# Posts by ANONYMOUS

Total # Posts: 109,610

**physics**

236

**maths**

If tan A=a/b prove that 2sec theta + 1/ cos theta+2=Õ a2+b2/b

**Math**

11/2-{(11/2X1/3)+(11/2X1/4)}=2 7/24

**Physics**

The relative density of an alloy is 6.5.a.find the mass of a solid cube of side 20cm.b.what volume of the alloy has a mass of 13kg

**Math**

In Virginia, the Grand Caverns is approximately 35 kilometers from the Frontier Culture Museum. You make a drawing of the two locations with a scale of 6 inches representing 35 kilometers. How far apart do you draw the Grand Caverns and Frontier Culture Museum?

**Maathhh**

30 students surveyed, 30% said their favorite juice was grape. How do I find out how many students that is?

**Algebra**

(i am new to this subject of algebra) Use the figure to answer the following questions: ( a triangle with the bottom right corner of it labeled L with (1, 1) x y coordinates. Left corner of the triangle is labeled M at the (-3, 1) coordinates. the top of the triangle is ...

**Math - Please help ASAP!**

The second one is B

**math**

s,e,l,e,c,t,e,d are in the bag allen picked a letter.What is the fraction,decimal,and percentage of not selecting a consonant

**chemistry**

how to calculate the oxidation state for 'cr' in K2CRO4 ?

**Chemistry**

molar mass of CO2=44g/mol We have 4.4g n= 4.4÷44=0.1mol CO2=0.1×6.022×10^23molecules =6.022×10^22 molecules 1 molecule of CO2 contains 2atoms of Oxygen 6.022×10^22 molecules would contain 6.022×10^22×2=1.204×10^23 that is 1.2&...

**Chemistry**

Agreed. We can't just spoon feed you.

**Algebra**

Thank you so much!!

**Algebra **

Solve the following equation. Show all steps. x/x-2+x-1/x+1=-1

**math**

Draw a shape that exhibits rotational symmetry of order 3 and 1 line of symmetry.

**Math**

Find the probability that theven pointer will stop on an odd number or a number less than 7

**Math**

(125/360) pi D^2/4

**Math**

well (4/5) x = -2 x + 3 4 x = -10 x + 15 14 x = 15 x = 15/14 then y = (4/5)(15/14) = 12/14 = 6/7 (15/14 , 6/7 )

**Math**

The first bee’s path to the hive follows the line: y = 4/5 x. The second bee’s path follows the line: y = -2x + 3.

**Math**

Two bees have found a food source. The first bee’s path to the hive follows the line . The second bee’s path follows the line . Their paths cross at the hive. Use substitution to solve the problem. What are the coordinates of the hive?

**Algebra**

1. The length of a rectangle is twice its width. The perimeter of the rectangle is 24 inches. Write a system of equations in 2 variables. Use substitution to solve the problem. A. Equation 1: Equation 2: _________________________________ B. What is the area of the rectangle?

**Physics**

x = .05 sin [2 pi (.5)t] = .05 sin 3.14159 t v = .05 pi cos pi t a = -.05 pi^2 sin pi t max a = .05 pi^2 max v = .05 pi 10 mm = 1 cm = .01 m x = .01 = .05 sin 3.14 t sin 3.14 t = .20 3.14 t = 11.5 degrees = .201 radians t = .0641 seconds v = .05 pi cos 11.5 degrees a = -.05 pi...

**Physics**

x = .08 sin 2 pi (100)t = .08 sin 628 t v = dx/dt = .08(628) cos 628 t a = d^2x/dt^2 = -.08(628)^2 sin 628 t so max a = .08(628^2) max f = m a = 8 * max a

**math **

Find the sum of 8x cube y +2xy cube -18and -12x cube y +7xy cube and subtract it from the sum of 19x cube y -17xy cube +12and -21+5xy cube .? PLEASE SOLVE IT ?????

**MATH**

If you roll a number cube 25 times, about how many times do you expect to roll a number greater than 3?

**Finance Question - Formulas**

Instead of spending the $50 a month you receive, you decided to invest it in your money market account at your bank. Assuming you will earn an average of 5% each year and inflation is forecasted to 2.5% a year, how much have you effectively earned after ten years? (Hint: must ...

