# Posts by Heather

Total # Posts: 1,110

**Math**

Hi! I wanted to know how you would sketch the graph of this system of inequalities. Math problem: 2x2 + y ≥ 2 x ≤ 2 y ≤ 1

**Math Check**

Hi! Can someone check my answers? Thanks! Directions: Solve each system by using the elimination method. Make sure to write your answer in (x,y) form. 1.) 3x-5y=2 2x+5y=13 2.) 3x+11y=4 -2x-5y=9 My answers: 1.) (3,7/5) 2.) (-17,5)

**Chemistry**

A 45.4 grams of a gold metal sample was heated with the amount of energy of 228 J. Which of the following would the most plausible temperature change of the gold sample? The specific heat of gold is 0.131 J/g.oC. 12.8 oC to 38.3 oC 24.4 oC to 81.6 oC 23.8 oC to 62.1 oC 38.3 oC...

**Math**

Look for the angle (θ) between the vectors. Remember to round your answer to the nearest tenth. a.) u=<3,2> v= <4,0> b.) u = 2i - 3j v = i - 2j

**Math**

Hi! So I asked about this question earlier and I've been trying to solve it with the directions I was given by someone before, but, I'm still confused and keep getting weird numbers. Can someone help me with this? Directions: Find the angle, θ, between the vectors...

**Math**

Hi! Can someone help me with these? Thanks a bunch! :) 1.) Find the dot product. <0, 3> ∙ <4, -2> 2.) Find the dot product of u and v. u = <-4, 1> v = <2, -3>

**Math**

Hi! Can someone help me with these? Thanks a bunch! :) 1.) Find the dot product. <0, 3> ∙ <4, -2> 2.) Find the dot product of u and v. u = <-4, 1> v = <2, -3>

**Icp**

23.5 N

**physics**

A football is kicked at ground level with a speed of 17.9m/s at an angle of 36.0∘ to the horizontal. How much later does it hit the ground?

**physics**

A ball thrown horizontally at 13.0m/s from the roof of a building lands 21.4m from the base of the building. How tall is the building?

**Finance**

The Health Corp issued an 12%, 15 yr bond 5 yrs ago. At the time of issue the bond's par value was $1,000. Comparable bonds are yielding 10% today. What must Health Corp's bond sell for in today's market to yield 20% (YTM) to the buyer? Assume bond pays interest ...

**Math**

Find the product 8 1/3 x 3/5 in simplest form Find the product 5 1/2 x 3 1/3 in simplest form Use distributive property to find the product 4 2/5 x 10

**Precalc/Trig**

I don't understand how to do these problems: Find two pairs of polar coordinates for each point with the given rectangular coordinates if 0 ≤ θ ≤ 2π. Round to the nearest hundredth, if necessary. 17. (2, -3) Answers: (3.61, 5.30) and (-3.61, 2.16) 19...

**geometry**

Talisha's bedroom is a rectangular prism. The area of the floor is 156 square feet, and the height of the bedroom is 9 feet. What is the volume of talisha's bedroom

**Precalc/Trig**

Sorry, I mistyped the question. The 2 roads intersected at 120 degrees. I got 747.48, is this correct? Sorry and thanks again.

**Precalc/Trig**

Thanks! But why wouldn't it be cos120 degrees? Because it's a straight line and 180-60 = 120?

**Precalc/Trig**

2 roads intersect at an angle of 60 degrees. A friend's mail box is 434 feet from that intersection and your mailbox is on the other road and is 525 feet from the intersection. How far is it from your mailbox to your friend's mailbox? I got 1016.66 feet, but that is ...

**philosophy**

Show at least one metaphysical account of reality For example, you might discuss Plato, Aristotle, or the Cartesian method. Make sure that you include an account of reality and truth and discuss how (and/or whether) human beings are capable of knowing reality with any ...

**Precalc/Trig**

I have no idea how to solve this one problem: Round to two decimal places. Two observers 25 feet apart, sight to the top of the tree. If the angle of elevation to the top of the tree from the observer closest to the tree is 30 degrees and the angle of elevation from the ...

**English**

All of the following statements about simple sentences are true except a. a simple sentence consists of a subject and a verb. b.a simple sentence may have two or more subjects. c.a simple sentence may have two or more verbs. d.a simple sentence may contain a coordinating ...

