Posts by steven

Total # Posts: 592

France
What happened during the 1948 War?

France
When did France grant independence to Syria?

Chemistry
For the combustion of acetylene: 2C2H2(g) + 5O2(g) ? 4CO2(g) + 2H2O(g) ?H = -2511 kJ What is the enthalpy change when 2.80 g of C2H2 (g) reacts with excess oxygen.

Math geometry
The surface area of a cube is 96in2.what is the volume of the cube?

social studys
a d a c is right thanks everyone

Chemistry
If one wanted to a make a 500.0 mL of 4.5 x 10-6M solution of this red dye, how many grams would they need to weigh out? The molar mass of the dye is 492 g/mol. SHOW WORK.

math
After a drought, the Great Salt Lake in Utah covered an area of 2450 kilometers squared or 35/64 the area of the lake under normal weather conditions. Find the area of Great Salt Lake under normal weather conditions.

physics
A long straight vertical wire of diameter 2.0mm carries a steady current upwards. At 30mm from the centre of the wire, the magnetic field strength is 0.10mT. Sketch a graph to show the variation of magnetic field strength from the wire surface to a distance of 40mm from the ...

maths please help me
NOTE: before you answer this question, please be aware that there aren't meant to be any full stops after the '2' or the 'i=0'. Also the underscores '-' represent how the following number is meant to be a lower case number. The ^ represents root ...

mathss
Write the following polynomial in summation notation: 2 + 3x + 4x^2 + 5x^3

maths
NOTE: before you answer this question, please be aware that there aren't meant to be any full stops after the '2' or the 'i=0'. Also the underscores '-' represent how the following number is meant to be a lower case number. The ^ represents root ...

maths
Find all possible solutions in the range 0°? x ? 180° of the following equations: (a) cos x = sqrt(2) / 2 (b) tan x = sqrt(3) / 3 (c) sin x = sin60° (d) cos x = -1/2 (e) sin x = -1/2

Math
Please just answer the question T^T ples

PHYSICS
An aeroplane makes in emergency landing without landing gear. If the aeroplane touches down with a horizontal speed of 60.0ms^-1 and the coefficient of friction for aluminium on asphalt is ? = 0.500, how far will the aeroplane slide before coming to rest? You may assume that ...

PHYSICS (REALLY DIFFICULT PLEASE HELP)
An aeroplane makes in emergency landing without landing gear. If the aeroplane touches down with a horizontal speed of 60.0ms^-1 and the coefficient of friction for aluminium on asphalt is ? = 0.500, how far will the aeroplane slide before coming to rest? You may assume that ...

Maths (really hard)
The points A(1,5) and B(9,3) are part of a triangle ΔABC. The triangle has a right angle at A and and sides satisfy AB=2AC. Find a point C such that C lies above the line AB.

maths
(a) Find the points which divide the line joining A(1,3) and B(-4,-1) internally in the ratios: (i) 1:2 (ii) 1:1 (iii) 3:1 (b) On the same x-y axes plot the point A(1,3) and B(-4,-1) and draw the line joining them. Add the three points which you calculated in part (a).

Maths
(a) Find the points which divide the line joining A(1,3) and B(-4,-1) internally in the ratios: (i) 1:2 (ii) 1:1 (iii) 3:1 (b) On the same x-y axes plot the point A(1,3) and B(-4,-1) and draw the line joining them. Add the three points which you calculated in part (a).

MATHS URGENT PLEASE HELP
The mid-point of the straight line joining A(4,-3), B(6,-2) is located at C. (a) Calculate the coordinates of C. (b) Verify your result by calculating the distances AC and BC and showing they are equal.

MATHS URGENT PLEASE HELP
Calculate the lengths of the straight lines joining the following pairs of points, leaving your answers in surd form: (a) A(1,-5), B(6,10); (b) A(4,-3), B(7,6).

Probability
A box contains 6 pagers. Assume any pager selected from the box is done randomly, and hence selections are independent from each other. The probability of a selected pager being defective is 0.25. Let X be the random variable for the number of defective pagers. (a) Determine ...

algebra
If the order doesn't matter, what is the probability of drawing 1 brown and 2 orange marbles from a bag containing 5brown, 6yellow, 4blue, 3green and 2orange? Is it 5/20* 2/19* 1/18 or do I use a formula with factorials?

algebra
A bag of marbles contains 5 brown, 6 yellow, 4 blue, 3 green and 2 orange. What is the probability of: a) getting 3 yellow marbles, if 3 are taken at a time? b) getting 1 brown and 2 orange marbles, if 3 are taken at a time? a= 6/20* 5/19* 4/18 b=5/20* 2/19* 1/18

Geometry
Thank you! :)

Geometry
Line MP bisects <LMN, m<LMP=4x+3 and m<LMN=10x-6. Find m<LMN. I understand how to find adjacent angles and the complement. I don't understand what I am supposed to do? Since it already give you the answer 10x-6, should I solve for x?

