# Posts by Anonymous

Total # Posts: 108,948

**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

**politics**

D for sure

**math**

.35 * 20 = 7 liters in there now .65 * 20 = 13 is what we want so put in 13 - 7 liters

**chemistry**

A hot lump of 46.9 g of copper at an initial temperature of 54.5 Ã‚Â°C is placed in 50.0 mL of H2O initially at 25.0 Ã‚Â°C and allowed to reach thermal equilibrium. What is the final temperature of the copper and water given that the...

**Math**

2.5 (10 - .4) = 25 - 1 = 24

**Maths**

A 5 metre tall vertical pole is supported by a guy wire. The wire is attached to the top of the pole and is attached to the ground 3 metres from the base of the pole

**physics**

DRAW IT !!!! east: 500 + 75 north: 1015 - 320

**physics**

wind is from SW That means it is pushing you NE NE is 45 degrees east of north (halfway between north which is 0 and east which is 90) DRAW THE PICTURE !!!!

**physics**

by the way I unintentionally used the fact the sin 45 = cos 45 = sqrt2/2

**physics**

A is heading angle west of north Wind is taking us NE at 70 North speed over ground = 100 cos A + 70 cos 45 West speed over ground = 100 sin A - 70 cos 45 if we are making a course made good of north, west speed is 0 so sin A = (70 /100)cos 45 A = 29.7 degrees west of North ...

**math**

You sail on a HEADING, not a bearing. You take a compass bearing on something else as in P from R Q: sailed on a heading of 150 which is 30 degrees east of south (draw that) we will use the law of cosines RQ = 10 RP = 8 QP = 12 we want first the angle call it x opposite QP QP^...

**science**

let me see one is magnetic and another one dissolves in water

**science **

Describe how you would separate a mixture of sand, iron fillings and granulated sugar

**Physical science**

Some of those are elements in the periodic table or chemical compounds such as NaCl or Fe. Others are combinations of different materials. For example a rock may have several types of mineral in it. Now you try to figure out which is which.

**Math**

to go into detail: 78/12 + 32/12 = 110/12 78/12 - 32/12 = 46/12 so what we really have is 110/46 = 55/23

**calculus**

(5x)^2/2 / 5x = 2.5 x

**calculus**

Hey, get used to this cos u --> 1 - u^2/2! + ..... routine and the e^u --> 1 as u---> 0 Both of your problems are the same.

**math**

Smita and Geeta have marbles in the ratio 3:2.Geeta and Reshma have marbles in the ratio 3:5.if they have 250 marbles all together,how many marbles does Smita have???

**math**

The cost of 3 bananas 4 apples and 6 mangoes is rs.29 and the cost of 2 bananas 6 apples and 3 mangoes is rs.23.what is the cost of 7 bananas 16 apples and 12 mangoes???

**Science**

Total volume of solution: = 40 cc + 50 cc = 90 cc Concentration of alcohohol: = (volume of alcohol / total volume) × 100% = _____ % alcohol

**Electives**

What do you do in an Interpersonal Studies class?

**Maths**

total area = 4 m^2 one tile is 0.2*0.2 = 0.04 m^2 per tile so 4/.04 = 100 tiles 100 tiles * 2 dollars/tile = 200 dollars

**Science**

2. is wrong 4. is wrong 6. not sure but I would have picked fossil fuel 7, VERY wrong 11. NO ! c 13. exactly wrong! Coal spews junk out smokestacks.

**Accounting**

1) What does the accounting profession has to offer (besides salary) 2) What are some facts/enticing details about the accounting profession? 3) How do you earn a Cpa designation for it? I tried looking it up but can't find a layout.

**math**

The ratio of Toby's salary to George's salary is 13:8. The ratio of George's salary to Bill's salary is 2:3. Find the ratio of Toby's salary to Bill's salary, and Bill's salary to total salary.

**science**

A bottle full of water has mass of 100g. when the same bottle is filled with luquid X, its mass is found to be 80g.If the mass of an empty bottle is 50g, calculate the density of the liquid?