**Precalc/Trig**

Sorry there are quite a few problems, but I just need to know if these are correct (and if they aren't, where I went wrong): 1. Solve these equations. tanθ = -√3 θ = 2π/3 + kπ θ = 5π/3 + kπ 2. secθ = √2 θ = π/4...

**biology**

Various forms of a trait may be more or less ________ under given environmental conditions.

**Math**

14 boys play basketball, 12 boys play soccer, 16 boys play baseball. How many boys play basketball, soccer, or baseball?

**Harmon**

If light travels 10,000km ( 3.3 x 10 to the -2 power) seconds, how will it take to travel one meter. I know 1 meter = 0.001km

**Math**

Estimate 2/3 x 10

**Quantitative Reasoning (math)**

A round silo is 60 ft tall and has a 15 ft radius. About high would a load of 32,000 cubed feet fill the silo to? Do I start with pie*radius squared?

**statistics**

in order to estimate the mean amount of time computer users spend on the internet ea mn, how many people do i interview to have 90% confident sample mean within 11 min of the pop mean? Assum sd= 203 min

**chemistry**

the reaction of 7.10g carbon with excess O2 yields 12.25g of CO2. what is the percent yield of this reaction? I have tried everything and looked through all of my notes and nothing is working for stiochiometry

**Principles of Chemistry**

Use P1V1=P2V2 Since you don't know the P2 just plug in all of the known factors: (3.00L)(1.30atm)= (1.00L)P2 Solve for P2 3.90=1 P2=3.90atm

**Physics**

A glider of length 10.1 cm moves on an air track with constant acceleration. A time interval of 0.732 s elapses between the moment when its front end passes a fixed point circled A along the track and the moment when its back end passes this point. Next, a time interval of 1....

**algebra**

Find the standard form for the equation of a circle (x−h)^2+(y−k)^2=r^2 with a diameter that has endpoints (−8,−10) and (5,−4). Find the h= -1.5 k= -7 r=? I do not understand how to find the radius.

**Quantitative Reasoning (math)**

Your weight on the moon is relative to your weight on Earth. Neil Armstrong weighed 360 lbs. in his moon gear while on Earth, but on the moon he only weighed 60 lbs. What is the ratio of the Earth weight to the moon weight? How much would you weigh (approximately) on the moon?

**Quantitative Reasoning (math)**

One out of every five people who buys ice cream buy vanilla ice cream. If a store sells 125 ice cream cones in one day, about how many will be vanilla? I know how to solve the proportion once I set it up, but I cant figure out how to set it up

**Algebra**

The length of a rectangle is 1 foot less than twice the width, and the area of the rectangle is 21 ft.². Find the dimensions of the rectangle

**Precalculus/Trig**

I can't seem to prove these trig identities and would really appreciate help: 1. cosx + 1/sin^3x = cscx/1 - cosx I changed the 1: cosx/sin^3x + sin^3x/sin^3x = cscx/1-cosx Simplified: cosx + sin^3x/sin^3x = cscx/1-cosx I don't know where to go from there. 2. (sinx + ...

**Precalculus/Trig**

Prove the following identity: 1/tanx + tanx = 1/sinxcosx I can't seem to prove it. This is my work, I must've made a mistake somewhere: Converted 1/tanx: 1/sinx/cosx + sinx/cosx = 1/sinxcosx Simplified 1/sinx/cosx: cosx/sinx + sinx/cosx = 1/sinxcosx Found common ...

**Math**

Sorry- it was 1/3c = 6b^2 + 2. I can see your way of substituting, though!

**Math**

Actually, just did it again and got (D). However, it's an SAT question and I need the fastest way to solve it... what I did was plug in values for a and b (3 and 2, respectively) then find c (78) and plug a (3) back into each of the choices to see if c (78) and the answer ...

**Math**

If 2a = 3b, 1/3c = 6b^2, and b > 0, what is c in terms of a? The answer choices are: (A) 8a^2 + 6 (B) 8a^2 + 12 (C) 12a^2 + 6 (D) 18a^2 + 6 (E) 18a^2 + 12 Thank you!

** SP180.1.2 Principles of Public Speaking**

i need help with my outline. not sure where to go. i am at a complete loss i know i want my topic to be Why banning the use of cell phones while driving should be mandatory nationwide I. TITLE: Why banning the use of cell phones while driving should be mandatory nationwide A. ...

**personal finance**

If Bridgette marrow is a sophomore at state college ad is running out of money. wanting to continue her education, Bridget is considering a student loan. Explain her options. How can she best minimize her borrowing costs and maximize her flexibility?

