Friday
September 4, 2015

Posts by Alexa


Total # Posts: 286

Math
Suppose x is an angle in the second quadrant such that cosx=-8/17, what is the value of tan(3x/2)?
July 31, 2015

Math
Please help with math question below: Express the triple angle formula of tangent (i.e. tan〖(3x)〗) in terms of tanx.
July 31, 2015

Math
Can you explain more Sunny?
July 31, 2015

Math
Suppose a function f(x) has domain (-1,1). Find the domains of f((x+1)/(x-1))
July 31, 2015

trig
If sinx=3 cosx, then what is sinx∙cosx?
July 30, 2015

Math
You are given triangle ABC. AB=13,BC=15, and CA=14. Point D is on segment BC and CD=6. Point E is on segment BC such that CE>CD and ∠BAE=∠CAD. What is the length of BE?
July 30, 2015

geometry
I'm sorry, should be geometry (math)
July 30, 2015

Math
How many values of x satisfy the equation: sin⁡x=x^2/(625π^2 )?
July 30, 2015

Math
A pirate is on a hill looking at a building. The building is 400 feet tall. The angle of elevation from the pirate to the building is 4° and the angle of depression from the pirate to the bottom of the building is 2°. What is the shortest distance the pirate will need ...
July 30, 2015

Trig
Write an algebraic expression for the following: sin⁡(arctan⁡〖(x+1)/(x-1)〗 )
July 30, 2015

Trig
Prove the identity: (sin⁡(2x-y)+sin⁡y)/(cos⁡(2x-y)+cos⁡y )=tan⁡x
July 30, 2015

Math
A weight of 150 lbs is placed on a smooth plane inclined at an angle of 24° with the horizontal. What is the required force needed to prevent the weight from sliding down the plane?
July 30, 2015

trig
But still not sure how you come up with this formula (a+b)^2 ?
July 29, 2015

trig
Thanks Steve, but how do you get to this step? (a+b)^2 = a^2+2ab+b^2 = 8+32 = 40
July 29, 2015

trig
The hypotenuse of a right triangle has length 8. The area of the triangle is also 8 units squared. What is the perimeter of the triangle?
July 29, 2015

Calculus
Can you explain how to get these from here: 700 @ N23°E = (273.51,644.35) (333.51,644.35) = 725.55 @ N27.36°E
July 29, 2015

Calculus
An airplane is heading at a bearing of N23°E at a speed of 700 km/hr, but there is a wind blowing from the west at 60 km/hr. If the plane does not make any correction, what will be the bearing of the plane? What is its speed relative to the ground (ground speed = airspeed...
July 29, 2015

sciencce
A dog breeder wanted to produce a small variety of cocker spaniel. He mated the smallest dogs from various litters for many generations. This is an example of
June 1, 2015

Geometry
thank you so much!
May 12, 2015

Geometry
Use the Distance Formula and the x-axis of the coordinate plane. Show why the distance between two points on a number line (the x-axis) is | a – b |, where a and b are the x-coordinates of the points. How would I solve this?
May 12, 2015

geometry
What is the value of x? Justify each step. AC=32 2x 6x+8 .__________________._________________. A B C Drawing not to scale AB + BC = AC a.segment addition postulate 2x + 6x + 8 =32 b.substitution 8x + 8 = 32 c.simplification 8x = 24 d.addition property of equality x = 3 e....
April 27, 2015

geometry
2x 6x + 8 .__________.__________. A B C this is a more accurate scale drawing
April 27, 2015

geometry
What is the value of x? Justify each step. AC=32 2x 6x+8 .__________________._________________. A B C Drawing not to scale AB + BC = AC a.segment addition postulate 2x + 6x + 8 =32 b.substitution 8x + 8 = 32 c.simplification 8x = 24 d.addition property of equality x = 3 e....
April 27, 2015

geometry
Write the conditional statement that the Venn diagram illustrates. The Venn diagram includes a large circle and it says quadrilateral and a small circle in it that says squares. Would this be the answer: If quadrilaterals are a four sided figure then in is a square?
April 22, 2015

physics
A honeybee with a mass of 0.175 g lands on one end of a popsicle stick (Active Example 9-2). After sitting at rest for a moment, the bee runs toward the other end with a velocity 1.75 cm/s relative to the still water. What is the speed of the 5.00 g stick relative to the water...
April 17, 2015

physics
Two 75.0 kg hockey players skating at 5.60 m/s collide and stick together. If the angle between their initial directions was 115°, what is their velocity after the collision? (Let the motion of player 1 be in the positive x-direction and the motion of player 2 be at an ...
April 17, 2015

physics
To balance a 29.8 kg automobile tire and wheel, a mechanic must place a 58.2 g lead weight 25.0 cm from the center of the wheel. When the wheel is balanced, its center of mass is exactly at the center of the wheel. How far from the center of the wheel was its center of mass ...
April 17, 2015

