1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Ivahew [28]
2 years ago
9

Easy question!!! 1. Which statement is true?

Mathematics
2 answers:
Pepsi [2]2 years ago
8 0
C. all rectangles are quadrilaterals
coldgirl [10]2 years ago
6 0

Answer:

All quadrilaterals are squares. All rectangles are quadrilaterals.

All quadrilaterals are parallelograms.

Step-by-step explanation:

You might be interested in
Which of the following indicates the subtraction property of equality when solving the equation 86 – 2 (9x + 4) = 12x + 18?
Savatey [412]

Answer:

D) x = 2

hope it helps

please mark brainliest

6 0
3 years ago
Set a timer for 20 seconds. Next, get ready to walk! Start the timer and count the number of steps you take in 20 seconds. Now f
Karo-lina-s [1.5K]

Answer:

1. 2.5 steps per second

2. 1.25 steps

Step-by-step explanation:

6 0
3 years ago
Find the equation of the line thatcpasses through (3, 1) and is parallel to y=1-2x.​
Anna11 [10]
Slope of y=1-2x is -2
Using point intercept form:
y-1=-2(x-3)
y-1=-2x+6
y=-2x+7
5 0
2 years ago
An article in Fire Technology investigated two different foam-expanding agents that can be used in the nozzles of firefighting s
UNO [17]

Answer:

Step-by-step explanation:

Hello!

The objective of this experiment is to test if two different foam-expanding agents have the same foam expansion capacity

Sample 1 (aqueous film forming foam)

n₁= 5

X[bar]₁= 4.7

S₁= 0.6

Sample 2 (alcohol-type concentrates )

n₂= 5

X[bar]₂= 6.8

S₂= 0.8

Both variables have a normal distribution and σ₁²= σ₂²= σ²= ?

The statistic to use to make the estimation and the hypothesis test is the t-statistic for independent samples.:

t= \frac{(X[bar]_1 - X[bar]_2) - (mu_1 - mu_2)}{Sa*\sqrt{\frac{1}{n_1} + \frac{1}{n_2 } } }

a) 95% CI

(X[bar]_1 - X[bar]_2) ± t_{n_1 + n_2 - 2}*Sa* \sqrt{\frac{1}{n_1}+\frac{1}{n_2} }

Sa²= \frac{(n_1-1)S_1^2 + (n_2-1)S_2^2}{n_1 + n_2 - 2}= \frac{(5-1)0.36 + (5-1)0.64}{5 + 5 - 2}= 0.5

Sa= 0.707ç

t_{n_1 + n_2 -2: 1 - \alpha /2} = t_{8; 0.975} = 2.306

(4.7-6.9) ± 2.306* (0.707\sqrt{\frac{1}{5}+\frac{1}{5} })

[-4.78; 0.38]

With a 95% confidence level you expect that the interval [-4.78; 0.38] will contain the population mean of the expansion capacity of both agents.

b.

The hypothesis is:

H₀: μ₁ - μ₂= 0

H₁: μ₁ - μ₂≠ 0

α: 0.05

The interval contains the cero, so the decision is to reject the null hypothesis.

<u>Complete question</u>

a. Find a 95% confidence interval on the difference in mean foam expansion of these two agents.

b. Based on the confidence interval, is there evidence to support the claim that there is no difference in mean foam expansion of these two agents?

8 0
3 years ago
Question 9:
Arte-miy333 [17]

Answer:

I think the answer is.. .

Step-by-step explanation:

(b)

7 0
3 years ago
Other questions:
  • Express in simplest radical form.<br> √6+ 5√54
    15·2 answers
  • What is the surface area for this triangular prism?
    14·1 answer
  • Hey can anyone pls help me in this real quick!!!!
    12·1 answer
  • Antonio invests $18,000 at 8% simple interest for 27 years.
    12·1 answer
  • 5. Write an equation for at least one line perpendicular to the line with eachequation.c. 19x
    9·1 answer
  • 12. Using the diagram, what can be said about angles 7 and 12?
    7·2 answers
  • About how many meters is a 40-yard race
    13·1 answer
  • If u nice u will help me!
    9·1 answer
  • Use substitution to solve the system of equations. How many solutions are there?
    6·2 answers
  • PLEASEEEEEEEEEEEEEEEE :(
    14·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!