**algebra 2 and Trigeonomerty**

a bag contains 12blue, 10 green and 6 red and 2 white marbles. a) If you draw 3 marbles without putting them back, what is the probability that all 3 are blue? 12/30 * 9/27 =0.133? b) If you draw 2 marbles without putting them back, what is the probability that neither is blue...

**Economics help please!!!**

In a specific industry, two dominant firms work together to set prices. We call this A. competition. B. collusion. C. market dominance. D. market influence. Answer this Question

**Economics**

Im thinking A. Am i correct?

**Economics**

Unemployment is on the rise though inflation is quite low. Gross Domestic Product is rising but more slowly than the goal rate. The Federal Reserve may buy government securities in open market operations in order to A. increase the money supply and encourage economic growth. B...

**math**

The test scores for a math class are shown below 83,85,82,93,83,84,95,87,86,94 what is the standard deviation of the data set?

**math**

there are 4 blue tile,s 3 yellow tiles, 5 red tiles, and 2 green tiles. he draws a tile replaces it, and draws another tile. what is the probability he will draw a blue tile on both

**math**

In triangle PQR, m<P=53 degrees, PQ=7.4, and PR=9.6. What is m<R to the nearest degree

**Math Question**

Find an equation that models a hyperbolic lens with a=16 inches and foci that are 40 inches apart. Assume that the center of the hyperbola is the origin and the transverse axis is vertical

**Algebra help please!**

Suppose you are researching the eating habits of people your age. What sampling method could you use to find the percent of students in your grade who eat five servings of fruit and vegetables each day? What is an example of a survey question that does not have bias?

**math**

Find the scale factor troy will to build his pool. The width is 625cm. The olympic pool is 50m long and 25m wide. Then find the length using the scale factor of troy pool

**Chemistry**

The final answer I got was NO + 3Cu^2+ + 4OH^- --> NO3- + 3Cu^+ + 2H2O Which was right. Thank you very much for your help.:)

**Chemistry**

So would this be right then NO + 2H2O + 3Cu^2+ + OH^- ---> 3Cu^+ + NO3^- + 4H^+ +OH^-

**Chemistry**

For a particular redox reaction NO is oxidized to NO3^- and Cu^2+ is reduced to Cu^+ . Complete and balance the equation for this reaction in basic solution. We are given this as a guide to start NO + Cu^2+ --> NO3^- + Cu^+ I started with: Cu^2+ + 2e- --> Cu No + 2H2O...

**Geometry**

#19. Given a regular octagon, find the measures of the angles formed by (a) two consecutive radii and (b) a radius and a side of the polygon.

**Geometry**

#7. Find the area of a polygon with the vertices of (-4,5), (-1,5), (4,-3), and (-4,-3).

**physics**

I have no idea that's why I came to this website

**Geometry**

The glide reflection Ry--x degree T <4,1> maps the P to (4,3). Find the coordinates of P. Please help I'm really confused.

**Geometry**

Thank you Steve.

**Geometry**

Given the lengths of the sides of a triangle, identify the triangle as acute, right, or obtuse. 37,12,34 5,12,13 20,21,28

**algebra**

y/4=15/20 how do I solve the proportion? please explain it to me. I have several to do

**ratio**

given the proportion a/b=5/19, what ratio completes the equivalent proportion a/5= / ? a. a/19 b. b/19 c. 5/19 d. 19/b

**chemistry**

If a tank contains 55.2 g of butane, what volume, in liters, of oxygen is needed to burn all the butane at 0.850 atm and 25 degrees Celsius? Need to show work too.

**Chemistry**

1.695*10^-7

**Earth science**

The greenhouse effect is a result of A. consumption of fruits and vegetables that produce a biofuel. B. absorption and radiation of energy in the hydrosphere. C. absorption and radiation of energy in the atmosphere. D. consumption and radiation of energy in the atmosphere. D?

**Earth science**

1. Which of the following is not a natural cause of climatic change? A. Earth's tilt B. Solar activity C. Human activity D. Volcanic activity I think it is C

**Algebra - Functions**

Aaron is a salesman that earns a base salary of $1,200.00 per month and a commission of 5% on the amount of sales he makes. One month Aaron received a paycheck for $1,811.00. Find the amount of his sales for the month.

