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2 years ago

Which statement is always true?

2 answers:

7 0

3, because a negative number multiplied by another negative number (in this case, itself) will always be a positive number.

Svetach [21]2 years ago

7 0

3. <span>A negative base raised to the power of 2 has a positive value.

Example ( -A ) ^ 2 = -A x -A = A^2

This is always true because, - x - = + </span>

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The function f(x) = 1(3)x models the number of virus cells present in a sample after x minutes. About how many cells will be pre

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Answer:omg im trying to find the answer too, did you ever figure it out

Step-by-step explanation:

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2 years ago

Amanda is studying relationships between the values and ages of different items. She decides to ask teachers at her school to es

Stels [109]

As te car gets older the value depreciates because it gets used and put through rough roads or accidents. the newer the car is the better shape it is in and the higher value it would have.

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2 years ago

1. Write an expression for 8 less than 2<br> times a number.

Nuetrik [128]

Answer:

8<2x

Step-by-step explanation:

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2 years ago

Read 2 more answers

The ages of trees in a forest are normally distributed with a mean of 25 years and a standard deviation of 4. Approximately what

harkovskaia [24]

Answer:

78.88%

Step-by-step explanation:

We have been given that

$\mu=25,\sigma=4,x_1=20,x_2=30$

The z-score formula is given by

$z-\text{score}=\frac{x-\mu}{\sigma}$

For $x_1=20$

$z_1=\frac{20-25}{4}\\\\z_1=-1.25$

For $x_2=30$

$z_2=\frac{30-25}{4}\\\\z_2=1.25$

Now, we find the corresponding probability from the standard z score table.

For the z score -1.25, we have the probability 0.1056

For the z score 1.25, we have the probability 0.8944

Therefore, the percent of the trees that are between 20 and 30 years old is given by

0.8944 - 0.1056

= 0.7888

=78.88%

6 0

2 years ago

Read 2 more answers

Establish for which constants c the following function is a density.

Valentin [98]

By "density" I assume you mean "probability density function". For this to be the case for $f(x)$ , we require

$\displaystyle\int_{-\infty}^\infty f(x)\,\mathrm dx=1$

Since

$f(x)=\begin{cases}cx^{1/2}&\text{for }0$

you have

$\displaystyle\int_{-\infty}^\infty f(x)\,\mathrm dx=\int_0^2cx^{1/2}\,\mathrm dx=\dfrac{2c}3x^{3/2}\bigg|_{x=0}^{x=2}=\dfrac{2^{5/2}c}3=1$

which means

$c=\dfrac3{2^{5/2}}=\dfrac3{4\sqrt2}$

7 0

2 years ago