Geometry
A tire leaves a track of fresh snow. The area of the track is 250 square feet. How many turns does the tire make?
March 19, 2015

English
What is a great way to start a compare and contrast essay about honor? I want to compare Julius Caesar and Abraham Lincoln, the two great honorable men of our history.
February 23, 2015

English
Essay: Honor Introduction/Topic sentence: Courage, strength, and dignity is a very hard goal to achieve and to accomplish in ones life. Many have not succeeded in such a gift in their life but they took it for granted. How can you fix these two sentences or are they correct as...
February 23, 2015

math
Milky uses 192 beads to make a bracelet and a necklace.It takes 5 times as many beads to make a necklace than it does to make a bracelet.How many beads are used to make the necklace 192 divided by 5 is 38 and I got remainder of 2 but I don't know what I did wrong.did I do ...
February 11, 2015

math
Milky uses 192 beads to make a bracelet and a necklace.It takes 5 times as many beads to make a necklace than it does to make a bracelet.How many beads are used to make the necklace
February 11, 2015

linear algebra
Your cheating isn't helping you Hannah, I hope you know that this will be seen by the school, and there will be major punishment, and webmails going to your mother. I hope you don't mind that!
February 3, 2015

math
A tile is the basic unit that makes an entire floor pattern what fraction is white W ? Green G ? Yellow Y ? brown B ? BB B B B B G G B B Y Y Y Y B B W W W W W W B W W W W W W G G Y Y Y Y B B B B
February 2, 2015

math
A tile is the basic unit that makes an entire floor pattern what fraction is white? Green? Yellow? brown?
February 2, 2015

Math
if x erasers have a weight of 80 grams, what is the total weight of 50 erasers?
January 12, 2015

Chemistry
The homework question is : Calculate the Delta H for the following reaction: C6H6 + O2 -> C + H2O(l) State whether the reaction is exothermic or endothermic. I'm not sure where to go with this but so far I balanced out the formula to this C6H6 + (3/2)O2 -> 6C2 + 3H2O...
December 1, 2014

Literature
Which of the following passages from “The Garden of Stubborn Cats” is a clue that the cats symbolize resistance to order? A. “Following his tabby friend, Marcovaldo had started looking at places as if through the round eyes of a cat ….” B. “On the...
October 8, 2014

Literature
thank u!
October 8, 2014

Literature
The chaperone allowed it, so Sarita and Pepe _____ to dance. A. begun B. began C. beginned D. will have begun A or B which A sounds better?
October 8, 2014

Literature
Which of the following sentences contains an action verb? A. Pahom's wife seems jealous of her sister. B. The Devil is happy about Pahom's boast. C. The grain dealer mentions the Bashkirs. D. Pahom becomes greedy for more land. I think its D??
October 8, 2014

Literature
Which of these statements includes details about setting? A. A new student in school wants desperately to make friends. B. You can get satisfaction from trying, even if you do not succeed. C. The Great Depression had put half of the town out of work. D. Nobody has seen the ...
October 8, 2014

Chemistry
A gas mixture composed of helium and argon has a density of 0.846g/L at a 734mmHg and 298 K. What is the composition of the mixture by volume?
October 8, 2014

Chemistry
A 0.700 g sample containing Ag2O and inert material is heated, causing the silver oxide to decompose according to the following equation: 2 Ag2O(s) → 4 Ag(s) + O2(g) If 13.8 mL of gas are collected over water at 27°C and 1.00 atm external pressure, what is the ...
October 8, 2014

physics
A soccer ball is kicked from the ground with an initial speed of 19.4 m/s at an upward angle of 49.8˚. A player 48.5 m away in the direction of the kick starts running to meet the ball at that instant. What must be his average speed if he is to meet the ball just before ...
October 2, 2014

Precalc
A taxi company charges $4.00 for the first mile (or part of a mile) and 40 cents for each succeeding tenth of a mile (or part). Express the cost C (in dollars) of a ride as a piecewise-defined function of the distance x traveled (in miles) for 0 < x ≤ 2.
September 7, 2014

Chemistry
Which of the following results from the presence of a solute in a given solvent? A. The vapor pressure of the solution is lower than that of the pure solvent. B. The boiling point of the solution is lower than that of the pure solvent. C. The freezing point of the solution is ...
May 22, 2014

Chemistry
that makes sense thank u!
May 22, 2014

Chemistry
If the solubility of a gas in water is 1.22 g/L at 2.75 atm, what is its solubility (in g/L) at 1.0 atm? A. 0.44 g/L B. 3.97 g/L C. 2.25 g/L D. 3.36 g/L I think the answer is C.. i did 2.75 x 1.0 = 2.75 / 1.22 = 2.25 but people say the answer is A... why? i think the answer is...
May 22, 2014