**math**

in the rhombus angle 1=140. what are angle 2 and angle 3? a. angle 2=140, angle 3=20 b. angle 2=40, angle 3=70 c. angle 2=40, angle 3=20 d. angle 2=140, angle 3=70

**social studies**

The Louisiana economy as were the economies of several other states was based on plantation slavery and there were no more slaves to raise cotton and other crops such as sugar cane. The people of Louisiana lost all of their money during the war so capital was also scarce. And ...

**Math**

What is an equation in slope-intercept form for y(-4,-2) and x (5,1)?

**Math**

Is the line through points P(3,-5) and Q(1,4) parallel to the line through points R(-1,1) and S(3-3)? Explain please.

**chemistry**

What mass of bromine gas will form from the complete reaction of 150 g potassium bromide and 120 g of chlorine

**Math**

Use roster notation to create and write two proper subsets of your original set. 3. Do the following and write your answers in roster notation. •Find the union of the sets. •Find the intersection of the sets. •Find the complement of each of the sets.

**physics**

Milk with a mass of 0.021 kg and a tempera- ture of 13C is added to 0.12 kg of coffee at 94C. What is the final temperature? Assume the specific heat capacities of the two liquids are the same as water, and disregard any energy transfer to the liquids’ ...

**Math**

Steve can run 3.5 miles in 30 minutes. If Steve increases his rate by 1/2 mile per hour, how far will he run in 2 hours?

**American National Gov.**

The American bureaucracy conjures up the following images except cumbersome “red tape.” civil servants who are inefficient, unresponsive, and unhelpful. officials who have amassed power and who act against the rights of citizens. a system that can act quickly in a ...

**American History**

I also choose B

**American National Gov.**

I'm sorry I didn't know how this board worked so I am going back and giving the best answers I can

**American National Gov.**

I think it's D but not 100% sure

**American National Gov.**

For Max Weber, the bureaucracy was the highest form of rationality because bureaucrats would become cogs in the wheel. it was impersonal. it was personal. it was ordered by impartial rules or laws

**American National Government**

Thanks I went back to my text the answer is A

**American National Government**

I believe the answer is A

**American National Government**

Theodore Lowi suggested the remedy for cumbersome bureaucracy was returning to juridical democracy. delegating even more authority. reducing the size of government. throwing money at the problem.

**American National Government**

The 2000 presidential election is an example of where it is possible to win the popular vote but not have a majority vote in the Electoral College. become President by losing both the Iowa Caucus and the New Hampshire Primary. become President without having a recount of ...

**American National Government**

I just read the definitations for these and I think A is the answer plaes let me know if it makes sense

**American National Government**

The tendency of Congress to defer to the President in foreign policy has at times led to an American dictatorship. a plebiscitary presidency. an imperial presidency. active-positive presidents

**EMT basic**

You and your partner are returning a patient from the Emergency Department to the local nursing home in an ambulance. Your partner is attending to the patient and you are driving. You put the radio on your favorite music station and crack the windows to let the crisp winter ...

**Algebra 2 help.**

For the function f(x)=(3-4x)^2, find f^-1. Determine whether f^1 is a function.

**Stuck on this Algebra 2 question!**

what is the solution of the system of equations? 2x+2y+3z=-6 3x+5y+4z=3 2x+3y+4z=-10

**Anyone want to help me?**

Solve the equation or formula for the indicated variable. s=6r^5t for t

**help!!!!**

Combine like terms. What is a simpler form of the expression. -3(-y-2)+5y

**please help me!! with this science!!!!!**

1. B 2. C 3. C 4. C 5. B 100% Quick Check

**Finance**

Now that you have a full time job you are ready to start investing for retirement. Your corporation will match 50 cents of each dollar that you put in your 401K account up to the first $7,000. You have altogether $15,000 that you can afford to save this year. How should you ...

**Politics**

which of the following is part of an issue network addressing education policy? A. And education reporter for ny times B.a lobbyist for the American Federation of Teachers C. The white house cheif od ataff D. The gov of cali The superintendent of the Chicago citu schoold

**math**

6-mile perimeter. The length is 4 times the width.what is the length width

**volcanoes**

what supplies do you need to make a volcanoes lava if you were to make a volcano. What would be the best thing to use to make a volcano?

**Science help,please...**

I am just kidding. What grade stuff is this?

**Science help,please...**

What grade are you in and are you cheating?

**Chemistry**

Sodium vapor lamps are often used in residential street lighting. They give off yellow light with a frequency of about 5.91 × 1014 Hz. What is this wavelength in nm?