**math**

Ali has an assortment of coins and notes in his money box. He has nine times as many $1 coins as $5 notes, while there are eight times as many $2 coins as $5 notes. After counting his money Ali discovered that he had exactly $90. How many $2 coins, did he have?

**physics**

A 15.0 m, 500 N uniform ladder rests against a frictionless wall, making an angle of 60 0 with the horizontal, as shown in Figure Q3(a). Draw the free body diagram and calculate the normal force FN exerted by the wall, horizontal FBI and vertical Fv forces exerted on the base ...

**civics banking**

I think it is D then because you don't want to increase the rate.

**civics banking**

The Federal Reserve has a number of ways to influence the supply of money. The Federal Reserve can influence the interest rate that people pay on their loans, regardless of what bank they are using. How might the Fed adjust the interest rate if it wanted to increase the amount...

**civics**

C is keep a portion of the money deposited available to account holders. That is right?

**civics**

C. Keep a portion of the money deposited available to account holders

**civics**

C is my final answer

**civics**

C. Keep a portion of the money deposited available to account holders D. Lend money to people regardless of how likely they are to pay it back I fixed it

**civics**

I think it is C

**civics**

Which of the following is a bank required to do in the United States? A. Avoid lending money to people who want to start a business B. Invest money in the stock market Keep a portion of the money deposited available to account holders C. Lend money to people regardless of how ...

**math**

please proofread. time outward = d / 18 time back = d/20 total time = d/18 + d/20 total distance = 2 d av speed = 2 d/ [d/18 + d/20] = 2/(1/18 +1/20) = 2/(.056+.05) = 2/.106 = 18.9 km/h

**Math**

(x)/(x-2)+(x-1)/(x+1)=-1 Can someone help me with this?

**math**

Consider the pattern: 11 - 2 = 3^2 1111 - 22 = 33^2 111111 - 222 = 333^2 ..... x - y = 33,333,333^2 Find the values of x and y.

**Calculus**

The base of a solid is a region located in quadrant 1 that is bounded by the axes, the graph of y = x^2 - 1, and the line x = 2. If cross-sections perpendicular to the x-axis are squares, what would be the volume of this solid?

**Chemistry**

Would you do moles/molar mass to find the grams?

**Chemistry**

Calculate the mass of Fe(NH4)2(SO4)2.6H2O(s) required to prepare 25ml of 1.0 M Fe(NH4)2(SO4)2.6H20(aq)

**math**

on a scale drawing, the length of a plane is 45 cm. The actual length of the plane is 90 m. What is the scale used?

**You need diagram**

Maybe you tries to copy and paste the figure but that does not work here. You need the trig to get the vector components.

**Physic **

Three uniform spheres of masses m1 = 3.50 kg, m2 = 4.00 kg, and m3 = 5.50 kg are placed at the corners of a right triangle (see figure below). Calculate the resultant gravitational force on the object of mass m2, assuming the spheres are isolated from the rest of the Universe.

**Math**

cool ,never would have thought to do it that way:) red + (1/4) red = 75 (5/4) red = 75 red = 60

**Math**

You are welcome.

**Math**

hmmm, note that 8 = average width 5+11 = 16 and 16/2 = 8 I bet you just have 8*4 = 32

**Math**

LOL, too many, three numbers not 4 b1 = b2 = h = then calculate area A

**Math**

note that (1/2)(b1+b2) is the average width of the trapezoid so you are really multiplying the height times the average width

**Math**

Well, Google that area of a trapezoid and you will find your formula and how to do it.

**Math**

If you Google area of a trapezoid you will find an online calculator :)

**Math**

base and top of a trapezoid of height h ?

**Math**

You are welcome.

**Math**

at midnight it was -20 - 8 = -28 by the way at 8 am it was -28+12 = -16

**Math**

same with common denominator 3/24 , 6/24 , 16/24 , 12/24 , 24/24 if you want them in ascending order 3/24 , 6/24 , 12/24 , 16/24 , 24/24

**Calculus**

I suppose you could have the function jump up or down at x = 6 and have the same slope of -6 on both sides of the jump, but that is a bit of a stretch.

**Calculus**

I agree :)

**Calculus**

Isn't #2 also supposed to be true? I thought f(x) had to be continuous at the point at which we find the derivative.

