# Posts by natalie

Total # Posts: 692

**Chemistry**

When 1.578 grams of a hydrocarbon, CxHy, were burned in a combustion analysis apparatus, 4.951 grams of CO2 and 2.027 grams of H2O were produced. In a separate experiment, the molar mass of the compound was found to be 56.11 g/mol. Determine the empirical formula and the ...

**Cal 2**

Find the points of intersection of the graphs of the functions y=4x^2-25 and y=0. -5/2,5/2 Find the area bounded by the curves y=4x^2-25, y=0, x=-1, x=3.5. PS the area is not 54 I already tried.

**Calculus 2**

Find the area bounded by the curves y=sin(4x) and y=0 for x between x=0 and x=3pi/8.

**Calculus II**

Sketch the region enclosed by 2y=5x^(1/2), y=3, 2y+4x=9. Decide whether to integrate with respect to x or y, and then find the area of the region.

**TX HISTORY; HELP ASAP**

or A ? I'm not sure

**TX HISTORY; HELP ASAP**

How did fighting in the civil war change the lives of Texas soldiers ? a) They came to support the cause of secession b) They traveled far from home to participate in bloody battles c) They earned enough money to buy cotton plantations and slaves d) They lost their home and ...

**Chemistry**

How do I find the molar enthalpy H (kJ/mol) for reaction of NH3 + HCl -> NH4Cl at temp 9.8 celsius by using Hess's Law. I do not understand why there are unknown variables and how to use that to find the molar enthalpy. PLEASE HELP. 1/2 N2 + 3/2 H2 + xH2o -> NH3 H= -...

**math**

put a line ovr that number.a line over a number means infinity.

**Math**

Steve is 3 years older than Tim and twice as old as Hannah. Tim is 2 years older than Hannah. How old are Steve,Tim and Hannah?

**Maths,geography nd science**

What are four factors that cause each of the social issues

**Chemistry**

If you add 13.75 mL of 1.35 M HCl to 22.80 mL of 0.955 M Ca(OH)2, will you neutralize all the Ca(OH)2? You must show data to support your answer.

**Chemistry**

If it takes 22.75 mL of 1.75 M H3PO4 to neutralize 14.90 mL of Al(OH)3, what is the molarity of the Al(OH)3?

**Chemistry **

If it takes 15.0 mL of 0.450 M HNO3 to neutralize 22.00 mL Cu(OH)2, what is the molarity of the Cu(OH)2?

**Chemistry **

How many mL of 1.20 M H2SO4 are needed to neutralize 18.75 mL of 0.843 M LiOH?

**math**

16

**Math**

Jamie spenta total of $11.60 on 5dentical pens and a ruler .A rulercost$1.30less than a pen .how much did a pen cost?

**chemistry**

1) A Galvanic cell runs on the following reaction: Co (s) + Cu2+ (aq) ? Co2+ (aq) + Cu (s) Draw a diagram for this Galvanic cell, labeling the electron flow, the anode and cathode, and the positive and negative sides of the Galvanic cell. 2) A Galvanic cell runs on the ...

**math**

vol of wood= 3*20*120=7200cm3 density of wood= M/V=8000/7200=1.111g/cm3 density of water=1030/1000cm3=1.03g/cm3 so no the wood will not float as it has more density then water

**Social Studies *Check Answers***

Thanks, I changed the second answer to B and got them both right. :)

**Social Studies *Check Answers***

Anyone mind checking these 2 quiz answers please? Which statement best explains why nation-states write constitutions? A: Constitutions give citizens unlimited powers. B: Constitutions establish nation-states. C: Constitutions allow governments to elect leaders D: ...

**SS Check Answers**

100% answers are a b d

**SS Help**

Answer are 1.b,2.a,d 3.b

**Math**

On Aug 14th, One of our Partner's ( Compuville ) cash book showed a debit balance of $4,000.00. His bank statement showed a balance of $4,270.00. On comparison the following were found: * check issued amounting to $2,500.00 has not been cashed * The bank rejected checks ...

