3 years ago

Eric bought 300 t-shirts, which were sold in packs of 12. How many packs did Eric buy?

Mathematics

2 answers:

kipiarov [429]3 years ago

7 0

The answer is B. 25
300 divided by 12 = 25.

taurus [48]3 years ago

5 0

Answer is B, 25, because 300 Divided 12 is 25 & 25x12=300.

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Which is the inverse of the function f(x) = x2 − 4?

Rudiy27

The function is not one-to-one function, hence the inverse doesn't exist for the whole domain of the function. But if we restrict the domain to $x\in(-\infty,0]$ or $x\in[0,\infty)$ , then we can give the inverse.

$f(x)=x^2-4\\\\y=x^2-4\\\\x^2=y+4\\\\x=\sqrt{y+4} \vee x=-\sqrt{y+4}\\\\f^{-1}(x)=\sqrt{x+4}\vee f^{-1}(x)=-\sqrt{x+4}$

So, when $D_{f(x)}:x\in(-\infty,0]$ , the inverse is $f^{-1}(x)=-\sqrt{x+4}$ and when $D_{f(x)}:x\in[0,\infty)$ , the inverse is $f^{-1}(x)=\sqrt{x+4}$ .