# Posts by Sam

Total # Posts: 5,194

History
Ok, thanks.

History
Am I correct?

History
Which statement best explains the reason the Americans were never able to capture St. Augustine in Florida. A) A lack of cooperation among commanders led to poor execution.*** B) Poor planning and incompetent leaders led to disastrous outcomes. C) The Americans were not as ...

Algebra
Cindy bought a car for \$14000. The car is depreciating every year at a rate of 2%. Write an equation and what is the value of her car after 5 years.

chemistry
An 80.0-gram sample of a gas was heated from 25 °C to 225 °C. During this process, 346 J of work was done by the system and its internal energy increased by 8305 J. What is the specific heat of the gas?

chemistry
Liquid sodium is being considered as an engine coolant. How many grams of liquid sodium (minimum) are needed to absorb 7.00 MJ of energy (in the form of heat) if the temperature of the sodium is not to increase by more than 10.0 °C? Use CP= 30.8 J/(K·mol) for Na(l) ...

chemistry
When 1367 J of heat energy is added to 44.1 g of hexane, C6H14, the temperature increases by 13.7 °C. Calculate the molar heat capacity of C6H14.

chemistry
In a constant-pressure calorimeter, 60.0 mL of 0.300 M Ba(OH)2 was added to 60.0 mL of 0.600 M HCl. The reaction caused the temperature of the solution to rise from 21.75 °C to 25.84 °C. If the solution has the same density and specific heat as water (1.00 g/mL and 4....

chemistry
An 80.0-gram sample of a gas was heated from 25 °C to 225 °C. During this process, 346 J of work was done by the system and its internal energy increased by 8305 J. What is the specific heat of the gas?

chemistry
If you combine 360.0 mL of water at 25.00 °C and 120.0 mL of water at 95.00 °C, what is the final temperature of the mixture? Use 1.00 g/mL as the density of water.

Math
A hemispherical tank has a diameter 10cm is fixed by water issuing from a pipe of radius 20cm at 2m per second. Calculate currently to 3.s.f the time in mind Tessa it take to fixed the tank.

Calculus
The measurement of the radius of a circle is 16 inches, with a possible error of .25 inches. Use differentials to approximate the possible propagated error in computing the area of the circle and find the percent error. I've gotten to 2Pi*16*.25 but don't know what to ...

Social Studies
He didn't try hard enough.

algebra/AP physcis
how do i solve for v in the equation: v^2/.6=1.2v^2/.6 +9.8

Physics
A stone is tied to a string (length = 0.600 m) and whirled in a circle at the same constant speed in two different ways. First, the circle is horizontal and the string is nearly parallel to the ground. Next, the circle is vertical. In the vertical case the maximum tension in ...

All of math
What are all the answers to unit 4 lesson 11

Chemistry
I have a 0.6573g mixture of NaHCO3 and Na2CO3. Calculate the mass of NaHCO3 and Na2CO3 in the unknown mixture.Also calculate the mass of NaCl formed in the reaction of the mixture and HCl.

PHYSICS- PROJECTILE MOTION
Crickets Chirpy and Milada jump from the top of a vertical cliff. Chirpy just drops and reaches the ground in 3.10 s , while Milada jumps horizontally with an initial speed of 89.0 cm/s. How far from the base of the cliff will Milada hit the ground? Ignore air resistance.

PHYSICS- PROJECTILE MOTION
A physics book slides off a horizontal table top with a speed of 1.90 m/s. It strikes the floor after a time of 0.410 s. Ignore air resistance. a) Find the magnitude of the horizontal component of the book's velocity just before the book reaches the floor. b) Find the ...

chemistry
what is the skeleton chemical equation of this? And Balanced equation. Copper (ii) chloride + Lithium --> Lithium Chloride + Copper

chemistry
what is the skeleton chemical equation of this? And Balanced equation. Copper (ii) chloride + Lithium --> Lithium Chloride + Copper

Math
nothing

Math
thank you and sorry damon

Math
Jean Claude equally shared a box of chocolates with two of his friends. The box weighed 9/5 pounds. How many pounds of chocolate did each person receive?

