All categories

2 years ago

Help please I’m so confused!

Mathematics

2 answers:

Archy [21]2 years ago

5 0

Three Ways how to solve- by graphing or using process of elimiation or process of :substitution

Line 1: 3x -y =6

Line 2: 4x +4y = -8

Substitution Method:

y = 3x - 6 (make line 1 equal to x)

then plug it as y into line 2 formula

4x + 4(3x - 6) = -8

Now solve

4x + 12x -24 = -8

16x = 16

x = 1

Elimination Method:

3x -y =6 (multiply the top by 4 to get rid of y )

4x +4y = -8

So, it changes to ...

12x - 4y = 24

4x +4y = -8

then add

16x = 16

x = 1

Graphing:

Plot both equations, then find the point where they intercept and find the x value and that should be your answer

The graph is attached.

x = 1

nadezda [96]2 years ago

3 0

(-1,-3) i will got for C.

You might be interested in

Help me please!! hurry up timed

Ad libitum [116K]

The quickest way to do this is to plug the first b-value from each table into the equation to find p-value. Then compare your answer with the p-value from the table to find the one that is greater than your answer.

p = 3.25b

Equation Table Table compared to Equation

Table A: p = 3.25(1) = 3.25 p = 2.75 <

Table B: p = 3.25(1.5) = 4.875 p = 3.75 <

Table C: p = 3.25(2) = 6.50 p = 7.00 >

Table D: p = 3.25(2.5) = 8.125 p = 10.00 >

Table E: p = 3.25(3) = 9.75 p = 11.25 >

Table F: p = 3.25(3.5) = 11.375 p = 10.50 <

Answer: C, D, and E

8 0

2 years ago

I will give brainlist to the most helpful answer to my question

sdas [7]

Answer:

See below

Step-by-step explanation:

Both horses travel 0 miles in 0 minutes. We can see this on the graph where both lines start at the 0 in the bottom left corner. For the purpose of writing the equations this also shows us that the y-intercept is 0. In a slope-intercept equation, y=mx+b, that number is the b. b is zero in both equations, so we don't need to write anything for that.

For horse A, we can see on the graph that at 4 minutes, horse A has traveled 1 mile. Also, confirming this rate, at 8 minutes, it went 2 miles. This will help us find the rate. The rate will be the number we fill in for the m in the y=mx+b equation. Horse A goes 1mile every 4 minutes. That is a rate of 1/4 miles per minute. So Horse A's equation will be

y = (1/4)x You can make it more *intuitive* possibly by using m for miles and t for time instead, like this:

m = (1/4)t

Horse B is a little bit faster, and you can see this bc the line is a little bit steeper. It goes 2 miles in 5 minutes (confirm you can see it goes 4 miles in 10 minutes)

So Horse B's equation is

y = (2/5)x

or miles = (2/5)time

Mathematically, the equations are the same whether you use x,y or m,t

If Horse A runs for 12 minutes then it will run

miles = (1/4)minutes

miles = (1/4)(12)

miles = 3

If Horse B runs for 12 minutes, then it will run

miles = (2/5)minutes

miles = (2/5)12

miles = 4.8

7 0

2 years ago

Margie received her store order on 12/3/16 at 4AM. She just opened one of the

Cerrena [4.2K]

Answer:

Exp Date: 1/17/2017

Exp Time: 4:00am

Prep Date: 12/3/2016

Prep Time: 4:00am

Initials: 12/7/2016

Step-by-step explanation:

A well-detailed version of the question has been uploaded in form of an image for easier understand.

Looking at the question, it was said that she received her store order on 12/3/2016 at 4am, this implies that the prep date and time are 12/3/2016 and 4am respectively. Also, it was said that the expiration date was printed on the product and it is 1/17/2017. Obviously, the expiration time would also be 4am because it was prepared at 4am and if we calculate in. 24hours we would get 4am at the expiration date as well. Lastly, we were told she opened the product she received on 12/7/2016 which is the initial date the product was used. From all these we can deduce the following:

Exp Date: 1/17/2017

Exp Time: 4:00am

Prep Date: 12/3/2016

Prep Time: 4:00am

Initials: 12/7/2016

8 0

2 years ago

9. On election day, registered voters go to a polling place to cast their vote. a. In a town, 273,600 votes were cast in an elec

spin [16.1K]

9.) 155,952 were in town
B.) yes he is correct because 60%= 164,160 which is less than the amount of votes

7 0

2 years ago

HighTech Inc. randomly tests its employees about company policies. Last year in the 560 random tests conducted, 26 employees fai

Tanzania [10]

Answer:

The 98% confidence interval for the proportion of applicants that fail the test is (0.025, 0.067).

Step-by-step explanation:

In a sample with a number n of people surveyed with a probability of a success of $\pi$ , and a confidence level of $1-\alpha$ , we have the following confidence interval of proportions.

$\pi \pm z\sqrt{\frac{\pi(1-\pi)}{n}}$

In which

z is the zscore that has a pvalue of $1 - \frac{\alpha}{2}$ .

For this problem, we have that:

560 random tests conducted, 26 employees failed the test. This means that $n = 560, \pi = \frac{26}{560} = 0.046$

98% confidence level

So $\alpha = 0.02$ , z is the value of Z that has a pvalue of $1 - \frac{0.02}{2} = 0.99$ , so $Z = 2.33$ .

The lower limit of this interval is:

$\pi - z\sqrt{\frac{\pi(1-\pi)}{n}} = 0.046 - 2.33\sqrt{\frac{0.046*0.954}{560}} = 0.025$

The upper limit of this interval is:

$\pi + z\sqrt{\frac{\pi(1-\pi)}{n}} = 0.046 + 2.33\sqrt{\frac{0.046*0.954}{560}} = 0.067$

The 98% confidence interval for the proportion of applicants that fail the test is (0.025, 0.067).

5 0

2 years ago