**Math **

Slide is 7.5 m long maximum slope is 32 degrees how high can top of slide be?

**Algebra 2**

The seniors at Travis High School have three purchase options for their yearbook. Option 1: They can purchase a copy of the yearbook and a one-page ad for $35. Option 2: They can purchase a copy of the yearbook and a one-half page ad for $25. Option 3: They can purchase a copy...

**Consider the following equation: CO + 2 H 2 → CH 3**

.

**chemiste-ry**

Consider the following equation: CO + 2 H 2 â†’ CH 3 OH â–³H rxn = -128 kJ Calculate the amount of heat (in kJ) associated with complete reaction of 8.08 g H 2 .

**chemistry **

How to prove that sodium hydroxide is a base with the help of an equation for the reaction

**math**

find the largest number that will divide 220,313,and 716 leaving remainder 3 in each case?

**math**

in this question we will ad the both year population like this : 22,41,289 + 48,000 ---------- 22,89,289 ---------- so,the increased population in village is 22,89,289.

**math**

The population of a distrust was 22,41,289 two years ago if the population of the village increased by 48000 in two years what is the present population.? Solve and

**Algebra **

Student tickets to the Homecoming game cost $5 each. General admission tickets cost $8 each. So far, 150 tickets have been sold. $900 has been collected. A. Write a system of equations for this model in standard form. 5S = Student tickets: 100 sold 8G = General Admissions: 50 ...

**Algebra**

Are (50) and (100) the correct coordinates? just double checking.

**Algebra **

Student tickets to the Homecoming game cost $5 each. General admission tickets cost $8 each. So far, 150 tickets have been sold. $900 has been collected. A. Write a system of equations for this model in standard form. 8G = General Admissions: 50 sold 5S = Student tickets: 100 ...

**fractions **

Michael owns 3/8 of the shares in a company. he sold 1/3 of his shares to his friend. if there are a total of 7600 shares in the company, how many shares does michael still have left ?

**geometry**

A candle manufacturer sells cylindrical candles in sets of three. Each candle in the set is a different size. The smallest candle has a radius of 0.5 inches and a height of 3 inches. The other two candles are scaled versions of the smallest, with scale factors of 2 and 3. How ...

**Technology**

Calculate the force required to move a small pistons that has an area of 2m2,if the force of a large piston is 20n with an as area of 4m2.Hint use a formulae :a frorce of small piston divided by an area of small piston equal to force of large pistone divided by area of large ...

**Math**

Student tickets to the Homecoming game cost $5 each. General admission tickets cost $8 each. So far, 150 tickets have been sold. $900 has been collected. A. Write a system of equations for this model in standard form. B. Graph the system. ( let each square represents 20 units...

**Math**

Sin theta sin(90- theta) cos theta cos(90-theta)=0

**Algebra 1b**

Which of the following is false about |x| < n? Select one: a. x < n and x > –n b. It is a disjunction c. The graph is an intersection d. The graph does not include n

**math**

find the ratio x:y (hint: same as find x/y): 2 1/2 x = 4 1/2 y

**Math**

If a > b and c < 0, then: Select one: a. ac > bc b. a/c>b/c c. ac < bc d. None of the above I have no idea how to answer this questions because there aren't any numbers!

**Trig**

read C) again. She only took the + root. She should have taken both as you said.

**Trig**

Well, as I said, A) works

**Trig**

x = 1/2 t + 3 is 1/2 t = x - 3 which is t = 2(x-3) which is A) and y = 2 t - 1 is 2 t = y+1 which is t = (y+1)/2 which is not there unless D is a typo

**Math**

if n+1 = 5 then n = 4

**Calculus**

200 in + x direction F at angle 20 above x axis R = 340 at angle T above x axis 340 cos T =200 + F cos 20 340 sin T = F sin 20 solve for F and T F is magnitude we want The angle we want is 20 - T

**Physics**

x0 = 0 x1 = (1/2) 2 (100) v1 = 2*10 = 20 x2 = x1 + 20 (30) = x1 + 600 v2 = x1 = 20 time retarding = t 0 = v2 - 4 t so t = v2/4 then x3 = x2+v2(v2/4)-(1/2)(4)(v2^2/16)

**Math**

If ajay spent 1/9 of his pocket money of Rs.450 on chocolates and 2/5 on fruits. How much money is left with him?

