Posts by natalie
Total # Posts: 709

Biology
I need help in bio anyone take bio B I’m desperate 
math
Find the sum (assume x < 1/3): 1+3x+9x^2+27x^3+81x^4+...=?  thank you!

Math
write an inequality to represent the situation: The temperature stayed above 15 
Math
What is the sum of 14 and the opposite of 12? A) 26 B) 2 C) 2 D) 26 14+12=2? Am I right? 
Math
Which multiplication has a negative answer? A) (1)(1) B) (1)(1)(1)(1) C) (1)(1)(1)(1)(1) D) (1)(1)(1)(0) c? 
chemistry
6NH3 + 2H2BO33N2H4 + 2B+ 4H2O+ 2OH name of the element oxidized:? name of the element reduced:? formula of the oxidizing agent:? formula of the reducing agent:? 3N2H4 + 2ClO33N2 + 2Cl+ 6H2O name of the element oxidized:? name of the element reduced:? formula of the ... 
Chemistry
Consider the reaction when aqueous solutions of silver(I) nitrate and manganese(II) chloride are combined. The net ionic equation for this reaction is? Consider the reaction when aqueous solutions of cobalt(II) sulfate and lead(II) nitrate are combined. The net ionic ... 
Math
In the exercise we want to use a substitution to integrate integral xsqrt(x+1)dx. Find the substitution u to transform the integral into integral(u1)u^(1/2)du. u=? 
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^225 and y=0. 5/2,5/2 Find the area bounded by the curves y=4x^225, 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.  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= ...  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?  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?  I also agree with I agree and Anonymous

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 ...  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
 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 nationstates write constitutions? A: Constitutions give citizens unlimited powers. B: Constitutions establish nationstates. C: Constitutions allow governments to elect leaders D: ...  100% answers are a b d
 Kenz is correct, I got 100
 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 ...  Nilsa converted 1/12 to a repaeting decimal and wrote 0.083 as her answer what error did she make
 What happens when a boy and a girl have sex?
 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 ...  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?  @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?  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  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(5x3)=0 ans= x=3/5 7. log5^x=3 ans= x^3=5 8. log2^32=x ...  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=6^2x1 Ans.= x=1 2. 3^x=1/27 Ans.= x=9 3. e^3x=10 Ans...  Sure! No problem👻
 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...
 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/precalculus
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?  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?  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  I think "c" is the best answer :)
 google search the first part of the equations i have it up with the picture

Physics
A woman holds a 1.90mlong uniform 5.0kg 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 ...  Its not d
 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  A.625465=$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 465400=$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 5and 5equal? Its really hard to figure out.  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?  Do u think that is going to help Ruby no offense I just really need help
 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 1/3liters serving are made? How would you do the math for this question? Please help I really need this question answered  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?  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 ...  Nevermind, I got it! I just needed to zoom out more on my graph.
 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 ...  Wait nevermind! I got it! Thank you so much!
 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 ...  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...  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....  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 ...  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?