Chemistry
A sample of H2 is collected over water such that the combined hydrogen–water vapor sample is held at a pressure of 1 standard atmosphere. What is the partial pressure of the H2 if that of the water vapor is 2.5 kPa? A. 103.8 kPa B. 98.8 kPa C. 2.5 kPa D. 101.3 kPa B or C???
May 21, 2014

Chemistry
Calculate the molarity of 17.g of NaCl in 881 ml of solution
April 13, 2014

chemistry
Sodium sulfate is slowly added to a solution containing 0.0500 M Ca2 (aq) and 0.0210 M Ag (aq). What will be the concentration of Ca2 (aq) when Ag2SO4(s) begins to precipitate? Ksp=1.20×10^–5 silver sulfate ksp=4.93x 10 ^-5 calcium sulfate
April 10, 2014

statistics
A.) .55067 B.) .30119 C.).3297
April 9, 2014

Math!!!!
thanks!!! i will ask some more later(:
March 26, 2014

Math!!!!
y-(-3)= -1/2(x-(0)) How do you solve this equation and graph?????
March 26, 2014

Math
The names, or notes, of all the white keys on a piano are written on pieces of paper and placed in a cup. There are 7 sets of the notes D, E, F, and G and 8 sets of the notes A, B,and C. If a person draws one note out of the cup without looking, what are his or her chances of ...
March 20, 2014

chemistry
if you had 0.028 moles of copper sulfide, how many grams would you have?
March 20, 2014

Multiple Choice HELP!
What is a counterexample for the conjecture? Conjecture: The product of two positive numbers is greater than the sum of the two numbers. A. 3 and 5 B. 2 and 2 C. A counterexample exists, but it is not shown above. D. There is no counterexample. The conjecture is true. I think ...
March 20, 2014

Science URGENT
Hi, I am working on stoichiometry and limiting reactant problems. I have worked through examples in my book and I did them right and can solve for the excess, however there is one problem in the book that has confused me. I don't understand why they identified the limiting...
March 12, 2014

Science--Please Help!
Someone please explain this to me. I thought the smaller number is the limiting reactant but it appears its not the case here.
March 12, 2014

Science
Hi, I am working on stoichiometry and limiting reactant problems. I have worked through examples in my book and I did them right and can solve for the excess, however there is one problem in the book that has confused me. I don't understand why they identified the limiting...
March 12, 2014

History Help!
What were the key aspects of Lyndon B. Johnson’s Great Society? *Can you please send me a link to find this information! thank you!!
March 12, 2014

History Multiple Choice
Why did slavery continue after the Revolution? A. Slave labor was important to the New England economy. B. The colonial government encouraged manumission. C. British, Loyalists, and Patriots all agreed that liberty did not extend to slaves. D. The Southern plantation economy ...
February 11, 2014

History Multiple Choice
One of the Patriots’ greatest strengths was their A. reliance on local militia. B. well-trained soldiers. C. superior troop numbers. D. persistence in fighting. Is ir B?????????
February 11, 2014

Government
Journalist Walter Lippmann suggested that Question 18 options: 1) polling, even when done scientifically, cannot be trusted because it is in people’s nature to be dishonest in response to political questions. 2) the dominance of polling has brought about an ideological ...
October 6, 2013

Chemistry
What is the absolute entropy of 1.9 mol of gaseous ammonia at 2.8 bar and 298 K?
October 5, 2013

Accounting
The following data relate to direct labor costs for the current period: standard cost36000hours $22 actual cost 35000hours $23 What is the direct labor time variance?
July 23, 2013

math
Wrong
March 14, 2013

Pre-Algebra
NEVER MIND 0-0
March 13, 2013

Pre-Algebra
*CRY* *CRY*
March 13, 2013

Pre-Algebra
MS.SUE MS.SUE?????!!!!???!!
March 13, 2013

Pre-Algebra
Hello ???????????
March 13, 2013

Pre-Algebra
Ms. Sue ?
March 13, 2013

Pre-Algebra
5) b 2) a 3) d
March 13, 2013

Pre-Algebra
Please help Please help please help me with my homework !!!!!! :( :( :( :( *sad*
March 13, 2013

Pre-Algebra
1) Find the surface area for a sphere with a radius of 10 feet. Round to the nearest whole number. a. 1,256 ft2 b. 4,189 ft2 c. 1,089 ft2 d. 1,568 ft2 2) Find the volume of a sphere with a radius of 10 feet. Round to the nearest whole number. a. 1,257 ft3 b. 4,187 ft3 c. 1,089...
March 13, 2013

