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2 years ago

Can someone pls help

Mathematics

2 answers:

salantis [7]2 years ago

4 0

Answer:

I think 1, 3, and 5.

Step-by-step explanation:

Luba_88 [7]2 years ago

3 0

I believe the correct answer would be 5,1,3 :)

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Which expression is equivalent to (3b 2r) (4b r)? 7b 2r 7b 3r 12b 2r 12b 3r.

Maslowich

To add the variables, add the coefficients with same variable. The expression which is equivalent to given expression is $7b+3r$ . The option 2 is the correct option.

<h3>What is equivalent expression?</h3>

Equivalent expression are the expression whose result is equal to the original expression, but the way of representation is different.

Given information-

The expression given in the problem is,

$(3b+2r)+(4b+r)$

Let the resultant expression of the above expression is $x$ . thus,

$x=(3b+2r)+(4b+r)$

To add the algebraic terms open the brackets first,

$x=3b+2r+4b+r$

Separate the same variable terms,

$x=3b+4b+2r+r$

To add the variables, add the coefficients with same variable. Thus,

$x=7b+3r$

Hence, the expression which is equivalent to given expression is $7b+3r$ . The option 2 is the correct option.

Learn more about the equivalent expression here;

brainly.com/question/2972832

4 0

2 years ago

Ahhh hi pls help <br> f(x)=-2x^2+3

nikklg [1K]

Answer:

Step-by-step explanation:

F(x) is another name for y

If you make a table of values, you can plot the coordinates of this quadratic equation.

When "x" is 0, y is 3

7 0

3 years ago

B. In three to five sentences, write the significance of function in showing real-life

timurjin [86]

Enter an image, please then people would understand.

5 0

3 years ago

Many companies use well-known celebrities as spokespersons in their TV advertisements. A study was conducted to determine whethe

s2008m [1.1K]

Answer:

There is enough evidence to support the claim that the proportion of brand awareness of female TV viewers and the gender of the spokesperson are not independent (P-value = 0.01537).

Step-by-step explanation:

<em>The question is incomplete: the picture attached gives the missing sample data.</em>

This is a hypothesis test for the difference between proportions.

The claim that is going to be stated in the alternative hypothesis is that the proportion of brand awareness of female TV viewers and the gender of the spokesperson are not independent. This means that the proportions differ significantly.

Then, the null and alternative hypothesis can be written as:

$H_0: \pi_1-\pi_2=0\\\\H_a:\pi_1-\pi_2\neq 0$

The significance level is 0.05.

The sample 1 (Male celebrity), of size n1=150 has a proportion of p1=0.273.

$p_1=X_1/n_1=41/150=0.273$

The sample 2 (Female celebrity), of size n2=150 has a proportion of p2=0.407.

$p_2=X_2/n_2=61/150=0.407$

The difference between proportions is (p1-p2)=-0.133.

$p_d=p_1-p_2=0.273-0.407=-0.133$

The pooled proportion, needed to calculate the standard error, is:

$p=\dfrac{X_1+X_2}{n_1+n_2}=\dfrac{41+61.05}{150+150}=\dfrac{102}{300}=0.34$

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

$s_{p1-p2}=\sqrt{\dfrac{p(1-p)}{n_1}+\dfrac{p(1-p)}{n_2}}=\sqrt{\dfrac{0.34*0.66}{150}+\dfrac{0.34*0.66}{150}}\\\\\\s_{p1-p2}=\sqrt{0.001496+0.001496}=\sqrt{0.002992}=0.055$

Then, we can calculate the z-statistic as:

$z=\dfrac{p_d-(\pi_1-\pi_2)}{s_{p1-p2}}=\dfrac{-0.133-0}{0.055}=\dfrac{-0.133}{0.055}=-2.44$

This test is a two-tailed test, so the P-value for this test is calculated as (using a z-table):

$P-value=2\cdot P(z$

As the P-value (0.01537) is smaller than the significance level (0.05), the effect is significant.

The null hypothesis is rejected.

There is enough evidence to support the claim that the proportion of brand awareness of female TV viewers and the gender of the spokesperson are not independent (the proportions differ).

6 0

3 years ago

Someone please help!!

zubka84 [21]

The answer would be 4.6 inches and 0.11 meters

3 0

3 years ago