**math**

Nilsa converted 1/12 to a repaeting decimal and wrote 0.083 as her answer what error did she make

**science**

What happens when a boy and a girl have sex?

**Calculus**

Thank you so much! ^^

**Calculus**

Hi, could you help me with this one please? Evaluate ∫sin(x)cos^2(x)dx by using the substitution u=sinx Ive done this by using u=cosx no problem but can't get this one :( Thank you so much in advance!

**fedreal government**

Which of the following statements about the Articles of Confederation is UNTRUE? a. It was the second official constitution used to govern America b. It was the first official constitution used to govern America c. Power was too decentralized d. It established a loose league ...

**US History**

A?

**Add Math**

the variable point P(x, y) moves so that it is the same distance from the points (1,6) and (3, 2). The equation of the locus of P may be obtained by?

**math**

a room measures 22 feet by 28 feet. They are covering the floor with square tiles that measure 1 foot on a side and cost $0.89 each. How much will they spend on the tile?

**Math**

4x^2(2x^3 – 5x +6)

**Math**

a regular plot of land is designed so that its length is 6 meters more than its width. the diagonal of the land is 10 meters. to the nearest tenth of a meter, what are the dimensions of the land?

**Math asap**

@Anonymous Some of your answers are wrong for example #5, to find the area you need to multiply but you added 4 and 9 twice which is how you find the perimeter. the correct answer for #5 is 80

**Math**

Marissa bought 2 1/4 gallons of orange juice to make punch. How many qts of oj did she buy? Marissa bought 6 fewer pints of soda than oj. How many cups of soda did she buy?

**College Algebra (pt.3)**

I did indeed. Thank you again for helping me out! Have a great night!

**College Algebra (pt.3)**

Alright, this is a bonus question on my homework. I think I did it wrong... How long will it take for an investment of $1000 to grow to $1750 if interest is compounded continuously at a rate of 8%? Round to the nearest tenth. A=Pe^rt $1750=$1083.38 divided ans= 1.62

**College Algebra (pt.2)**

Thank you again for your help! I thought it was seeming a little too easy for me to be doing it correctly.

**College Algebra (pt.2)**

Hey, I would love if someone could please look over my answers. I just learned this yesterday and want to make sure I did my hw correct. Thanks!!! Solve for x. Round answers to four decimal places where appropriate: 6. ln(5x-3)=0 ans= x=3/5 7. log5^x=3 ans= x^3=5 8. log2^32=x ...

**College Algebra**

Steve! Thank you so much! I was way off! I'll be practicing more.

**College Algebra**

Hey, I would love if someone could please look over my answers. I just learned this yesterday and want to make sure I did my hw correct. Thanks!!! Solve for x. Round answers to four decimal places where appropriate: 1. 6^x=6^2x-1 Ans.= x=1 2. 3^x=1/27 Ans.= x=-9 3. e^3x=10 Ans...

**science**

Sure! No problem👻

**science**

True, but I think the answer that makes the most sense is "create a family safety plan". Even though the storm would be over, this could still be helpful. It's always best to consult your family before making independent desicion a that may compromise your safety...

**science**

It's hard to say, because a few of these answers could potentially be correct. It depends on what your teacher has been teaching you during class, but I think that the most logical answer is "create a family safety plan".

**Math**

Two transparencies, both 8.5 inches by 11 inches, were folded and taped to make cylinders. Prove mathematically, that they have the same volumes

**College Algebra/pre-calculus**

The Pointless Pencil Company purchases a new stamping machine for the production line that cost $8000. The equipment will be replaced in 10 years at which time its salvage value is expected to be $1000. Write a linear equation giving the value, y, of the machine during the ...

**Math**

What are 2 ways to arrange 300 chairs so that there are the same number of chairs in each row?

**science ms.sue or mr.reed plz help me**

anonymous is 100% thank you!

**Math**

A farmer wants to construct a pen with 100 feet of fencing. The pen will be divided into two areas as shown below. Find the maximum dimensions of the big pen. All I have so far is that 3x+2y=100. I am not sure how to move forward.

