A civil engineer tested concrete samples to investigate the difference in strength, in newtons per square millimeter (N/mm2), between concrete hardened for 21 days and concrete hardened for 28 days. The engineer measured the strength from each sample, calculated the difference in the mean strength between the samples, and then constructed the 95 percent confidence interval, (2.9,3.1), for the difference in mean strengths.

Answers

Answer 1
48292959382828438822929
Answer 2

Answer:

d

Step-by-step explanation:


Related Questions

Write the polynomial that has factors of 2 and -6.

Answers

answer:

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



hope this helps, have a great day
mark brainliest :))!!

Answer: x^2 - 4x - 12

Step-by-step explanation:

Factors are (x + 2) and (x - 6)

    (x +2)(x - 6)

    *multiply the first x by the second x and then by the -6

       x^2 - 6x

    * multiply the 2 by the second x and then the -6

         2x - 12

  * combine the two expressions

   x^2 - 6x + 2x - 12

  *simplify

   x^2 - 4x - 12

The lines given by the equations y = 2x and y= 2x + 1 are
A. Parallel
B. Perpendicular
C. Neither Perpendicular nor parallel

Answers

A. is the answer i’m pretty sure

I don’t know the answer help pls

Answers

Answer: Option A

EXPLANATION: Trust me :)

Calculus, derivatives. Please help! Show work, if possible. Thanks! :)

Answers

[tex]y = x + \pi[/tex]

Step-by-step explanation:

We need to find the slope of the line tangent to y at [tex]x=-\pi[/tex] and we can do that by calculating the derivative of y at that point. We know that

[tex]y'(x) = \dfrac{d}{dx}(\tan{x}) = \sec^2{x}[/tex]

and

[tex]y'(-\pi) = \sec^2(-\pi) = 1[/tex]

To find the equation of the tangent line, we know that the line passes through the point [tex](-\pi, 0)[/tex] so we can write the slope-intercept form of the line's equation as

[tex]0 = (-\pi) + b \Rightarrow b = \pi[/tex]

Therefore, the equation of the line tangent to the point [tex]x = -\pi[/tex] is

[tex]y = x + \pi[/tex]

The graph of the two functions is shown above.

What is the equation of a line that passes trough (6,-1) and is parallel to the line that has a slope of -2/3?

Answers

Answer:

y=-2/3x+3

Step-by-step explanation:

First, identify the slope you need for your equation. The keyword here is "parallel" so the slope you need is the same as the given slope (-2/3).

Next, use the ordered pair (6,-1); it's on the line that you need to find the equation for. Using slope-intercept form (y=mx+b), plug the -1 in for y, plug the 6 in for x, and plug in your slope of -2/3 for m. Solve for b, your y-intercept. You should get 3.

You have your slope and y-intercept now. Create your equation:

y=-2/3x+3.

Victor has 2 times as many as trophies as Dean. Together , víctor and Dean have 27 trophies . How many trophies does víctor have?

Answers

Answer:

Victor has 18 trophies

Step-by-step explanation:

Let's set up "let statements"

Let d = Dean's trophies

Since Victor has 2 times as many trophies as Dean, we can set up a let statement for Victor like this...

Let 2d = Victor's trophies

Now we can set up an equation! Since we know Dean and Victor have 27 trophies altogether...our equation has to involve addition...

2d + d = 27

Combine like terms...(2d and d)

3d = 27

Divide 3 on both sides to isolate the variable "d"

3d ÷ 3 = d

27 ÷ 3 = 9

So...

d = 9

That means Dean has 9 trophies. But we are not done yet because we need to figure out how many trophies Victor has. Since Victor has 2 times the number of trophies as Dean we can do...

2 · 9 = 18

Therefore, Victor has 18 trophies!

Hope this helps :)

Answer:

Vitor has 18 trophies and Dean has 9.

Step-by-step explanation:

The sale price of an item is $330 after a 25% discount. What was the original price of the item?

Answers

Answer:

$440

Step-by-step explanation:

100%-25%=75%

75%=330

1%=330÷75=4.4

100%=100x4.4=440

Hope this helps! Thanks.

1) (2.01) Identify domain and range. Then determine whether the relation is a function or not. Explain your reasoning.

x y
2 2
-1 4
0 6
3 2

Is this relation a function? Why or why not?

Answers

Domain {-1,0,2,3} Range {2,4,6}


Function because every domain has one set of range.

1. Jean bought the new Iphone for $1080 (Tax included) on an installment plan. The installment
agreement included a 10% down payment and 24 monthly payments of $50 each.
a. How much is the down payment?
b.what’s the total amount of the monthly payments?
c.how much did Jean pay for the phone on the installment plan?
d.what is the finance charge (interest)?

Answers

Answer:

jndfjhasbfjashdfbasjdfbjashbdcjashdbjcbjhasdcbjasdcbjashdcbjashcdbjadhcbasdhcb

Step-by-step explanation:

Tell me pls but pls no files

Answers

Answer: C

Step-by-step explanation:  When you rotate it 90 degrees it is the same then you put it 3 to the right which makes it opposite. I mean I am pretty Sure.

