# Posts by iris

Total # Posts: 245

science
A weight of 500kg is suspended by two chains 1.5m and 2.7mrespectively.the chains are attached to a beam that is 3.746m in length. The distance from the suspension to the ground being 900m. A.Calculate the load. B.the vertical and horizontal reactions at the suspension points.

chem 11
Chloroform, CHCl3, has a boiling point of 62 oC, whereas methane, CH4, has a much lower boiling point of -164 oC. Using diagrams, explain the difference between the two boiling points.

Pre-Calculus
The cost of sending a package overnight is \$14.40 for the first pound and \$3.90 for each additional pound or portion of a pound. A plastic mailing bag can hold up to 3 pounds. The cost f(x) of sending a package in a plastic mailing bag is given by the following function, where...

Pre-Calculus
Which of the following shows the correct notation for “The limit of x^2 - 1 as x approaches 3. A. lim x^2-1 x->3 B. lim3 x->x^2-1 C. lim(x^2-3) x->x^2-1 D. lim(x^2-1) x->3 Thank you

Pre-Calculus
What is the correct notation for “The limit of x^2 - 1 as x approaches 3? Thank you

Pre-Calculus
How does the expansion of (x + y)n and (x - y)n differ? If you can offer an example that would be very helpful. Thank you

Pre-Calculus
Find P_(k+1) if P_(k)=2^(k-1)/k! (I used _ as a sign for a subscript) A. 2^(k+1)/(k+1)! B. 2^k/(k+1)! C. 2^(k+1)/k!+1 D. 2k/k!+1 Thank you

Pre-Calculus
Which of the following shows the correct first step to prove the following by mathematical induction? 3 + 11 + 19 + 27 + … + (8n - 5) = n(4n - 1) A. 3 + 11 + 19 + 27 + … + (8 • 1 - 5) = 1(4 • 1 - 1) B. 8 • 1 - 5 = 1(4 • 1 - 1) C. 3 + 11 + 19 + 27...

Pre-Calculus
Find P + 1 if Pk = 7 + 13 + 19 + ...+[6(k - 1)+1] + (6k + 1) (the k+1 and k in front of the P are subscripts) A. 7 + 13 + 19 + …+[6(k - 1) + 1] + (6k + 1) + [6(k + 1) + 1] B. 8 + 14 + 20 + …+[7(k - 1) + 1] + (7k + 1) C. 7 + 13 + 19 + …+(6k + 1) D. 7 + 13 + 19...

Pre-Calculus
Can someone please explain how eccentricity can be used to classify conics.

Calculus
Use a graphing utility to graph the polar equation shown below. r = cos 5? + n cos ?, 0 ? ? ? ? For the integers n = -5 to n = 5. As you graph these equations, you should see the graph change shape from a heart to a bell. I'm sorry. I'm having issues with graphing this.

English
How is close reading related to annotation? How are they similar?

Pre-Calculus
Convert to rectangular: 4=4sec theta A. y=2 B. y=4 C. x=2 D. x=4

Pre-Calculus
Convert to rectangular: theta=(2pi)/3 A. y=-sqrt3 B. y=-sqrt3x C. x=sqrt3 D. x=-sqrt3y

Pre-Calculus
Convert to rectangular: theta=2pi/3

Pre-Calculus
Which are examples of the use of parametric equations? A. Position of a person on a ferris wheel. B. Position of a ball after being thrown. C. A and B D. Neither A nor B

Pre-Calculus
Which is the best example of the use of parametric equations? A. Measuring weight on the moon. B. Finding the position of a person in a city. C. Determining the position of a satellite during a specific time of day. D. Finding the right parameters to use for a construction ...

Pre-Calculus
Can you please give and example of a hyperbola and ellipse with the same vertices and center that I can graph? Then explain the similarities and differences between the graphs.

Pre-Calculus
given: ((x-2)^2/9)+((y-4^2/16)=1 what is the major axis?

Texas History

Texas History
Why did Santa Anna attack the Alamo? A. It had a supply of gold. B. It was an important strategic location. C. It was his family’s ancient homeland. D. It would ensure a glorious victory.

Calculus
Which of the following would be the best first step when solving the following system using the substitution method? x - y = -4 ; x + 2y = 5 a. x = -4 - y b. x = -4 + y c. 2y = 5 - x d. 2y = 5 + x

Trig
find the angle between u=7i+2j and v=-4j

Calculus
Given: u <-1, 7> and v <4, -3> What is the measure of the angle between them?

Pre-Calculus
Given: u <-1, 7> and v <4, -3> Find: (u • v)(u + v)

Calculus
Find the dot product of: <-1, 7> and <2, ¾>.

Calculus
What is the unit vector of v: <-6, -8>?

Calculus
Given the vectors u = <−3, 7> and v = <5,1>, find 3u + 2v.

Trig
Given tan(A) = 2 and A is in Quadrant I, find cos(2A). A. 0 B. 1 C. 1/2 D. -3/5

Trig
Just confused. Given tan(A) = 2 and A is in Quadrant I, find sin(2A). A. 0 B. 1 C. 1/2 D. 4/5

Pre-Calculus
Given Tan(A) = 5 in Quadrant III and Sin(B) = ⅔ in Quadrant II, find Cos(A-B).

Pre-Calculus
Given Sin(A) = ⅗ and Cos(B) = 8/17 in Quadrant I, find Sin(A+B).

Pre-Calculus
A.Verify the identity. B.Determine if the identity is true for the given value of x. Explain. [cot(x) – 1] / [cot(x) + 1] = [1 – tan(x)] / [1 + tan(x)], x = π/4 I solved A and I believe it's true; however, I need help with B.