Statistics
A science teacher gives a test with 15 questions. This teacher is a hard grader. The teacher assigns points in the following manner: a correct answer = +1 point, an incorrect answer = -1 point, no answer = 0 points. So scores on the test could range from +15 to -15. The ...

Statistics
Suppose that 40 students take a quiz and everyone in the class scores an 80. The standard deviation of scores for this quiz is: 80 2 0

Statistics
A college statistics class conducted a survey of how students spend their money. They asked 25 students to estimate how much money they typically spend each week on fast food. They determined that the mean amount spent on fast food is \$31.52 with a standard deviation of \$21.60...

maths
A man buys lemon at 6 for rs 10 and sells at 8 for rs.15 find his gain percent

chemistry
Consider the following reaction. 4Fe + 3O2 2Fe2O3 a. How many moles of O2 are required to react completely with 46.7 mg of Fe? How many grams Fe2O3, are produced from the complete reaction of 20.1 g of Fe?

Physics
An asteroid has a mass of 3.66 x 10^20 kg and a radius of 8.2 x 10^5 m. If a 25 kg mass is dropped fro 10 m above the "ground" of the asteroid, how long will it take the mass to fall to the ground?

physics
An 8000 kg elevator is supported by a steel cable. If the acceleration of the elevator is 1.4 m/s^2 upward, then find the tension in the cable.

Geometry
1) What are the converse, inverse, and contrapositive of the statement? Which statements are true? If the figure is a rectangle with sides 2 cm and 3 cm, then it has a perimeter of 10cm. My A: the statement is not true. 2) What are the hypothesis and the conclusion of the ...

Calculus 1
Rick has 1200 feet of fence that he wants to use to enclose a rectangular garden. Find the maximum area the garden can have.

maths polynomial need help
4m^4-24m³+33m²+9m-9=0 help me with factor

Physics
An Australian emu is running due west in a straight line at a speed of 12.8 m/s and slows down to a speed of 7.7 m/s in 7.4 s. (a) What is the direction of the bird’s acceleration? (b) Assuming that the acceleration remains the same, what is the bird’s velocity after...

damon-steve- help statistics
Statistics City XYZ has 8800 registered voters. There are two candidates: Peter and Paul. A poll of 600 randomly selected registered voters was conducted. We know that 331 said they'd vote for Peter and 251 said they'd vote for Paul. We also know that 18 were undecided...

Math
it correct yeah

maths
let the number be a:b=2:3 a+b=30 now a/b=2/3 a=2b/3 input above 2b/3+b=30 2b+3b=90 5b=90 b=18 i live to to find the other value now

Algebra2-nothing to simplify
i-5/2i what i see nah

math 115
volume=width*hight*lenght volume=100, 100m*290*29m volume=29000029m^3 icubic meter=1000,000meter then there is 29000029 cubic meter 2.9000029*10^13

math
1/2(-4+5/4) 1/2(-16+5/4) 1/2(-11/4) -11/4 is between them

percentage

Math-honestly i hope am right
a+b=15 a^2b^3=m a=15-b (15-b)^2b^3=m (225-30b+b^2)b^3=m 225b^3-30b^4+b^5=m dm/db=675b^2-120b^3+5b^4 at dm/db=0 675b^2-120b^3+5b^4=0 b^2(675-120b+5b^2)=0 divide through by b^2 5b^2-120b+675=0 divide through by 5 b^2-24b+135=0 plz solve quadracticly and sub into the first ...

Math-honestly i hope am right
a+b=15 a^2b^3=m

Calculus
okay (x^2-x+1)-2[(x^2-x+1)(2x-1)(x-2)]/(x^2-x+1)^4 (x^2-x+1)-2[(2x-1)(x-2)](x^2-x+1)/(x^2-x+1)^4 factor out (x^2-x+1) (x^2-x+1)[-2(x-1)(x-2)]/(x^2-x+1)^4 -2(x^2-3x+2)/(x^2-x+1)^3 plz do wait for mathematician steve to come complete it for you but that the simplification am sure

Algebra
Suppose that a cyclist began a 390 mi ride across a state at the western edge of the state, at the same time that a car traveling toward it leaves the eastern end of the state. If the bicycle and car meet after 6.5 hr and the car traveled 32.4 mph faster than the bicycle, find...

