The Domain is going to be ALL Real Numbers less what x cannot be in the denominator. So, set the denominator equal to zero and solve.
(x^2-1) is a difference of two squares and factors to: (x-1) (x+1) therefore, x cannot = 1
In Interval notation you find:
D:...

(4200)(5/8) = 2625
Hope that helps.
Teodor M.

8,046.72 meters converts to 5 Mi.
This can be found as follows:
(8046...

Change everything into 10ths as follows:
1/10 + 2.5/10 = 3.5/10 of an hour to make one bracelet. Then change to 20ths so the numerator is a whole number.
Divide your time available by the time it takes to make one.
...

Another way to look at this problem is that it is a special case 3-4-5 triangle at a 6-8-10 measurement. So, expect special cases in your math. This combination of sides comes up a lot and is the basis for much of the beauty in nature including the equal angular (Fibonacci) spiral.

3m/s is the correct for the average speed which is derived from the formula (Vf-Vi)/t or dV/dt

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x^2 -4x -5
We know it is a parabola
we know it faces up
we know the zeros or factors are "-" and a "+" and the "-" is greater
it factors to: (x-5)(x+1)
the zeros are x=5, -1 this is where...

6.3 * 7.8 are both 2 significant digits and 6.3 is more than 6 7.8 in almost 8 meaning it is over 48. The answer is 49.

As a fraction 19/5 is in its simplest form, however if you are looking for a mixed fraction it is 3 4/5

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