Pre-Calculus
A.Verify the identity. B.Determine if the identity is true for the given value of x. Explain. Sec(x) / tan(x) = tan(x) / [tan(x) – cos(x)],x = π I already solved A and I believe it's true; however, I need help with B.

Pre-Calculus
This question has me stuck. Use the Pythagorean identity sin^2 Θ + cos^2 Θ = 1 to derive the other Pythagorean identities, 1 + tan^2 Θ = sec^2 Θ and 1 + cot^2 Θ = csc^2 Θ. Discuss how to remember these identities and other fundamental identities.

History! Help!
Yea! A. It created large populations

History! Help!
The Caddo were an American Indian group in Texas that practiced agriculture and build permanent houses. What can be inferred about the group? A. It created a large population B.It formed a small and defenseless population C.It had no contact with other groups D.It was nomadic ...

History! Help!
The Atakapans occupied the region from the Sabine river to the A. San Jacinto river B. Red river C. Colorado river D. Trinity river Both the Karankawa and Atakapans relied heavily on which resources? A.rival groups B.fish and shellfish C.settlers D.trees and nuts Both the ...

History! Help!
Is that right?

History! Help!
Well.... it would be A?

History! Help!
Which of the following lists the start of the agricultural revolution according to absolute chronology? A. AD 500 B. after hunting and gathering C. post-Spanish exploration D. 5000 BC

Pre-Calculus
Which of the following statements best describes the domain of the functions sine and arcsin? A)Sine domain is all real numbers; Arcsin domain is all real numbers. B)Sine domain is restricted; Arcsin domain is all real numbers. C)Sine domain is all real numbers; Arcsin domain ...

Pre-Calculus
Use a graphing utility to graph the function y = d + a sin (bx - c) for different values of a, b, c, and d. Write a paragraph describing the changes in the graph corresponding to changes in each constant.

Pre-Calculus
You are given the value of tan Θ. is it possible to find the value of sec Θ without finding the measure of Θ? Explain.

Math
125

Math
opps i ment to put 1/2 sometimes it dosent work

Math

Social Studies
The correct answer is B, abolish slavery by ratifying the thirteenth amendment and condemn the act of secession.

health
Trinity is correct, and 16 is B. Thanks Jake and Trinity. :)

science !!
The first one is D and the second one is B. Just took this, got 100%

college algebra2
a triangle whose base is 18 inches long has an area of 280 square inches. find the area of a similar triangle whose base is 6 1/4 feet long.

Science
Yes, the correct answer is definitely B, high altitude.

Social Studies Help
opps 1.A 2.B 3.C 4.A 5.D 6.B

Social Studies Help
1.A 2.B 3.C 4.A 5.A 6.D 7.B

Social Studies Help
The social unit most responsible for teaching the custom and traditions of a culture is? (A) The family (B) The government (C) The army (D) The schools Two important features of a culture are? (A) Weather and writing (B) Language (C) Economy and Climate (D) Natural resources ...

Math
ok

Math
I had chose B but i am not entirely sure

Math
Which number is equivalent to 14/4? A 3.2 , because 14 divided by 4 is 3 with a remainder of 2 B 3.5 because 14 divided by 4 is 3 with a remainder of 2 and 2/4 = 0.5 C 3.3 because 14 divided by 4 is 3 with a remainder of 3 D 3.6 because 14 divided by 4 is 3 with a remainder of...

Science

Health
Thanks all! D False A 100%

Yes, those are the correct answers.

Shalee ^~^
Thanks bruh, you are correct. B C B A 100%

Science
The answers are: 4. A 12. B 15. C 16. B 17. C 19. A Trust me, 100%

Math
Hayden had 2 1/2 gallons of water in his watering can. The seed packet said to use 1/4 of a gallon for peppers and 5/8 of a gallon for tomatoes. Hayden then used some of the water for lettuce. If Hayden had 3/4 gallons of water left over, about how much water did he use for ...

Science
How can you evaluate scientific claims? NEED HELP!

Science
how can models help in science, why they are important, what and some examples of models.

Math
1/16

Physics
An 83-kg fireman slides down a fire pole. He holds the pole, which exerts 500-N steady resistive force on the fireman. At the bottom he slows to a stop in 0.49 m by bending his knees. Determine the acceleration of the fireman while sliding down the pole.

Art
Do all art paintings have culture in the paintings

Science
that is better Thxs That really helps me

Science
the model at UTPA

Science
Need some help? How is the model of King Tut like other models used by scientists?

LA
what is the difference between internal conflict and external conflict Need help A.S.A.P

welcome

Math
oh ok i get it now

Math
i do not understand if it is 6% then is this explanation how you got 12%. which is it 6% or 12%

Social Studies
ok i will do it on my own good night

Social Studies
ok srry my original question is Why did most major northeastern cities in the United States develop along the coast? and it does have why in the beggining

Social Studies
but i still do not get what reed means he says "The answer to "why" is "yes"

Social Studies
oh yeah

Social Studies
i do not get you reed

Social Studies
is that right

Social Studies
ships

Social Studies
Why did most major northeastern cities in the United States develop along the coast?

Social Studies
iris

Social Studies
i know you all might be mad but i need help again here is the question What region of the United States did the first settlers arrive

language arts
i agree it is awesome but the ending i was just made

Social Studies
oh ok i get it

Social Studies
now is that right reed

Social Studies
that the expansion of the US throughout the American continents

Social Studies
is that right reed

Social Studies
the belief or doctrine, held chiefly in the middle and latter part of the 19th century

Social Studies
opps srry wrong name United States that American settlers were destined

Social Studies
the belief or doctrine

Social Studies
well this is what i got the americans traveled to the west and settled does that sound right

Social Studies
oh well that was not me

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