**algebra 1**

does 4x+5y=0 represent a direct variation? if so, find the constant of variation. complete the steps to solve 4x+5y=0 for y.

**physics**

What potential difference is required to reduce the initial speed of the proton by a factor of 2? A proton has an initial speed of 3.1×105 m/s .

**Math**

Sarah made a square tablecloth and wants to put lace around the edges. The length of one side of the tablecloth is 56 inches. How much lace will Sarah need?

**ONE math question! Check please, thank you!**

Correct!!

**algebra 1**

a bout travels 280 miles downstream and back. The trip downstream took seven hours. The trip back took 14 hours. The speed of the boat in still water and the speed of the current

**science help**

I think "c" is the best answer :)

**Physics**

google search the first part of the equations i have it up with the picture

**Physics**

A woman holds a 1.90-m-long uniform 5.0-kg pole as shown in (Figure 1) ( its horizontal). A. Determine the force she must exert on the pole at A. Express your answer to two significant figures and include the appropriate units. Enter positive value if the force is upward and ...

**English**

Its not d

**English**

Thank you

**English**

In the sentence "There comes a time when the cup of endurance runs over, and men are no longer willing to be plunged into an abyss of injustice," the bolded phrase creates a mood of __________ among the audience A.Panic B.Despair C.Anger D.Anticipation

**Math**

A.625-465=$160 he has to pay for 2 days=160 $ rent paid for 1 day=260/2=$80 amount paid for 5days=8*5=$400 But he paid $465 Difference 465-400=$65 so every one has to pay $65+rent for the no. of days total rent for x days y=65+80 x (dollars) B. f(x)=65+80 x

**Math**

Is |5|and |-5|equal? Its really hard to figure out.

**PLEASE HELP MS. SUE HELP ME WITH THIS SCIENCE**

2.a 3.b 4.d 5.c

**chemistry**

If 6.30 moles of C5H12 reacts with excess O2, how many moles of CO2 will be produced in the following combustion reaction?

**Applying Rational Number Operations**

Do u think that is going to help Ruby no offense I just really need help

**Applying Rational Number Operations**

HELP PLEASE

**Applying Rational Number Operations**

(7th grade regular math) One half liter of lemonade concentrate is added to 3 liters of water. How many 1/3-liters serving are made? How would you do the math for this question? Please help I really need this question answered

**chemistry**

Thanks

**chemistry**

Write potassium sulphate +barium nitrate ¨ potassium nitrate + barium sulphate as a balanced symbol equation

**math help needed!**

Estimate the instantaneous rate of change of the function f(x) = x ln x at x = 1 and at x = 3. (Use h = 0.1, 0.01, 0.001, 0.0001, and so on. Round your answers to four decimal places.)

**math**

Find the derivative algebraically. g(t) = t^2 + t at t = −1 I can't seem to start this problem correctly. What is the process required for this question?

**math please help me!**

This is what I have done so far for part a: I plugged in h = 0.01 got f'(1) = 1.004983416 h= 0.001, which equals 1.0049 h = 0.0001, and got 1.000049998 h = 0.00001 and got 1.000005 h 0.000001 and got 0. I tried putting in 1.0049, 1.0050, and 0.0000 in but none of those ...

**math please help me!**

Estimate the instantaneous rate of change of the function f(x) = x ln x at x = 1 and at x = 3. (Use h = 0.1, 0.01, 0.001, 0.0001, and so on. Round your answers to four decimal places.) f '(1) = f '(3) = What do these values suggest about the concavity of ...

**math help please!**

Nevermind, I got it! I just needed to zoom out more on my graph.

**math help please!**

I got zero for part a by plugging the function into a calculator but I still do not get part b.

**math help please!**

Assuming that limits as x → ∞ have the properties for limits as x → c, use algebraic manipulations to evaluate lim x → ∞ for the function. a. f(x) = x − 2/2 + 6x^2 b. f(x) = x^2 + 6/x + 7 Please help! I do not know how to start with this ...

