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Answers by Heng X.

Draw a number line. Don't be lazy, really draw and put numbers and arrows on it.    One number is 5, find 5 on you line and make it dot bigger.   The distance between two numbers is 4. Now look at the line, you have a number, 5, and you need another number, which is...

Kay,   Opinions are your own. Tutors are not supposed to come up with opinions for you.    In addition, those kinds of open-ended questions depend a lot on the contents of your class. Tutors need to know a lot more on what has been discussed in class to be of any meaningful...

As far as I know, math curriculum is determined at the district level. Different districts could adopt different curricula. The best resource is from the school you are going to join, ask what is used there.    In my area, 8th-grade math has algebra and plane geometry. If you are...

Light is transverse electromagnetic wave. Transverse means that the oscillation of energy is perpendicular to the direction of light.    Mathematically, there can be unlimited amount of directions in a space that are all perpendicular to a given line. In reality, this is the case...

Corry,   the common factor for both are (t-u), we can take it out:   (t-u)(s^2-9t^2)   And because a^2-b^2=(a+b)(a-b), in this case,    s^2-9t^2 =s^2-(3t)^2   [note: s=a, 3t=b in the above formula] =(s+3t)(s-3t)   So...

Daisy,   Law of Sine states: Sin(A)/a=Sin(B)/b=Sin(C)/c   In 1, you have A, a and c, you should be able to solve C by Sin(A)/a=Sin(C)/c, from C and A+B+C=180, you should also have B, then use the law of Sine again, you can have b.   For 2, it is the...

Nadia,   Logically, you look at who Gauchos are, what are their traditional cultures, maybe their history etc. Then you take another look at the current Argentinian society, look for similarities between them and the Gauchos. There are quite a few, depending on your perspectives.    It...

The reason people forget math afterwards, sometimes is because the logic is complicated. My solution to that is to break it down to pieces that you do remember. You said you worked hard and understood math. Before you take a break, while you still understand, pause and summarize your understanding...

I will give it a try: Microwave hotspots are caused by standing waves in the field, which is half-wavelength apart. In this case, the distance is 4 cm, i.e. wavelength=8 cm. speed of light in this case: c=wavelength*frequency=8 cm*300 MHz=2.4E+7 m/s If the frequency is fixed 300...

Essense of decimal is still fraction: 3.14=3+1/10+4/100. It is a way to represent a fraction by a set of common denominators: 1/10, 1/100... The advantage of decimals is that because all of them are in common denominators already, addition, subtraction and comparing are quite straightforward...