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3 years ago

Could someone please help!!

Mathematics

2 answers:

Mkey [24]3 years ago

7 0

Answer:

2x > 7

Step-by-step explanation:

The open circle is at approximately x = 3.5, so the inequality represented by the line from there to the right is ...

x > 3.5

The inequality you are given to complete has 2x, so you would need to multiply both sides of this by 2:

2x > 7

ziro4ka [17]3 years ago

6 0

Answer:

2x > 7

Step-by-step explanation:

im not completely sure this is right, but im giving this my best shot.

since the number line shows that x is greater than 3.5 (x > 3.5), and it is asking for the 2x value of that, I simply just doubled the first value (3.5).

to check, just plug any number greater than 3.5 as x.

(ex.: 2(5) > 7)

(which will be 10>7 so the statement is true)

I think you can simply plug in an x value from the number line that is true, just like 5 in that occasion, since x > 3.5, and 5 is indeed greater than 3.5 (5>3.5)

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A research engineer for a tire manufacturer is investigating tire life for a new rubber compound and has built 16 tires and test

frutty [35]

Answer:

The 95% confidence interval for mean tire life is between 52,368.4 kilometers and 67,911 kilometers.

Step-by-step explanation:

We are in posession of the sample's standard deviation, so we use the students t-distribution to solve this question.

The first step to solve this problem is finding how many degrees of freedom, we have. This is the sample size subtracted by 1. So

df = 16 - 1 = 15

95% confidence interval

Now, we have to find a value of T, which is found looking at the t table, with 15 degrees of freedom(y-axis) and a confidence level of [tex]1 - \frac{1 - 0.95}{2} = 0.975. So we have T = 2.68

The margin of error is:

M = T*s = 2.1315*3645.94 = 7771.3

In which s is the standard deviation of the sample.

The lower end of the interval is the sample mean subtracted by M. So it is 60139.7 - 7771.3 = 52,368.4.

The upper end of the interval is the sample mean added to M. So it is 60139.7 + 7771.3 = 67,911.

The 95% confidence interval for mean tire life is between 52,368.4 kilometers and 67,911 kilometers.

3 0

3 years ago

Read 2 more answers

In one game, the ratio of three-point baskets to three-point tries for one team was 3:8. If the team scored 27 points from three

nasty-shy [4]

Since we’ve been given a ratio, 3:8, we can convert that into a fraction and form an equation from it:

$\frac{3}{8}$ = $\frac{27/3}{?}$

The reason the numerator on the second fraction is 27/3 is because the team scored 27 points, not 27 baskets.

Simplify (Also replace the ? with an unknown variable):

$\frac{3}{8}$ = $\frac{9}{n}$

Cross multiply:

3*n = 9*8

Simplify:

3n = 72

Divide both sides by 3:

n = 24

The team had 33 three point tries, 9 successes, and 24 fails.

-T.B.

7 0

3 years ago

Help plz i need help PLZ I HAVE A MATH TEST :(((((((((((

Naddik [55]

اختي هلق اذا نزلنا من الزاوية الثانية خط منحسن نلاقي مستطيل ونحيب مساحته ويلي هية ١٢ متر مربع

بعدين منطلع الضلعين الموجودين يلي لح يكونو نفس القيمة

يعني هوو كمان مستطيل ١٤×٤=٥٦

٥٦+١٢=٦٨

يعني الجواب ٦٨ متر مربع ان شاء الله يكون صح لاني حليته نظرياً

3 0

3 years ago

Read 2 more answers

In order to make 14 oz of a milk-coffee drink with a pH of 5.8, how many ounces of each are required?

muminat

I think it's 2.4dhhryhhg

8 0

3 years ago

Sarawong's school is selling tickets to the annual talent show. On the first day of ticket sales the

SIZIF [17.4K]

Answer:

Price of the adult ticket is $13

Price of the child ticket is $3

Step-by-step explanation:

Lets x be the adult ticket and y be the child ticket.

Given:

School sold 14 adult tickets and 14 child tickets for a total of $224, so the first equation is.

$14x+14y=224$ -------------(1)

And the school took in $44 on the second day by selling 2 adult tickets and 6 child tickets, so the second equation is.

$2x+6y=44$ ---------------(2)

We find the price of an adult ticket and the price of a child ticket by solving above system of equation.

Now, equation 2 multiplied by 7.

$7(2x+6y=44)$

$14x+42y=308$ ---------(3)

Now, equation 1 subtracted by equation 3.

$14x+42y=308$

$14x+14y=224$

-______________

14x is cancelled in both equations, so we get the equation.

$28y=84$

$y=\frac{84}{28}$

y = 3

Now, we substitute y = 3 in equation 2.

$2x+6(3)=44$

$2x+18=44$

$2x=44-18$

$2x=26$

$x=\frac{26}{2}$

x = 13

Therefore, the price of the adult ticket is $13 and the price of the child ticket is $3.

3 0

3 years ago