Algebra
What is the square root of 58 to the nearest integer.

geography
Sun burns

Science
Which of the following questions is outside the scope of science? a. how are religion and philosophy different b.what is the diet of an american alligator c. how do humans digest protein d. how does gravity affect an airplane's motion

Economics
Consider a single price monopoly that faces a market demand curve for a good is given by the equation 𝑃=100−.1𝑄 and the total cost function is given as 𝑇𝐶=1000+20𝑄+.4𝑄2. a. What is the total fixed cost for this monopoly? P/...

math
Christine took out a 150-day loan for $2000 at 12% simple interest. After 60 days, she decided to make an early payment of $1000. What is the balance due on maturity date of the loan? (Round your answer to the nearest penny.)

Maths
Mr Sanderson makes some cookies for a festival day. She gave 1/4 of the cookies to her sister and 1/3 of the remainder to a neighbour. If she had 120 cookies left, how many cookies did she make in the beginning? Linda spent 1/4 of her money on books, 1/3 on food and 1/5 of the...

math (PLZ HELP ASAP)
After a drought, the Great Salt Lake in Utah covered an area of 2450 kilometers squared or 35/64 the area of the lake under normal weather conditions. Find the area of Great Salt Lake under normal weather conditions.

Math
X-3y=1 4x+5y=4 Solve the system of equations.

Math
A 100 point test contains a total of 20 questions. The multiple choice questions are worth 3 points each and the short response answer questions are worth 8 pints each. Write a system of linear equations that represents this situation, my answer is to correlate the 3 points ...

Math
So I'm doing solving system of equations, 2x+y=5 4x+2y=10 I found no solution that would fit it therefore they are parallel to each other. Am I correct?

Math
The feasible region shown below is bounded by lines 2𝑥 − 𝑦 = 2 , 𝑥 + 𝑦 = 2 , and y = 0. Find the coordinates of corner point A

Math
Jan is a 35-year-old individual who plans to retire at age 65. Between now and then $4000 is paid annually into her IRA account, which is anticipated to pay 5% compounded annually. How much will be in the account upon Jan’s retirement?

Science
It is B not A I just took the test

math
Given the cost function, C(x), and the revenue function, R(x), find the number of units x that must be sold to break even. C(x)=86x+3080, R(x)+108x

Equations and Inequalities Unit Test
Y-5_<6

Calculus III
The surface x^2−y^2=36 can be described using spherical coordinates in the form ρ=g(θ,ϕ)=

Calculus III
Evaluate ∭W f(x,y,z)dV for the function f and region W specified: f(x,y,z) = 18(x+y) W: y≤ z≤x ; 0≤y≤x ; 0≤x≤1 ∭W (18(x+y))dV =

Science
how the volume of air in a tank of compressed air would change if the volume of the tank doubled? My answer was: The volume of the air would increase and it would be more difficult to fit inside of the tank depending on if the tank was filled or not.

Math
Lol Idk

chemistry
A viral preparation was inactivated in a chemical bath. The activation process was found to be first order in virus concentration. The beginning of the experiment 2% of the virus was found to be inactivated per minute. [i] Evaluate k for the inactivation process in units (1/s...

History
d.)The States raised and provided the soldiers in the army and navy, and Congress appointed all the officers.

civics
thank you so much i guess i needed help with that as well

Physics
A compact car of mass 915 kg has an overall motor efficiency of 16.0%. (a) If burning one gallon of gasoline supplies 1.34 108 J of energy, find the amount of gasoline used in accelerating the car from rest to 55.0 mi/h. Here you may ignore the effects of air resistance and ...

Calculus III
Compute the length of the curve r(t)=5ti+8tj+(t2+4)k over the interval 0≤t≤6 Hint: use the formula ∫t2+a2‾‾‾‾‾‾‾√dt=12tt2+a2‾‾‾‾‾‾‾√+12a2ln(t+t2+a2‾‾&#...

Science
Measure the temperature on the first and last day of April.

math
j.k

Physics
Car A and B are facing each other at rest, 100 m apart. Car A accelerates at 5 m/s^2. Car B accelerates at 3 m/s^2. When and where do they meet?

geometry
A circle has a center at (8,2). The point is (3,7) is on the circle. What is the area of the circle, to the nearest tenth of a square unit? A. 22.2 square units B. 44.4 square units C. 157.1 square units D.314.2 square units HELP PLEASE, and thanks.

Geometry
Would it be A then?

Geometry
What is the perimeter of rectangle WXYZ, with vertices W(-3,7), X(-5,4), Y(1,0), and Z(3,3) to the nearest unit. PLEASE HELP. A. 36 UNITS B. 30 UNITS C. 22 UNITS D. 11 UNITS

Math
Which of the following is an asymptote of f(x)=(x^2+3x+2)/(x+2)*tan(pi*x)? A) x=-2 B) x=-1 C) x=1/2 D) x=1 E) x=2 Answer is C but I got A because substituting x for -2 makes the graph undefined.

Math
I believe it's like: y-4=4x+3y y-4=-(9-x) 4x+3y=-(9-x)

Math
y-4=4x+3y=-(9-x) What is the value of xy?

Math
5x/3+y=c 2y=c-4x x+y=6 What is c? I've tried substituting y as x-6 however I'm still not getting it.

