Write f(x) / g(x) = 1 / ((x+1)(x-2)).

It's easy to see that x cannot be -1 and 2;
So all real numbers exclude -1 and 2, which matches the second choice.

6 0

3 years ago

What is the surface area of a triangular pyramid if each face has an area of 30 mm2?

coldgirl [10]

The answer must be $120\quad m{ m }^{ 2 }$ since the triangular pyramid has 4 faces and each has an area of 30 $m{ m }^{ 2 }$ we should multiply that by 4 , so :

$4\cdot 30\quad m{ m }^{ 2 }=\quad 120\quad m{ m }^{ 2 }$

7 0

3 years ago

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A coin contains 1.25 grams of nickel and 3.75 grams of copper, for a total weight of 5 grams. What percentage of the metal in th

otez555 [7]

So,

To find the percentage that the copper comprises, just divide the amount of copper by the total amount of metal in the coin. In this case, we will change the denominator so that it is 100, which can easily be converted into a percentage, which is really just a fraction out of 100.

$\frac{3.75}{5} = \frac{7.50}{10} = \frac{75}{100}$

75%

75% of the metal in the coin is copper.

7 0

3 years ago