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4 years ago

PLZ HELP ME ASAP I WILL GIVE THE BRAINLEST!!!

Mathematics

2 answers:

kobusy [5.1K]4 years ago

5 0

b since it is equal and graeter than -7

antiseptic1488 [7]4 years ago

4 0

The number line D, because it is asked for all values smaller than -7, including -7, which is represented with black dot.

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C= 5 9 (F−32) Can someone please help me with this

denis23 [38]

Answer:

The equation above shows how temperature F, measured in degrees Fahrenheit, relates to a temperature C, measured in degrees Celsius. Based on the equation, which of the following must be true?

A temperature increase of 1 degree Fahrenheit is equivalent to a temperature increase of

degree Celsius.

A temperature increase of 1 degree Celsius is equivalent to a temperature increase of 1.8 degrees Fahrenheit.

A temperature increase of

degree Fahrenheit is equivalent to a temperature increase of 1 degree Celsius.

A) I only

B) II only

C) III only

D) I and II only

Step-by-step explanation:

5 0

3 years ago

A certain function h(x) contains the point (8,-2). Find the value of h^-1(-2) . Explain your answer.

pychu [463]

Given:

A certain function h(x) contains the point (8,-2).

To find:

The value of $h^{-1}(-2)$ .

Solution:

If a function is defined as

$f(x)=\{(a,b):a\in R,b\in R\}$

Then, its inverse is defined as

$f^{-1}(x)=\{(b,a):a\in R,b\in R\}$

It is given that, a certain function h(x) contains the point (8,-2). It means, its inverse $h^{-1}(x)$ contains the point (-2,8). So, the value of inverse function is 8 at x=-2, i.e.,

$h^{-1}(-2)=8$

Therefore, the value of $h^{-1}(-2)$ is 8.

4 0

3 years ago

Test the null hypothesis Upper H 0 : (mu 1 minus mu 2 )equals 0H0: μ1−μ2=0 versus the alternative hypothesis Upper H Subscript a

Law Incorporation [45]

Answer:

The test statistic t is t=2.9037.

The null hypothesis is rejected.

For a significance level of 0.05, there is enough evidence to support the alternative hypothesis.

Step-by-step explanation:

The question is incomplete:

The sample 1, of size n1=25 has a mean of 1.15 and a standard deviation of 0.31.

The sample 2, of size n2=25 has a mean of 0.95 and a standard deviation of 0.15.

This is a hypothesis test for the difference between populations means.

The null and alternative hypothesis are:

$H_0: \mu_1-\mu_2=0\\\\H_a:\mu_1-\mu_2\neq 0$

The significance level is α=0.05.

The difference between sample means is Md=0.2.

$M_d=M_1-M_2=1.15-0.95=0.2$

The estimated standard error of the difference between means is computed using the formula:

$s_{M_d}=\sqrt{\dfrac{\sigma_1^2+\sigma_2^2}{n}}=\sqrt{\dfrac{0.31^2+0.15^2}{25}}\\\\\\s_{M_d}=\sqrt{\dfrac{0.119}{25}}=\sqrt{0.005}=0.069$

Then, we can calculate the t-statistic as:

$t=\dfrac{M_d-(\mu_1-\mu_2)}{s_{M_d}}=\dfrac{0.2-0}{0.069}=\dfrac{0.2}{0.069}=2.9037$

The degrees of freedom for this test are:

$df=n_1+n_2-1=25+25-2=48$

This test is a two-tailed test, with 48 degrees of freedom and t=2.9037, so the P-value for this test is calculated as (using a t-table):

$P-value=2\cdot P(t>2.9037)=0.0056$

As the P-value (0.0056) is smaller than the significance level (0.05), the effect is significant.

The null hypothesis is rejected.

8 0

4 years ago

Last month you swam the 50 meter freestyle in 28.38 seconds. Today you swam it in 27.33 seconds. What is your percent of change?

Phantasy [73]

Answer:

The distance is the same(50 meters). So we will operate only with numbers 28.38 and 27.33.

The difference is 28.38-27.33=1.05

So the percent of change is (1.05/28.38)*100%≈3.7%

The answer is 3.7%

Step-by-step explanation:

nice bnha pfp btw

3 0

3 years ago

darnell's car used 8 gallons of gasoline to travel 340 miles. after a mechanic work on teh car, it used 7 gallons of gasoline to

Radda [10]

What we are going to do for this case is find the cost for each case:
Cost to run the car before the mechanic worked on it:
 $(4) * (8) = 32 dollars

(32) * (1/340) = 0.09 dollars / mile$
 Cost to run the car after the mechanic worked on it:
 $(4) * (7) = 28 dollars 

(28) * (1/350) = 0.08 dollars / mile$ 
The difference between both cases is:
 $0.09 - 0.08 = 0.01 dollars / mile
$
 Answer:
It cost to run the car after the mechanic worked on it 0.01 $ / mile less than before the mechanic worked on it.

5 0

4 years ago