Math
Explain how the graph of f(x) = ln x can be used to obtain the graph of g(x) = e^(x-2).

Science--HELP!!
1. Electrons 2. Atomic Model 3. Covalent Bond 4. Chemical bond 5. Either energy level or shell 6. Atomic theory 7. Atomic number Your answers are correct though I'm not sure about number 5.

macro
Assume that the utility function of a consumer is given by U = ln c1 + ln c2 The interest rate is given by 5% and the endowments are given by (y1, y2) = (100, 120). (a) Draw the budget constraint. (b) Calculate the consumption and saving in period 1. (c) Draw the indifference ...

Chemistry
how many grams of Nano3 are in 0.755 moles of nano3

7th grade math (probability)
mark has $186 in his savings account. he withdraws $94, deposits $56,and then withdraws $70.

math
Sam had 80 foreign stamps and local stamps. After giving away13of his foreign stamps and 10 local stamps, he had an equal number of foreign stamps and local stamps left. How many local stamps did he have in the beginning?

Phyisics
1. Two concentric conducting spherical shells have radii of 0.126 m. and 0.225 m. The inner sphere bears a charge of -8.00E-08 C. An electron escapes from the inner sphere with negligible speed. Assuming that the region between the spheres is a vacuum, compute the speed (in ...

Phyisics
3. A small sphere whose mass is 8.00E-03 g. carries a charge of 7.00E-08 C. It hangs from a silk thread which makes an angle of 30 degrees with a large charged, nonconducting sheet. Calculate the surface charge density (in coulombs/meter^2) for the sheet.

math
Lexi and Maria had $250 altogether. After Lexi spent25of her money and Maria spent $40, they had the same amount of money left. How much money did Lexi have in the beginning?

physics
a car set out at noon to ride from point a to point b, and another car started at 2 pm on the same day to ride from point b to point a. they met on the road at 4:05 pm, and each car reached their destination at exactly the same time. at what time did the car arrive?(hint: both...

physics
4. A ball is thrown so that it just clears a 3m fence 18m away. If it left the hand 1.5m above the ground and at an angle of 60° with the horizontal, what was the initial velocity of the ball?

algebra
Can someone explain how he got to this conclusion? I understand he answer and everything, but if you had to show work what would you do?

algebra
y=46

Language Arts
9 is c not A

math
At what value(s) of x does f(x)=(-4x^4)+(2x^2) have a relative maximum?

math
For what values of x is the graph y=2/(5-x) concave upward? x<5 x>-5 x>5 no values of x

L.A.
i got all correct THANKS!!!

Physics
A 50 kg satellite circles the earth in an orbit with a period of 110 min. What minimum energy E is required to change the orbit to one with a period of 320 min? Assume both the initial and final orbits are circular. The Earth’s radius is 6.37 × 10^6 m, its mass is 5...

Pre-Calc
Through how many radians does a circle of radius 1 foot rotate if it rolls 10 feet down the road?

math
just answer my question

math
simplify: 6-y/6/1/6-1/y 6-y/6*6y/y-6= 6y/6=y Is this correct help i need help!!

math
thats my middle name

math
simplify: square root (4/3)-square root (3/4) A. 2-sqaure root(3)/2 square root (3) B. square root (7/12) C. square root (3)/6 D. 2/square root (3) which answer? this is what i got square root (16/12)- square root (9/12)= square root (7/12)

college pre-calculus
how do you do it

math
For the curve given by 4x^2+y^2=48+2xy, show that there is a point P with x-coordinate 2 at which the line tangent to the curve at P is horizontal.

math
For the curve given by 4x^2+y^2=48+2xy, find the positive y-coordinate given that the x-coordinate is 2.

math
For the curve given by 4x^2+y^2=48+2xy show that ((dy)/(dx))=(y-4x)/(y-x)

Math
The twice–differentiable function f is defined for all real numbers and satisfies the following conditions: f(0)=3 f′(0)=5 f″(0)=7 a)The function g is given by g(x)=e^ax+f(x) for all real numbers, where a is a constant. Find g ′(0) and g ″(0) in ...

Fraction
13+7 5/8 equals 5/8

algebra
someone know about adding and subtracting denominator

algebra
Perform the indicated operation y/y-5+5/5-y

algebra
Which of the following points lies on the circle whose center is at the origin and whose radius is 10 (-6,4) (/10,/10) (6,-8)

algebra
thank's

algebra
The length of a rectangle is 3 more than twice the width. The area of the rectangle is 119 square inches. What are the dimensions of the rectangle? If x = the width of the rectangle, which of the following equations is used in the process of solving this problem?

plz help. math
alright thank you

algerbra
/2

algerbra
A triangle has sides of and 3. Which could not be the length of the third side if it is a right triangle? i need help anyone?

algebra
Solve this quadratic equation x^2 + 5x + 3 = 0

Science
"What amount of Barium hydroxide is needed to neutralize 500 kg of 18 molar Sulphuric acid?"

Law
Discuss the power lies within the Parliament in UK and whether the power of parliament had been limited in the present day.

Constitutional Law
Thanks Ms Sue will start off my assignment soon

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