Sunday

February 19, 2017
Total # Posts: 582

**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.

*February 16, 2017*

**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.

*February 3, 2017*

**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 ...

*January 25, 2017*

**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 ...

*January 20, 2017*

**mathss**

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

*January 19, 2017*

**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 ...

*January 19, 2017*

**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

*November 18, 2016*

**Math**

Please just answer the question T^T ples

*November 9, 2016*

**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 ...

*November 5, 2016*

**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 ...

*November 4, 2016*

**Maths (really hard)**

The points A(1,5) and B(9,3) are part of a triangle Î”ABC. 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.

*November 1, 2016*

**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).

*November 1, 2016*

**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).

*October 31, 2016*

**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.

*October 31, 2016*

**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).

*October 31, 2016*

**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 ...

*October 13, 2016*

**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?

*October 3, 2016*

**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

*October 3, 2016*

**Geometry**

Thank you! :)

*September 10, 2016*

**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?

*September 10, 2016*

**Algebra**

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

*September 8, 2016*

**geography**

Sun burns

*September 8, 2016*

**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

*September 1, 2016*

**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/...

*August 23, 2016*

**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.)

*August 2, 2016*

**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...

*July 15, 2016*

**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.

*May 11, 2016*

**Math**

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

*May 6, 2016*

**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 ...

*May 6, 2016*

**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?

*April 18, 2016*

**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

*March 6, 2016*

**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?

*March 6, 2016*

**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

*January 28, 2016*

**Equations and Inequalities Unit Test**

Y-5_<6

*January 20, 2016*

**Calculus III**

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

*November 30, 2015*

**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 =

*November 24, 2015*

**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.

*November 17, 2015*

**Math**

Lol Idk

*November 17, 2015*

**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...

*November 11, 2015*

**civics**

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

*November 2, 2015*

**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 ...

*October 27, 2015*

**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‾‾&#...

*October 22, 2015*

**Science**

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

*October 16, 2015*

**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?

*September 21, 2015*

**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.

*September 15, 2015*

**Geometry**

Would it be A then?

*September 15, 2015*

**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

*September 15, 2015*

**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.

*September 4, 2015*

**Math**

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

*August 29, 2015*

**Math**

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

*August 29, 2015*

**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.

*August 29, 2015*

**Math**

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

*July 14, 2015*

**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.

*June 4, 2015*

**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 ...

*May 19, 2015*

**Chemistry**

how many grams of Nano3 are in 0.755 moles of nano3

*April 1, 2015*

**7th grade math (probability)**

mark has $186 in his savings account. he withdraws $94, deposits $56,and then withdraws $70.

*March 30, 2015*

**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?

*March 20, 2015*

**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 ...

*March 18, 2015*

**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.

*March 18, 2015*

**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?

*March 12, 2015*

**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...

*March 10, 2015*

**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?

*March 10, 2015*

**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?

*February 6, 2015*

**math**

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

*February 2, 2015*

**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

*February 2, 2015*

**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...

*January 30, 2015*

**Pre-Calc**

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

*January 16, 2015*

**math**

just answer my question

*January 11, 2015*

**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!!

*January 11, 2015*

**math**

thats my middle name

*January 11, 2015*

**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)

*January 11, 2015*

**college pre-calculus**

how do you do it

*January 11, 2015*

**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.

*December 31, 2014*

**math**

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

*December 31, 2014*

**math**

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

*December 31, 2014*

**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 ...

*December 29, 2014*

**Fraction**

13+7 5/8 equals 5/8

*December 8, 2014*

**algebra**

someone know about adding and subtracting denominator

*November 24, 2014*

**algebra**

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

*November 24, 2014*

**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)

*November 21, 2014*

**algebra**

thank's

*November 21, 2014*

**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?

*November 21, 2014*

**plz help. math**

alright thank you

*November 21, 2014*

**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?

*November 21, 2014*

**algebra**

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

*November 21, 2014*

**Science**

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

*November 2, 2014*

**Law**

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

*November 2, 2014*

**Constitutional Law**

Thanks Ms Sue will start off my assignment soon

*November 2, 2014*

**physics**

A block of mass m1 = 2.4 kg slides along a frictionless table with a speed of 8 m/s. Directly in front of it, and moving in the same direction, is a block of mass m2 = 5.0 kg moving at 2.8 m/s. A massless spring with spring constant k = 1140 N/m is attached to the near side of...

*October 17, 2014*

**Physics**

Damon, Thank you so much

*October 15, 2014*

**Physics**

A 38.0-kg boy, riding a 2.37-kg skateboard at a velocity of +5.07 m/s across a level sidewalk, jumps forward to leap over a wall. Just after leaving contact with the board, the boy's velocity relative to the sidewalk is 6.06 m/s, 10.35° above the horizontal. Ignore any...

*October 15, 2014*

**Physics**

The speed of the car at the base of a 30 ft hill is 45 mi/h. Assuming the driver keeps her foot off the brake and accelerator pedals, what will be the speed of the car at the top of the hill?

*October 15, 2014*

**Physics**

The pilot of an aircraft wishes to fly due west in a 50.0 km/h wind blowing toward the south. The speed of the aircraft in the absence of a wind is 228 km/h. a) How many degrees from west should the aircraft head? Let clockwise be positive. Answer in units of degrees. b) What ...

*October 15, 2014*

**Physics**

A basketball player makes a jump shot. The 0.580-kg ball is released at a height of 1.90 m above the floor with a speed of 7.18 m/s. The ball goes through the net 3.05 m above the floor at a speed of 4.23 m/s. What is the work done on the ball by air resistance, a ...

*October 11, 2014*

**Physics**

ahhh thanks but just a tad late lol, due already

*October 10, 2014*

**Physics**

A camera falls from a blimp that is 399 m above the ground and rising at a speed of 9.75 m/s. Find the maximum height reached by the camera with respect to the ground. The acceleration of gravity is 9.8 m/s^2.Answer in units of m. b)Find the speed at which it hits the ground....

*October 10, 2014*

**Physics**

Buddy is unloading 7kg cans using a 45 degree downward ramp. The ramp was made slippery by the a detergent spill before. Buddy can push the cans off of his truck with an initial velocity of .2 m/s and it moves as 1.2 m/a by the time it reaches the lowest point on the ramp. The...

*October 7, 2014*

**Physics**

The drawing below shows a person who, starting from rest at the top of a cliff, swings down at the end of a rope, releases it, and falls into the water below. There are two paths by which the person can enter the water. Suppose he enters the water at a speed of 18.5 m/s via ...

*October 3, 2014*

**Physics**

A 7300-kg satellite has an elliptical orbit, as in the figure. The point on the orbit that is farthest from the earth is called the apogee and is at the far right side of the drawing. The point on the orbit that is closest to the earth is called the perigee and is at the far ...

*October 3, 2014*