Hello! I'm in the 7th grade and I'm having trouble with math this year... Will someone please help me with this? :)

(the question is down below)

Answers

Answer: 66

Step-by-step explanation: 30 x 2 = 60... 30 / 5 = 6... 60 + 6 = 66 :D

i'm in seventh too hehe

The number of words Latisha can text, y,
varies directly with x, the number of
minutes spent texting. If Latisha texted 180
words in 5 minutes, find k, the constant of
proportionality.

Answers

Answer for A it’s 24

What is the range?can someone please help I forgot to study

Answers

Answer

The range is the difference between the largest and smallest numbers.

Step-by-step explanation:

The range is the difference between the largest and smallest numbers.

Evaluate.

3⋅2^3+5^2−18÷6




25

31

40

46

Answers

[tex]▪▪▪▪▪▪▪▪▪▪▪▪▪  {\huge\mathfrak{Answer}}▪▪▪▪▪▪▪▪▪▪▪▪▪▪[/tex]

Let's evaluate :

[tex]3(2) {}^{ 3} + {5}^{2} - (18 \div 6)[/tex]

[tex](3 \times 8) + (25) - (3)[/tex]

[tex]24 + 25 - 3[/tex]

[tex]49 - 3[/tex]

[tex]46[/tex]

Answer:

[tex]46[/tex]

Step-by-step explanation:

Hey there,

Before solving the sum you have to know about the BODMAS theorem.

That means you have to solve this sum according to the BODMAS theory.

BODMAS theory is,

B - Brackets

O - Of

D - Division

M - Multiplication

A - Addition

S - Subtraction

Let us solve the sum now.

[tex]3 \times {2}^{3} + {5}^{2} - 18 \div 6 \\ 3 \times 8 + 25 - 18 \div 6 \\ 24 + 25 - 3 \\ 49 - 3 \\ = 46[/tex]

Hope this helps you.

Let me know if you have any other questions :-):-)

A submarine dives 51 3/5 meters below the surface of the water in 4 minutes. how many meters does the submarine dive each minute? NO LINKS!
A: 12 9/10
B: 12 3/4
C: 206 2/5
D: 47 3/5

Answers

Answer:

a

Step-by-step explanation:

51 3/5 = 258/5

258/5 / 4 = 12.9 (meters the submarine dives each min)

now we have to find out what 12.9 is as a fraction!

12.9= 12 9/10 because .9 is equal to 9/10, and 12. equals 12!

X(x-9)(x+4)/6x^3( x+4)(x-9) simplified

Answers

Answer: 1/6x^2

Step-by-step explanation: Cancel out like terms like (x-9) and (x+4), then x.

Shelly bought a bed sheet for $1699.
She gave the Shopkeeper $2000 - what
amount will be returned
by
the shopkeeper?

Answers

Answer:

the shop keeper will return $301.00

The shop keeper will return $301.00

(IMAGE IS ATTACHED. PLEASE HELP! GIVING 100 POINTS)
What is the value of x?


Enter your answer in the box.

Answers

Answer:

x = 50

Step-by-step explanation:

→ Make the equations equal to each other

2 ( x + 10 ) = 3x - 30

→ Expand brackets

2x + 20 = 3x - 30

→ Minus 3x from both sides

-x + 20 = -30

→ Minus 20 from both sides

-x = -50

Opposite angles are equal

[tex]\\ \sf\longmapsto 2(x+10)=3x-30[/tex]

[tex]\\ \sf\longmapsto 2x+20=3x-30[/tex]

[tex]\\ \sf\longmapsto 3x-2x=30+20[/tex]

[tex]\\ \sf\longmapsto x=50[/tex]

what is the percent of 3/8

Answers

Answer: 37.5%

Step-by-step explanation: To convert the fraction to decimal first convert to decimal and then multiply by 100. Therefore, the solution is 37.5%.

Answer:

37.5%

Step-by-step explanation:

Sam bowled three games with scores of 210, 185, and 190. He needs to have a four-game average of 205 to qualify for an elite bowling league. What score does he have to bowl on the fourth game to have the average of 205 that he needs?

Answers

Answer: 235

Step-by-step explanation:

Total score if he average 205 = 205 * 4 = 820

Score needed on 4th game = 820 - 210 -185 - 190 = 235

What is another name for the cell membrane? Generally speaking, identify the overall structure of the cell membrane.

Answers

Another name for the cell membrane,is plasma membrane.

Please help!
I have 10 mins
-I’ll mark BRAINLIEST

Answers

Answer:

The terms are 1/2s, -4, 3/4s, 1/8, and s^3

The like terms are 1/2s and 3/4s

-4 and 1/8 could also technically be counted as like terms but I don't think they're looking for that

Step-by-step explanation:

a like term is a term that has the same variable value associated with the coefficient

The table shows the time Merrida spent driving and the number of miles she drove. She drove the same number of miles each hour.

Merrida’s Driving Time and Distance
Miles
Hours
140
4
175
5
210
6

How many miles did she travel each hour?