Analytical chemistry
A solution is created using 2.1700 grams of Calcium Hydroxide (MW is 74.093) in a 1L volumetric flask. A 50 mL aliquot is then taken and aded to a 350 mL volumteric flask and filled to the line. Finally, a 10 aliquot of the that solution is taken and added to a 100 mL ...

Analytical chemistry
0.6140 grams of sodium phosphate (Na3PO4) was dissolved in 2 L of water to make a stock solution. 34 mL of this solution is then diluted to 100mL volumetrically to prepare the final solution. Calculate the molarity of phosphate ions in this solution. Answer to 5 decimal places.

math condense logs
it is the same thing bro log and ln

math condense logs
3logx-6log(x^2+1)+log25 logx^3-log(x^2+1)+log25 logx^3+log25-log(x^2+1)^6 log(x^3*25/(x^2+1)^6))

maths asap need help
let the perpendicular distance of a line L from the origin l = 5 and let this perpendicular make an angle @ = pi/6 with the x axis. Determine the normal equation of l? Plz show me working

Math (Expanding logarithmic expression)
you can just say lnx^3-lnx^2+lnx-ln1 lnx^3-lnx^2+lnx-0 which is lnx^3-lnx^2+lnx

Math (Expanding logarithmic expression)

Psychology
HI i don't know the synopsis of the ted talk " stroke of insight" i thought the bigger picture would be that the right and left part of the brain are different but .y teacher said that is not the case

Pre-Calculus
csc theta = (sqr root 5) over 15, find sine theta

Pre-Calculus
If csc theta = square root of 5 divided by 15, find sin theta

Math
Darcy needs 1/4 yard of fabric to make a banner. She has 2 yards of fabric. How many banners can she make?

Math
What do you use to identify the specific name or line segment?? I really don't understand what my teacher is looking for, any help would be awesome.

Physical education HELP PLS!!!!!!!!!
I'm pretty sure it's D

Maths
Find the sum of the area of the ceiling and the floor of a room of 5m long, 4m wide and 2.5 high.

maths need help
Father is aged three times more than his son Ronti. After 8 years , he would be two and a half times of Ronti's age. After further 8 years, how many times would he be of Ronti's age?

Research Methods
An infomercial asserts, “A study proves that Fat-Be-Gone, and it will work for you also.” What is wrong with this statement?

trigonomentry using either exponential or complex
give the expansion of sin^8@ as a series of cos@ plz help me i only know the normal way of doing that but i do not know how to apply complex number or exponential

maths plz help
give the expansion sin^8@ as a series of cos@ plz help me show working where @ means theta

mathematics need help
find the parametric equation for the line with slope 3 and y-intercept -2 where 't' is any real number?

Math
How would I solve x2+3x+1/4 into standard form? Would I multiply everything by 4 to cancel out the 1/4 so it will cancel it. Giving me 4x2+12+1 then factoring out

maths need help
correct to one significant figure how many digit are there in expansion of 2^(1999)

Chemistry
At constant pressure, which of these systems do work on the surroundings? A(s)+B(s)-->C(g) 2A(g)+2B(g)--> 3C(g) A(g)+B(g)-->3C(g) 2A(g)+3B(g)-->4C(g) I've tried everything and I just don't understand what I'm doing wrong.

History
A fundamental theme of the Gettysburg address is A. The condemtion of unnecessary violence** B. The description of the impact of the civil war I got it narrowed down to these, I think it is A though

History
Can someone check this? The organizational patter of the Gettysburg Address is: A. problem and solution B. Compare and contrast C. Chronological D. Order of importance***

Math HELP!
The first thing you need to do is the parentheses so {(82-4)-4} (82-4)=78 78-4=72 Now that the parenthesis are done, divide 72 by 6. 72 divided by 6 is 12.

ss
I think the answer is B

Chemistry
How many milliliters of a 0.48 M HCl solution are needed to react completely with 7.4 g of zinc to form zinc(II) chloride? Answer in units of mL.