**Calculus**

that is the very definition of the derivative of f(x) at x = 6 so it exists, it is -2 the function is contiuous because it has a unique slope at 6 All I know is that the SLOPE is negative 2 at x = 6. I do NOT KNOW if the function is +, - or 0

**Calculus**

Given that the limit as h approaches 0 of (f(6 + h) - f(6))/h = -2, which of these statements must be true? 1. f'(6) exists 2. f(x) is continuous at x=6 3. f(6) < 0

**Math**

well, the distance from center to corner by that definition is 6 sqrt 2 so the diagonal of the square is 12 sqrt 2 so the side of the square is 12 so the area is 144

**Math**

I have a hunch that you mean a circle, not a square. Squares do not have radii. If so: A = pi r^2 = (22/7)(36)(2) about 6*36 or 216 On the other hand if it is a square with side (not radius) = 6 sqrt 2 then 36*2 = 72 so B

**math**

find the probability of spinning each of the following p (7) 1/7* 1/8 3/8 7/8 P(not 7) 1/7 1/8 5/8 7/8 P(a multiple of 2) 0.25 0.5 0.625 0.75 which event has the greatest likelihood spinning 7 spinning not 7 spinning a multiply of 2 spinning a factor of 12

**social studies**

Jimmy carter held all of the following political offices except?

**chemistrey**

an ocean depth of 10.0 m, a drivers lung capacity is 2.40 l. the air temperture is 32.0n c and the pressure is 101.30 kpa.what is the volume of the drivers lungs at the same depth, at a temp of 21.0c and a pressure of 141.20 kpa?

**maths**

Maybe she read chapter one over and over?

**Algebra 2**

In this problem a = 13 d = -2 now what is n? 13 + k(-2) = -25 -2 k = - 38 k = 19 for the last term so n-1 = 19 n = 20 so we have (20/2)[26 +19(-2)]

**Algebra 2a+kd**

well, in general for arithmetic sequence sum from k = 0 to k = n-1 of a+kd is (n/2)[ 2a+(n-1)d ]

**Physics**

.456 [ 4186(25-0) + 335,000 + 2090(0+10) ]

**Physics**

15)A small ball of mass m is aligned above a larger ball of mass M = 1.2 kg (with a slight separation, as with the baseball and basketball of Figure (a)), and the two are dropped simultaneously from height h = 2.4 m. (Assume the radius of each ball is negligible compared to h...

**Physics**

What is the weight of an object that has a base which is 3 square cm and which exerts a pressure of 21 kg per square meter?

**Photojournalism**

So would we actually take photos in the class?

**Photojournalism**

What exactly is Photojournalism? Of course I have googled it but I don't exactly have a good idea of how it would be like as a high school class? Does anyone have an idea on what we would be doing in that class?

**Calculus**

Use the Comparison Theorem to determine whether the following integral is convergent or divergent. S= integral sign b=infinity and a=1 S(9(cosx^2))/ (1+x^2) dx

**Physics**

two blocks aA and B are placed as in figure, and connected by ropes to block C. Blocks A and B weigh 20 N each and the coefficient of kinetic friction between each block and surface is .40. Block C descends with an acceleration of 2 m/s2... A. Find the tension in the ropes B. ...

**math**

The volume of two similar rectangular prisms are 64cm^3 and 1000cm^3. The surface area of the smaller figure is 112cm^2. What is the surface area in square centimeters of the

**Social Studies**

Thanks Ms. Sue I'll go ahead and look throw my text book on that one.

**Social Studies**

Which resource makes up a quarter of Chile's exports? A:Fruit B:Fish C:Copper*** D:Silver Chilean produce is free of many common plant pests because most farming regions are protected by? A:Atacama Desert*** B:Andes Mountains C:Amazon River D:Strait of Magellan Although ...

**chemistry**

Lab: Determining the Quantity of Vitamin C in Fruit Juice Vitamin C, also called ascorbic acid, is commonly found in commercial fruit juices and drinks. In this activity you will analyze data collected from a titration analysis of a fruit juice. The nutrition facts for a 200-...