**math/physics**

Wait nevermind! I got it! Thank you so much!

**math/physics**

How do you find the vertex? Do you just put it into a graphing calculator?

**math/physics**

A pomegranate is thrown from ground level straight up into the air at time t = 0 with velocity 96 feet per second. Its height at time t seconds is f(t) = −16t2 + 96t. a) Find the time it hits the ground. t=? s b) Find the time it reaches its highest point. t=?s c) What ...

**math**

Thank you so much! I missed the negative part about the term which definitely impacted the answer.

**math**

Determine the end behavior of the function as x → +∞ and as x → −∞. f(x) = 1000 − 39x + 51x^2 − 10x^3 As x → +∞, f(x) → ???? . As x → −∞, f(x) → ??? I know that the end behavior of the function...

**math please help!!**

Thank you so much! That helped a lot!

**math please help!!**

The depth d of water in a tank oscillates sinusoidally once every 4 hours. If the smallest depth is 7.9 feet and the largest depth is 10.1 feet, find a possible formula for the depth in terms of time t in hours. (Let the water depth be at the average when t = 0.) I got y=1....

**math**

thank you!!!! I did mess up the period. I didn't think about it that way. Thank you so much!

**math**

The desert temperature, H, oscillates daily between 36°F at 4 am and 56°F at 4 pm. Write a possible formula for H in terms of t, measured in hours from 4 am. I thought the answer is -10cos(1/6pi times t) +46 but it got marked wrong. I thought that the amplitude is 10 ...

**math! please help!**

Thank you so much!! That really helped!

**math! please help!**

For a boat to float in a tidal bay, the water must be at least 2.7 meters deep. The depth of the water around the boat, d(t), in meters, where t is measured in hours since midnight, is d(t) = 5 + 4.6 sin(0.5t). (a) What is the period of the tides in hours? (Round your answer ...

**Math**

A banquet hall has 22 tables for 4 and 15 tables for 6 ,but 3 chairs are missing from the tables .How many many chairs will there be if 134 are seated

**math**

If you have to find f(t)g(t) where f(x) = 2/x and g(x) = 4x+2 I got 2/t times 4t+2 and then from that I got 8t+4/t. How do I simplify that further?

**math**

Just kidding! I got it!

**math**

Find f(g(x)) where f(x) = 2/x and g(x) = 4x+2 I got till 2/(4x+2) but am not sure where to go from there. Please help!

**math**

For the data I gave above, we need to find a formula for the exponential function. I got b to be 605. That part is right at least, right? Because of how 605 = b times a^0 which means b equals 605. (0 because the 605 matches up with sea level in the data--I posted it weirdly) ...

**math**

How did you get the 0.0000917? I plugged log(1.096) divided by 1000 and got 3.98 times 10 to the -5.

**math**

For example, when I try to solve an equation like 1.096 = a^1000, what should I do? I'm trying to find a formula for this set of data and that's how I got the above equation: d=??? Elevation (ft) Sea level labeled h 1000 2000 3000 4000 Takeoff roll (ft) labeled d 605 ...

**math**

Thank you! I forgot that you could divide the two!

**math**

Given an exponential graph that are concave up and the points (1,4) and (-1, 16), give a possible formula of the function. I plugged the variables into the f(x)=b times a^x and got: 4= b times a^1 and 16=b times a^-1 I am not sure where to go from here.

**math**

Thank you so much for all of your help!

**math**

A town has a population of 2000 people at time t = 0. In each of the following cases, write a formula for the population, P, of the town as a function of year t. (a) The population increases by 60 people per year. I thought it would be P= 2000 (1.03)^t (b) The population ...

**Math**

Wow, you're a genius! Thank you so much, that worked! I didn't even think about involving the quadratic equation! Thank you again!

**Math**

For better clarification, the first part to this problem had (0,2) instead of (0,b) and the answer came out to be (-2,4). I kind of guess and checked for that question.