Social Studies
The Spanish colonists

Social Studies
What kind of relationship did colonists have with the Native Americans A. The two groups were equals B. Colonists ignored Native Americans C. Native American taught colonists religious rituals D. Colonists treated Native Americans poorly

chem help!
answer is C rate of forward reaction is always equal to rate of reverse reaction.

Chemistry
What changes of state are involved in this use of ethyl chloride? Select all that apply. Select all that apply. 1-liquid to gas 2-liquid to solid 3-gas to solid 4-liquid to solid 5-solid to liquid 6-solid to gas

Social Studies

Math
5m^4/3(m^1/3*2n^1/8)

Algebra
A 116-cm board is cut into two pieces. If one piece is 40-cm shorter than the other, how long are the two pieces?

Science
MMR causes autism Help with the connection between MMR vaccine to autism pros and cons

english
A mile from end to end, yet as close to as a friend. A precious commodity, freely given. Found on the rich, poor,short and tall, but share among children most of all What am I?

Pathway to Statistics
a. What value of T represents the temperature that is 16°F below​ zero? b. A student says that T represents only positive numbers and​ zero, because there is no negative sign. Is the student​ correct? Explain

math
What number must be added to each of the numbers 1, 3, and 6 in order for the resulting numbers to form a geometric sequence?

economic
find the competitive price and quantity (as if the above marginal cost curve represents the market supply curve. given the market demand equation P=100-.1Q and TC=1000+20Q+.4Q^2

algebra help
Please help me with this and if you can explain please, okay so i have x-y=0 and x-2y=6 i have to solve by using substitution, at first i though i can replace x-2y=6 with x but then i notice that i can't can i put one of the equations into y=? Please help me with this ...

algebra
How do i do this okay i have x=17-4y and y=x-2 i have to solve by using substitution i don't get it do i replace x-2 for x then solve please help me

geography
Which of the thematic map would best show the location of climate zones?(qualtative map, cartograms, and flow- line maps)

Social studies
3) which of the following is an advantage of a presidential government? A) the president is elected independently of the legislature B) the president is part of the leg. Branch of government. C) a system of checks and balances increases legislative power. D) a system of checks...

Geometry
Three colinear points on the coordinate plane are R(x,y) S(x+8h, y+8k) and P(x+6h,y+6k0 Determine value of RP/SP and RP/RS?

American Government
Is it really b?? @mass

Social studies
Which of the following is an advantage of a presidential government? A) the president is elected independently of the legislature B) the president is part of the legislative branch of government C) A system of checks and balances increases legislative power. D) is there checks...

Social Studies
Is it D then?

Calculus
Use L'Hoplital's rule to find the limit. Lim x->0 (3-3cos(x))/(sin(4x))

Calculus
The velocity of an object is given by the velocity function v(t)=t/42. If the object is at the origin at time t=0, find the position at time t=20.

math
A shipment of 9 printers contains 4 that are defective. Find the probability that a sample of size 4​, drawn from the​ 9, will not contain a defective printer . the probability is ?

chemistry
calculate the mass of potassium hydrogen phthalate needed to prepare a 0.1M solution in a 250 ml volumetric flask given that the molar mass of potassium hydrogen phthalate is 204,23g/mol

Ap govt.
Please check my answers and help me with those that are wrong. Which of the following forms of government most clearly bases power on the consent of the governed? A. aristocracy B. totalitarian regime C. Oligarchy D. Anarchy E. Republic I put A All of the following are factors...

Grammar
Every paragraph should begin with a topic sentence. Is this True.

c programming
write a program that computes tax and tip on a restaurant bill for a patron with rs.44.50 per meal charge.the tax should be 6.75 percent of the meal cost.the tip should be 15 percent of the total after adding the tax.display the meal cost,tax amount,tip amount and total bill ...

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