**Algebra**

The members of a team can run 500 meters between 57 seconds and 73 seconds. A. Write an absolute value inequality describing the times for the runners. 57<t<73 B. Graph the inequality on a number line. Would like help on step B if possible and step A check.

**Algebra 1b**

The members of a team can run 500 meters between 57 seconds and 73 seconds. A. Write an absolute value inequality describing the times for the runners.

**GPA**

If I have a class that is over 100% right now and I have another class that is a 92%, would they balance out when calculating my GPA or not? (The rest of my classes are A's)

**where we split**

Where we split. You did nothing wrong, just made it harder :) ?ds = ?k/h dh s = k [ln h + ln C ] you said that was k ln (C h) which is correct but I said k ln h + c which is also correct, but my way made it easy

**Math (Calc) (Differential Equations)**

s = k ln h + c 25 = k ln 3 + c 10 = k ln 9 + c -----------------subtract 15 = k ln(3/9) = k ln (1/3) etc

**Algebra 2**

cos T(2 sin T + sqrt 3) = 0 well right off pi/2 and 3 pi/2 so what about sin T = -sqrt3/2 well then it is a 30,60, 90 triangle and we are talking about the 60 degree corner sin is - in quadrants 3 and 4 so pi + pi/3 = 4 pi/3 and 2 pi - pi/3 = 5 pi/3

**Calculus**

symmetric around x = 0 so do it from x = 0 to x = 3, then double. crash into each other at x = 2 so do it from x = 0 to x = 2 then from x = 2 to x = 3 add, then double integral (8-2x^2)dx from 0 to 2 8x - (2/3)x^3 at 2 - at 0 16 -16/3 integral from 2 to 3 (2 x^2 - 8) dx (2/3)x...

**Calculus**

Find the area of the region between the curves y=8?x^2 y=x^2 x=?3 and x=3 I made a slight correction

**Calculus**

Find the area of the region between the curves y=8?x2 y=x2 x=?3 and x=3

**Science **

The closer together magnetic field lines are, the The magnetic force A closer B farther C stronger D weaker

**history**

I bet you know #8 without even reading the chapter :)

**no way**

I already took the course and do not need practice. The idea is you try and we try to help if you get stuck.

**math help**

Just like compound interest :)

**ah, unlikely**

If anyone here knows what is on your test they are not telling.

**maths**

32 (t + 2)= d 52 t = d so 32 t + 64 = 52 t 20 t = 64 t = 3.2 hours and 12 minutes ========================== check 32 * 5.2 = 166.4 52 * 3.2 = 166.4 good

**math**

y = m x + b 295 = m * 7 + b 155 = m * 3 + b ------------------subtract 140 = 4 m m = 35 so y = 35 x + b now put a point in 155 = 35(3) + b b = 155 - 105 b = 50 so y = 35 x + 50

**math**

For 1 i meant B not D sorry

**math**

1. which ratio form a proportion? 4/9, 12/25 3/7, 18/42 5/11, 20/45 5/8, 15/25 2. which ratio forms a proportion with 18/30? 20/35 50/90 36/48 60/100 ~MY ANSWERS~ 1. D 2. I don't know this one can someone help me please. I have tried for over 30 minutes on this.

**Physics**

humm, is it sliding or rolling? If rolling then some of that potential energy goes into kinetic at the bottom Ke = (1/2) m v^2 + (1/2) I omega^2 I = (2/5)mr^2 for solid ball so Ke = (1/2)mv^2 + (1/2)(2/5)mr^2 omega^2 but v = r omega so Ke = (7/10)mv^2 so 9.8*.45 = .7 v^2 by ...

**math**

A cyclist took 3 1/3 hours to cover 46 km. For the first 30 km, he cycled at 15 km/h. Find his speed for the last part of the journey.

**science**

Which sequence shows the correct order of Earth’s geologic time intervals from oldest to youngest?

