All categories

3 years ago

(2x+3)(x-7) Please help

Mathematics

2 answers:

Sergeu [11.5K]3 years ago

6 0

Hello Brainly User,

I will walk you threw to solve this problem..

Solve : 2x+3 = 0

Subtract 3 from both sides of the equation :

2x = -3

Divide both sides of the equation by 2:

x = -3/2 = -1.500

Solve : x-7 = 0

Add 7 to both sides of the equation :

x = 7

So x can equal 7 or -3/2

Hope i helped i was glad to help and i hope you have a great rest of your day!

-Philaeagles14

nikdorinn [45]3 years ago

5 0

Answer:

2x^2-11x-21

Step-by-step explanation:

multiply each term in the first () by each term in the second (), calculate the product, collect the like terms

i hope i help:)

You might be interested in

Order Numbers least to greatest -4.3, 5/4 ,8.2, -6/2, 4, -2.5, 5.33

AnnyKZ [126]

-4.3,-6/2,-2.5,5/4,4,5.33,8.2

3 0

2 years ago

christen has to run around the rectangle soccer field during practice. The soccer field measures 60 meters long by 45 meters wid

Elena L [17]

Answer:

210 m

Step-by-step explanation:

Perimeter is the distance around the outside of a two-dimensional shape.

Area is the space inside of a two-dimensional shape. We can also think of area as the amount of space a shape covers.

Christen ran around the soccer field, so she ran around the perimeter.

We can find the perimeter by adding all of the side lengths.

Perimeter=60 m+45 m+60 m+45 m

Christen ran 210m.

7 0

3 years ago

Which number line and equation show how to find the distance from -2 to - 5?

Lady bird [3.3K]

Answer:

Step-by-step explanation:

If you're concerned with the points -2 and -5, you would be looking for a number line with those points plotted on it. The only one is ...

number line B

6 0

2 years ago

A university interested in tracking its honors program believes that the proportion of graduates with a GPA of 3.00 or below is

stealth61 [152]

Answer:

a) On this case we are interested on the population proportion of students that have a GPA of 3.00 or below.

b) $z=\frac{0.15 -0.2}{\sqrt{\frac{0.2(1-0.2)}{200}}}=-1.77$

$p_v =P(z$

c) Null hypothesis: $p\geq 0.2$

Alternative hypothesis: $p$

d) The significance level provided is $\alpha=0.05$ . If we compare the p value obtained and the significance level given $\alpha=0.05$ we have $p_v$ so we can conclude that we have enough evidence to reject the null hypothesis, and we can said that at 5% of significance the population proportion of students that have a GPA of 3.00 or below is significantly lower than 0.2.

Step-by-step explanation:

Data given and notation n

n=200 represent the random sample taken

X=30 represent the students with a GPA of 3.00 or below.

$\hat p=\frac{30}{200}=0.15$ estimated proportion of students with a GPA of 3.00 or below.

$p_o=0.2$ is the value that we want to test

$\alpha$ represent the significance level

z would represent the statistic (variable of interest)

$p_v$ represent the p value (variable of interest)

a. In testing the university's belief, how does on define the population parameter of interest?

On this case we are interested on the population proportion of students that have a GPA of 3.00 or below.

Concepts and formulas to use

We need to conduct a hypothesis in order to test the claim that the proportion of graduates with GPA of 3.00 or below is less than 0.2.:

Null hypothesis: $p\geq 0.2$

Alternative hypothesis: $p$

When we conduct a proportion test we need to use the z statistic, and the is given by:

$z=\frac{\hat p -p_o}{\sqrt{\frac{p_o (1-p_o)}{n}}}$ (1)

The One-Sample Proportion Test is used to assess whether a population proportion $\hat p$ is significantly different from a hypothesized value $p_o$ .

b. The value of the test statistics and its associated p-value are?

Since we have all the info requires we can replace in formula (1) like this:

$z=\frac{0.15 -0.2}{\sqrt{\frac{0.2(1-0.2)}{200}}}=-1.77$

It's important to refresh the p value method or p value approach . "This method is about determining "likely" or "unlikely" by determining the probability assuming the null hypothesis were true of observing a more extreme test statistic in the direction of the alternative hypothesis than the one observed". Or in other words is just a method to have an statistical decision to fail to reject or reject the null hypothesis.

Since is a one left tailed test the p value would be:

$p_v =P(z$

c. In testing the university's belief, the appropriate hypothesis are?

Null hypothesis: $p\geq 0.2$

Alternative hypothesis: $p$

d. At a 5% significance level, the decision is to?

The significance level provided is $\alpha=0.05$ . If we compare the p value obtained and the significance level given $\alpha=0.05$ we have $p_v$ so we can conclude that we have enough evidence to reject the null hypothesis, and we can said that at 5% of significance the population proportion of students that have a GPA of 3.00 or below is significantly lower than 0.2.

5 0

3 years ago

What is the distance between the points 4,10 and -3,-14 on the coordinate plane

Kryger [21]

Answer:

Step-by-step explanation:

Here we are supposed to find the distance between two coordinates ( 4,10) and (-3,-14).

Let us do this step by step with detailed explanation.

We will use distance formula in order to find the distance between them. The distance formula is given as

$D=\sqrt{(x_{2}-x_{1})^{2} +(y_{2}-y_{1})^{2} }$