CPhill

I'm afraid I don't understand your question......what "missing" fractions??

What is 20 in scientific notation?

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20 = 20.0

Move the decimal so that only one non-zero digit is to its left.

Thus, we have

2.0      Then, multiply this times 10 raised to a positive exponent indicating the number of places the decimal was moved.  So we have

2.0 x 10 ¹ 

Moving the decimal to the left is indicated by a positive exponent. Moving it to the right results in a negative exponent.

Well...Anonymous #2....much of Da Vinci's art - particularly, his studies in perspective - is based on mathematics. And "math" does pay for some meals....ask any actuary.

What might be of interest to you may not be of interest to some others and vice-versa.

Also, we don't need the language on here. People who do this show their ignorance.

I was curious on how to find the Arcsin and Arcos Arctan and the inverse in degress. and how to find the radians.

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The on-site calculator will do that for you....hit the 2nd button to access the inverse trig functions. You can choose either degree or radian measure.

Note, that if you want the radian measure in terms of pi, use the conversion:

(inverse value returned in degrees) X  (pi) / 180

Also, take care to remember in which quadrant the angle lies !! For instance, sin^-1(1/2) = 30°. But this angle might also be a 30° angle in the second quadrant, i.e., 150°.

Here's the graph of y = sec(x)

Notice that the period = 2π rads

nverse function of log6(x+1)

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I'm assuming that you mean this:   y = log₆ (x + 1)

Let's write this in exponential form, we have

6^y = (x + 1)           Now get x by itself

6^y - 1  = x              Now "exhange" x and y

6^x - 1  = y              Now, write y  as f^-1(x)

f^-1(x) = 6^x - 1

Notice that the "log" graph has a restricted domain ......i.e., x > -1

And notice that the range of the inverse is y (or f^-1(x))  > -1

how would we do 42 - 12 ÷ 6 × 2 + 7 in order of operations

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We first perform any multiplications / divisions as we encounter them from left to right....so we have

42 - (12 / 6) X 2 + 7     =

42 - (2 x 2)  + 7           =

42 - 4 + 7                    =

38 + 7                         =

45

Notice that this would have been better written as:

42 - [ (12/6) X 2]  + 7      Here, it's clear that we should work inside the brackets first !!

At which value will the graph of y=cot x have a zero?   a. pi/2 b. pi/4 c. pi/3 d. none of the above.

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Remember that the cotangent is given by x / y.   So this is 0 where x = 0. Notice that this occurs at pi/2 where, on the unit circle, x = 0 and y = 1.

the sum of two numbers is 27. their difference is 5. find the number

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Let x be the first number and y be the second number    ...   so we have

x + y  = 27

x - y  =   5            Adding the equations, we have

2x = 32                Dividing through by 2, we have

x = 16                  And substituting  or x in the first equation, we have

16 + y  = 27         Subtract 16 from both sides  

y = 11