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DiKsa [7]
3 years ago
13

Which statement is not always true ?

Mathematics
1 answer:
Alona [7]3 years ago
5 0
There is no statements to choose from
You might be interested in
Identify the reason that justifies the statement.
Amiraneli [1.4K]

Answer:

C; Substitution property

Step-by-step explanation:

Here, we want to find the justification that justifies the written equation;

If PQ + RS = PS

and RS = XY

then PQ + XY = PS

What we simply did is to substitute RS for XY in the second equation;

The correct answer is Substitution property

It can be fully referred to as the substitution property of equality.

What it simply means in a nut shell is that since XY and RS are equal, then in any addition or arithmetic equation, we can make a substitution of XY for RS since they are equal to each other

5 0
3 years ago
A line has a rise of 6 and a slope of 1/20 . What is the run?
Lerok [7]

Answer:

120

Step-by-step explanation:

\text{ Slope }=\frac{\text{ Rise }}{\text{ Run }}.

Plug in the information given:

\frac{1}{20}=\frac{6}{\text{ Run }}.

Now we want to solve this equation for Run.

If you don't like Run as a variable, let's just use x in it's place:

\frac{1}{20}=\frac{6}{x}

Cross multiply:

1(x)=20(6)

Simplify both sides:

x=120

The run is 120.

Let's check our work.

\text{ Slope }=\frac{\text{ Rise }}{\text{ Run }}.

So if our rise is 6 and our run is 120.

Does 6/120 reduce to 1/20?

6 and 120 do have a common factor of 6.

So if you divide top and bottom of 6/120 by 6 you do get 1/20.

8 0
3 years ago
Read 2 more answers
Determine the number of solutions for the quadratic function f(x) = -x^2 + 3x - 9.
Setler79 [48]

Answer:

0

Step-by-step explanation:

Rewrite the equation as x^2-3x+9=0

find the determinant.

D = b^2-4ac = (-3)^2-4*1*9 <0

no solution

7 0
3 years ago
The weight of National Football League (NFL) players has increased steadily, gaining up to 1.5 lb. per year since 1942. Accordin
GuDViN [60]

Answer:

The probability that the sample mean weight will be more than 262 lb is 0.0047.

Step-by-step explanation:

The random variable <em>X</em> can be defined as the weight of National Football League (NFL) players now.

The mean weight is, <em>μ</em> = 252.8 lb.

The standard deviation of the weights is, <em>σ</em> = 25 lb.

A random sample of <em>n</em> = 50 NFL players are selected.

According to the Central Limit Theorem if we have an unknown population with mean <em>μ</em> and standard deviation <em>σ</em> and appropriately huge random samples (<em>n</em> > 30) are selected from the population with replacement, then the distribution of the sample means will be approximately normally distributed.

Then, the mean of the sample means is given by,

\mu_{\bar x}=\mu

And the standard deviation of the sample means is given by,

\sigma_{\bar x}=\frac{\sigma}{\sqrt{n}}

The sample of players selected is quite large, i.e. <em>n</em> = 50 > 30, so the central limit theorem can be used to approximate the distribution of sample means.

\bar X\sim N(\mu_{\bar x}=252.8,\ \sigma_{\bar x}=3.536)

Compute the probability that the sample mean weight will be more than 262 lb as follows:

P(\bar X>262)=P(\frac{\bar X-\mu_{\bar x}}{\sigma_{\bar x}}>\frac{262-252.8}{3.536})\\\\=P(Z>2.60)\\\\=1-P(Z

*Use a <em>z</em>-table for the probability.

Thus, the probability that the sample mean weight will be more than 262 lb is 0.0047.

6 0
3 years ago
Please help I’ll give brainliest
Tanzania [10]

Answer:

it answer would be 50% coz we take out percentage from 100.

Step-by-step explanation:

first add 17% and 33% it would be 50%

then subtract 50%from 100%

answer would be 50%

8 0
3 years ago
Read 2 more answers
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