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   What is meaning of pi?     

   If you mean the math quantity pi, then it is     

                   circumference of a circle     

        π  =  –––––––––––––––––––––––     

                    diameter of that circle     

   That quotient will be about 3.1416 every time,     

   for every circle, no matter which circle you use.     

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How do you get the inverse of sin, cos, and tan on a scientific calculator? For Example: sin-1     

Try clicking the 2^nd Function button.  That's how it works on my calculator.     

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The longest bridge in the world is located in China. It is164,800 meters long. Another bridge in China is 69,732 meters long. Round each length to the nearest ten thousand to find the answer. What is the approximate difference between the lengths of the two bridges?     

164,800  rounded to nearest 10,000     =     160,000     

  69,732  rounded to nearest 10,000     =       70,000     

    subtract to obtain difference                       90,000     

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  Approximate the given number​ (a) rounded and​ (b) truncated to three decimal places. 31.69131     

  (a)  Rounded to ___ significant digits?  Not enough info.     

        Or, rounded to a whole number?  That would be 32.     

  (b)  Truncated to three decimal places.  That is 31.691.     

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  6C4     

  This is a mathematical expression for combinations.     

  It means the combination of six items taken four at a     

  time, also called "six choose four" sometimes.     

  It represents the number of different ways to select     

  four items from a group of six when the sequence of     

  selection does not matter. The value of 6C4 is 15.     

  An example, using smaller numbers could be 3C2 = 3.     

  The three combinations of A,B,C are AB, AC, and BC.     

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The answer is 25/3.

The answer is 2*sqrt(2).

Reduce to the simplest form: −17/136     

                                      – 1/8     

Multiply, then write answer in simplest form. (−5/10) ⋅ (−8/6)     

                                                            + 2/3     

Multiply, then write answer in simplest form. 5/2 ⋅ (−10/1)     

                                                             – 25     

Divide, then write answer in simplest form. 8/2 ÷ (−2/4)     

                                                           – 8     

Divide these fractions then simplify your answer.  (−7/2) ÷ (−4/9)     

                                                                 + 7 ⁷/₈     

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   what is the equation for pie     

   If you mean the math quantity pi, then it is     

                   circumference of a circle     

        π  =  –––––––––––––––––––––––     

                    diameter of that circle     

   That quotient will be about 3.1416 every time.     

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For a school trip. Maria decides to order T-shirts for everyone. It costs $4 for a medium size, and $5 for a large size. She orders a total of 70 shirts and spends a total of $320. How many are medium shirts?     

  L +  M   =  70     multiply both sides by 5  —>   5L + 5M  =  350     

5L + 4M  =  320                                          —>    5L + 4M  =  320     

                             subtract to obtain           —>             M  =  30     

                             and since L + M = 70     —>              L  =  40     

   check answer     

   Does  (5)(40) + (4)(30)  =  320   ?     

                  200  +  120     =  320   ?     

                                  320  =  320   True     

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   Factorise x^2-36     

   x² – 36  =  (x + 6) (x – 6)     

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   Does kinetic energy always produce sound?     

   Nope.  What we perceive as sound is transmitted by air vibrations.     

   Some places, for example outer space, have no air, thus no sound.     

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   245 is what percent of 798     

   798 • X  =  245     

            X  =  245 / 798     

            X  ≈  0.3070     

   expressed as a percent:  0.3070 • 100  =  30.70 %     

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   20g + 12 = -12 + 18g     

   What you do to one side,     

   do the same to the other.     

                                     20g + 12  =  –12 + 18g     

   subtract 12                20g + 12 – 12  =  –12 + 18g – 12     

   leaves you                 20g  =  –24 + 18g     

   now sub 18g              20g – 18g  =  –24 + 18g – 18g     

   leaves you                              2g  =  –24     

   divide by 2                                g  =  –12     

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