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3 years ago

An entomologist can model the number of mosquitos in a forest as a function of rainfall.

Mathematics

2 answers:

Alja [10]3 years ago

7 0

Answer: d :)

Step-by-step explanation:

Nesterboy [21]3 years ago

7 0

Answers:

B and D

Step-by-step explanation:

B - This intersects really show us amount of rainfalls (x values) for amount of mosquitoes = 3 millions

D - We can find intersects for this equations if we combine them to one equation

C - We have no intersect of x=3

A - Intersects don't show the same values for x and y

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3 years ago

The probability distribution for a random variable x is given in the table.

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Answer:

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2 years ago

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3 years ago

What is the sign of f on the interval -2

TEA [102]

Answer:

$f$ is sometimes positive and sometimes negative.

Step-by-step explanation:

$f(x)=(x-3)(x+2)(x+4)(x+4)(x-1)(2x-9)$

Take $x=-1\in(-2,\frac{9}{2})\ as-2$

$f(-1)=(-1-3)(-1+2)(-1+4)(-1-1)(-2-9)\\\\=(-4)(1)(3)(-2)(-11)\\\\=-264\\\\f(-1)$

Take $x=2\in(-2,\frac{9}{2})\ as\ -2$

$f(2)=(2,-3)(2+2)(2+4)(2-1)(2\times2-9)\\\\=(-1)(4)(6)(1)(-5)\\\\=120\\\\f(2)>0$

Hence $f(x)$ for $x=-1$ and $f(x)>0$ for $x=2$

So $f$ is sometimes positive and sometimes negative in the interval.

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3 years ago