into another language, and I could more easily figure out what I’m writing and what I’m answering. Of course, most of my answers came from Google.
how did the process of completing this challenge go?what could you have done better?
This project helped me get started with the elementary science of science at the beginning of the science class. I find the biggest question I have, which has its own hardship. The greatest of them was that this was my first project in English.
The upper number in the bracket represents the number on the horizontal axis, x-axis or longitudinal axis.
The lower number in the bracket shows the number on the vertical axis, the y axis or the transverse axis.
To find the coordinates of a point, we must start counting from the beginning of the axis or origin of the coordinate axis, which is a zero point.
I enterviewed to Spanish teacher in my school.she is not latina but she is Spanish teacher.
I chose this person for an interview. Because in Canada many people can speak Spanish.
I learned that she teach Spanish with love.
_Why are you passionate about your job?
She said: i love spanish and she love to get kids ready for traveling and she like to encourage traveling
_what obstacles have you faced to get you where you are today?
She said:for teach now i went to the university at long time and it is too expensive.
_what advice would you pasd on to someone interested in what yo are doing?
She said first it is a job shadow a teacher
_Would you be open to further contact from riverside students and if so,how can someone contact you?
She said sure you can email to me and my email is : @slotter.sd43.bc.ca
_If you can choose the high school children or middle school for teaching,which one you choose?
She said: high school becouse they can think more deeply and they learn faster pase
_How many years you are teach Spanish?
she said 21 years.
(The last picture is a her class room and it is cute)
In mathematics, an expression or mathematical expression is a finite combination of symbols that is well-formed according to rules that depend on the context. Mathematical symbols can designate numbers (constants), variables, operations, functions, brackets, punctuation, and grouping to help determine order of operations, and other aspects of logical syntax
The use of expressions ranges from the simple:
to the complex:
Consider the expressionsand . Both are equal to . That is, they are equivalent expressions.
Now let us consider some expressions that include variables, say.
The expression can be rewritten as.
We can re-group the right side of the equation toor or some other combination. All these expressions have the same value, whenever the same value is substituted for . That is, they are equivalent expressions.
Two expressions are said to be equivalent if they have the same value irrespective of the value of the variable(s) in them.
In mathematics, a polynomial is an expression consisting of variables (also called indeterminates) and coefficients, that involves only the operations of addition, subtraction, multiplication, and non-negative integer exponents of variables. An example of a polynomial of a single indeterminate x is x2 − 4x + 7. An example in three variables is x3 + 2xyz2 − yz + 1.
Polynomials appear in a wide variety of areas of mathematics and science. For example, they are used to form polynomial equations, which encode a wide range of problems, from elementary word problems to complicated problems in the sciences; they are used to define polynomial functions, which appear in settings ranging from basic chemistry and physics to economics and social science; they are used in calculus and numerical analysis to approximate other functions. In advanced mathematics, polynomials are used to construct polynomial rings and algebraic varieties, central concepts in algebra and algebraic geometry.
The x occurring in a polynomial is commonly called either a variable or an indeterminate. When the polynomial is considered as an expression, x is a fixed symbol which does not have any value (its value is “indeterminate”). It is thus more correct to call it an “indeterminate”. However, when one considers the function defined by the polynomial, then x represents the argument of the function, and is therefore called a “variable”. Many authors use these two words interchangeably.
It is a common convention to use uppercase letters for the indeterminates and the corresponding lowercase letters for the variables (arguments) of the associated function.
It may be confusing that a polynomial P in the indeterminate x may appear in the formulas either as P or as P(x).
Normally, the name of the polynomial is P, not P(x). However, if a denotes a number, a variable, another polynomial, or, more generally any expression, then P(a) denotes, by convention, the result of substituting x by a in P. Thus, the polynomial P defines the function
which is the polynomial function associated to P.
Frequently, when using this function, one supposes that a is a number. However one may use it over any domain where addition and multiplication are defined (any ring). In particular, when a is the indeterminate x, then the image of x by this function is the polynomial P itself (substituting x to x does not change anything). In other words,
This equality allows writing “let P(x) be a polynomial” as a shorthand for “let P be a polynomial in the indeterminate x“. On the other hand, when it is not necessary to emphasize the name of the indeterminate, many formulas are much simpler and easier to read if the name(s) of the indeterminate(s) do not appear at each occurrence of the polynomial.