Answers

Answer:

20

Step-by-step explanation:

Answer:

To be honest i think that the answer is 23!!

Step-by-step explanation:

whats 76x168 + 69+87=

Answers

Answer:

12,924

Step-by-step explanation:

76x168= 12,768

and...

69+87= 156

now we add them together...

12,768+156= 12,924

Hope this helped you- have a good day bro cya)

What is the solution to the following system of
equations?
-2x + 8y = - 14
- 4x + y = - 13

Answers

Step:just like this
Y-1
X3
Hahahaha hahaha hahaha wheushw whe

1. If the measures of two angles of a triangle are 19° and 80°, find the measure of the third angle.​

Answers

19+80=180

99=180

180_99

81

How tall is House B?

Answers

Answer:

25 maybe I don't now ok because is house a is 24 maybe house b will be 25

gardener has 27 pansies and 36 daisies. He plants an equal number of each
type of flower in each row. What is the greatest possible number of pansies in
each row? Thanks

Answers

Answer:

9

Step-by-step explanation:

the gcf is 9

HELPPPP!!!!! PLEASEEE IM BEING TIMED !!!!!!!!!!!

Answers

Answer:

[tex]x=89[/tex]

Step-by-step explanation:

We can plug into the formula for the mean to get [tex](87+73+84+82+x)/5=83[/tex].

We can combine like terms on the left side to get [tex](326+x)/5=83[/tex].

We can multiply by [tex]5[/tex] on both sides to get [tex]326+x=415[/tex].

We can finally subtract [tex]326[/tex] from both sides to get [tex]x=89[/tex].

So, the answer is [tex]\boxed{x=89}[/tex] and we're done!

[tex]\sqrt{1.69}[/tex]

Answers

1.3 Is that the answer you looking for

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A financially stable person is able to:A. spend money without having to save.B. use loans to cover his or her living costs.C. default on loan payments.D. save money. I NEED HELP. What is the answer? help me out with this question please :) Based on the information in the section entitled "Additional Features," which of these things can the Mini-Jukebox do? A) allow users to buy new music from the device B) show users what the cover of the CD looks like C) let users know if someone is trying to call them D) give users recommendations for music they will like how do scout and dill react to toms treatment by the prosecutor A game at a carnival has 4 colors on a wheel, as seen in the diagram. Each section of the wheel is the same size. hellllllllllllllllllllllllllllpppppppppppppppppppppppppppp me Someone please help fast 9 3b can someone help me out please? an is a strong visual learner. In his violin performance class, Ian is required to take a test that involves playing two songs from memory. Which strategy would most likely help Ian prepare for his test Part of the population of 5,500 elk at a wildlife preserve is infected with a parasite. A random sample of 50 elk shows that 6 of them are infected. How many elk are likely to be infected? Based on the sample, there will likely be infected elk in the wildlife preserve. PLEASE HELP I CANT MISS ANY MORE QUESTIONS Andrea has a bag of marbles. Without looking in the bag,she selects a marble, records its color, and puts it back inthe bag. All marbles are equally likely to be chosen. Sheperforms the process 50 times. In the 50 trials, she recordsthe following colors of marbles from the bag.Number of times a purple marble was chosen 24Number of times a pink marble was chosen 11Number of times a yellow marble was chosen 15Based on the data Andrea collected, what is the estimated probability, insimplest form, of choosing a purple marble from the bag?A. 50/24B. 48/50C. 12/100D. 12/25 ANSWER ASAP PLS The circular opening of a tunnel has a circumference of 36 meters. Which equation can be used to find d, thediameter of the tunnel opening in meters? Convert: 5 mi= ________ ydGroup of answer choices1,7608,8008,0007,040The ___________________ of an object is how heavy the object isGroup of answer choicesnonelengthweightcapacityThe _____________________ of a container is the amount the container can hold.Group of answer choiceslengthcapacityNo answer text provided.weightA standard coffee mug has a capacity of 16 fluid ounces. If Annie needs to fill 26 mugs with coffee, how many total quarts of coffee does she need?____________________________________________________________________________________________________________________Convert: 9 T = _____________ lb =Compare. Write or = Solve.96 fl oz ___________ 13 cCompare. Write or = Solve.25 lb ______________ 384 ozCompare. Write or = Solve.8 yd ______________ 288 in.Convert. 336 oz = _________ lb = Graph the function f(x)= -2.5x^2 A phone company charges a sign-up fee of $3.50, plus $x for every hour the phone isused. If Brian talked on the phone for 12 hours and paid a total of $75.50, which of thefollowing equations can be used to find, x, the hourly rate of the phone plan? 11. All of the following have contributed to an increase in presidential power in thepost-1945 era EXCEPT *A. tensions between the United States and the Soviet Union during the Cold WarperiodB. an increase in public expectations for services from the federal governmentC. economic and domestic problems such as inflation, unemployment, and civil rightsissuesD. increasing United States involvement in international affairsE. legislation granting the President the power to impound funds appropriated byCongress porque estoy tan gordo pa Is this true or false ? Helppp please helppppp