Statistics
Suppose. Population of test-scores is normally distributed with mean 65 and standard deviation 13 x~n (65,13) if you select a test at randome what is the probability that the score is below 60 or that it is between 65 and 70 please show work!
March 10, 2013

Geometry
1) If m1 = 37°, what is the measure of 4? a. 53° b. 43° c. 37° d. 27° 2) If m1 = 40°, what is the measure of 5? a. 50° b. 40° c. 35° d. 25° 3) If m4 = 105°, then what is the m8? a. 105° b. 75° c. 175° d. 25° My Answer...
February 27, 2013

math pls help Ms Sue
its right
December 3, 2012

Physics
A 50 kg skater at rest on a frictionless rink throws a 2 kg ball, giving the ball a velocity of 10 m/s. Which statement describes the skaters subsequent motion? Explain please. a. 0.4 m/s in the same direction as the ball. b. 0.4 m/s in the opposite direction of the ball. c. 2...
December 2, 2012

math
Triangle ABC has coordinates A(1, 4); B(3, –2); and C(4, 2). Find the coordinates of the image A'B'C' after a reflection over the x-axis
November 30, 2012

Science
Connective tissue wraps around to protect the organs, store nutrients, attach muscles and bones, are found in deep layers of skin to give it strength. On the other hand, nerve tissue conduct impulses to and from organs via neurons. They are mainly found in the spinal cord, ...
November 15, 2012

physics
a) Gravitational potential energy = mgh = (106kg)(10m/2^2)(1.96106m) = 2078.7236 J b) F = ma = (10kg)(10 m/s^2) = 100 N
November 14, 2012

math
n!/r!(n-r)! 8!/4!(8-4)! = 70
November 14, 2012

Math
The equation would be 2x + 3.50 = 30.50. Basically, x represents the shirts and since there are two shirts, we multiply x by 2. $3.50 is added because one shirt is $3.50 more than another. Isolate the variable. Subtract 3.50 from 30.50 which would equal 27. Then, divide 2 from...
November 14, 2012

Physics
Block A of mass 2.0 kg and Block B of 8.0 kg are connected by a spring of spring constant 80 N/m and negligible mass. The system is being pulled to the right across a horizontal frictionless surface by a horizontal force of 4.0 N, with both blocks experiencing equal constant ...
November 14, 2012

math
37 and 5
November 14, 2012

Physics
Use Poiseuille's Law, and sub rho*g*h for (P2-P1)
November 14, 2012

Physics
Water (η = 1.00E-3 Pa*s) is flowing through a horizontal pipe with a volume flow rate of 0.0120 m3/s. As the figure below shows, there are two vertical tubes that project from the pipe. Assume that H = 0.0421 m and L = 0.706 m. Calculate the radius of the horizontal pipe.
November 14, 2012

Spanish Beg. 1 - help (anyone???)
Most nouns ending -o and -os are masculine.Most nouns ending in -a and -as are feminin.
November 13, 2012

Chemistry
Calculate the volume of oxygen you would need, at 1.00 atm and 298 K, to completely oxidize 51g of glucose.
October 31, 2012

chemistry
1. How many grams of NaCl are present in 15 mL of a 2.0% solution?
October 19, 2012

algebra 2
Samantha needs to solve the equation x2 - 12x = 40. What must she do to each side of the equation to complete the square?
October 8, 2012

algebra 2
Samantha needs to solve the equation x2 - 12x = 40. What must she do to each side of the equation to complete the square?
October 8, 2012

Biology
to grow larger, arthropods must A grow a new endoskeleton. B grow a new exoskeleton. C add to the old endoskeleton. D add to the old exoskeleton. is it B?
June 14, 2012

Biology
Growth by cell division that makes both ends of a plant longer but not wider is called A secondary growth. B annual ring growth. C vascular growth. D primary growth. is it D? thanks
June 13, 2012

Geography
Growth by cell division that makes both ends of a plant longer but not wider is called A secondary growth. B annual ring growth. C vascular growth. D primary growth. is it D? thanks
June 12, 2012

Physics
Volume of 1200 L of helium at 4000 Pa is heated from 45.0°C to 75.0°C increasing the pressure to 6000 Pa. What is the resulting volume of gas?
April 11, 2012

Math
determine whether the ordered pair is a solution; 6y-3x=-9,(1,-1) and 5y-2x=15 Also 2x+5y=-15
April 4, 2012

Geometry
4. Plots of land between two roads are laid out according to the boundaries shown. The boundaries between the two roads are parallel. What is the length of Plot 3 along Cheshire Road? 46 yards 67 yards 66 yards 37 yards
February 27, 2012

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