**Math**

Don bats in 9 cricket matches. In the tenth match, he makes 9 runs and his average decreases by two. How many runs has he made in all?

**Algebra**

right triangle with hypotenuse = diagonal x^2 + (x-7)^2 = (x+7)^2 x^2 + x^2 - 14 x + 49 = x^2 +14 x + 49 x^2 -28 x = 0 = x(x-28) x = 0 or x = 28 so 28 by 21 ----------------------- try that length = diagonal^2 = 28^2 + 21^2 = 784 + 411 = 1225 so diagonal = sqrt(1225) = 35 yes...

**Math**

correct

**Math Help**

yes

**PHYSICS incomplete question**

incomplete need ratio of mass of Venus/mass of earth If the radius is the same then the g is proportional to the mass of the planet

**mathis this a right triangle?**

If DF is the hypotenuse then DE = EF = 16/sqrt 2 = 16 sqrt 2 / 2 = 8 sqrt 2 If FE is the hypotenuse then FD=DE = 16

**math**

well, it is a little tricky 6 x^2 + 5 x = 4 to get something on your list you subtract 4 from both sides. I get x = 1/2 or x = 4/3

**Physics (Mirror Rays)**

The focal point is halfway between the surface of the mirror and the center of the circle.

**Math**

Two automobiles leave an intersection at the same time. One of them travels west and the other travels south. When the vehicle going south has traveled 24 miles, the distance between the cars was four miles more than 3 times the distance traveled by the vehicle traveling west...

**math**

Factorise: 4x^2-9y^2+2x-3y

**college algebra**

The current in a simple electrical circuit is inversely proportional to the resistance. If the current is 80 amps when the resistance is 30 ohms, find the current when the resistance is 12 ohms

**college algebra**

A. 3units B. 0units

**college algebra**

23. In biology, the function defined by g(x)=5x/2+x gives the growth rate of a population for x units of available food. (Source: Smith, J. Maynard, Models in Ecology, Cambridge University Press.) (a) What amount of food (in appropriate units) would produce a growth rate of 3 ...

**college algebra**

Biologists collected a sample of 600 fish from West Okoboji Lake on May 1 and tagged each of them. When they returned on June 1, a new sample of 800 fish was collected and 10 of these had been previously tagged. Use this experiment to determine the approximate fish population ...

**Physics 11**

I assume that you are talking about one rigid body. Work input is basically the force times the displacement in the direction of the force. You can have more than one force acting on a body but if so, combine (add) them and only use the component in the direction of motion. I ...

**Chemistry**

correction to first line Fe3O4 not Fe ---------------------- You need 4 mols of CO for every 1 mol of Fe3O4 4 * .03820 = .153 so we need .153 mols of CO BUT we only have .120 mols of CO so the CO limits or controls the reaction so we actually use .120/4 = .0300 mols of Fe3O4 ...

**Chemistry**

You need 4 mols of CO for every 1 mol of Fe 4 * .03820 = .153 so we need .153 mols of CO BUT we only have .120 mols of CO so the CO limits or controls the reaction so we actually use .120/4 = .0300 mols of Fe3O4 that means we have .0300 *3 mols of Fe = .0900 mols Fe on each ...

**world geography**

shipbreakers wreck old ships in order to

**math**

39-35.10 = x 100(x/35.10) = answer

**Math**

You are welcome.

**Math**

I guess you want with respect to x 3 x^2 dx/dx + 2 y dy/dx = 27x dy/dx + 27 y dx/dx but dx/dx = 1 as you know so 3 x^2 - 27 y = (27 x - 2 y )dy/dx so dy/dx = (3x^2-27y)/(27x-2y)

**math**

.75 * .75 * 256 .75*.75 = .5625 = 56.25 % .5625 * 256 = 144 or 3/4 * 3/4 = 9/16 and 9/16* 256 = 9*16 = 144

**math**

twice = 100 % increase three times = 200 % increase etc ten times = 900% increase or 1000 % of original is 900% increase:)

**physics**

c * (T-24)(500) = c *(84-T)(750)

**physical science**

Google meniscus surface tension

**physical science **

Why does liquid substance have the same meniscus shape

**Fractions**

There are animals on the farm half are pigs one fifth are sheep what fraction are cows