Friday

December 9, 2016
Total # Posts: 103,250

**Statistics**

Suppose that 30% of all college students smoke cigarettes. A sample of 18 is selected randomly. What is the probability that exactly 10 students smoke? Round your answer to four decimal places.

*November 6, 2016*

**Physics**

I just want to see if I got the step by step and answer right

*November 6, 2016*

**Physics **

A 10 kg object (m1) initially moving to the right at 20 m/s makes a totally elastic head on collision with a 15 kg object (m2) which was initially moving to the left at 5 m/s. Find the final velocities of each object. HINT: Treat this as a one-dimensional problem. Help ASAP ...

*November 6, 2016*

**Physics**

What equation to use and how to substitute it into the equation

*November 6, 2016*

**Physics **

Two cars approach along icy streets which meet at a right angle to one another. The cars collide and stick together. One car has a mass of 1200 kg and had a speed of 30 km/h in the +x direction before the collision. The second car has a mass of 1500 kg and was traveling in the...

*November 6, 2016*

**Physics**

Never mind I got it

*November 6, 2016*

**Physics**

I still don't get it. Can you show me the equation with the numbers plugged into it please

*November 6, 2016*

**Physics **

Three carts of masses 4kg, 10 kg, and 3 kg move on a frictionless horizontal surface with initial speeds of 5 m/s, 3 m/s, and 4 m/s. If the carts all stick together after the collisions, what will be the final velocity of the combined mass? Help ASAP please. Step by step to ...

*November 6, 2016*

**Physics**

I just want to see if I got the step by step correct

*November 6, 2016*

**Physics **

Show that the kinetic energy of an object can be written in terms of the momentum as KE = p2/2m. Help ASAP please. Step by step to get the answer

*November 6, 2016*

**Physics**

Where did 9 and 16 come from??

*November 6, 2016*

**Physics **

a) What is the ratio of the momentum of a 3kg mass moving at 3 m/s to that of a 2 kg mass moving at 4 m/s? b) What is the ratio of the respective kinetic energies? Help ASAP please!! Step by step to get the answers

*November 6, 2016*

**College Alg**

Related Questions math - A couple plans to save for their child’s college education. What ... math - A couple plans to invest money for the chld's education. What principle ... math college - A bank account earns 10 percent interest compounded continously. ... Finance...

*November 6, 2016*

**history**

Which of these contributed most to white settlers' desire to have the Seminole tribe removed from Florida? a. Seminole attacks on small farms b. A Seminole alliance with the Spanish c. The Seminoles' control of the fur trade d. The Seminoles' protection of runaway ...

*November 6, 2016*

**algebra**

Write an equation that can be used to find two consecutive integers such that the sum of their reciprocals is 13 84

*November 6, 2016*

**math **

A rectangular parking has a perimeter of 28 units. The length is six less than double the width. What is the length of the parking lot?

*November 6, 2016*

**Philosophy**

john will either not other..... sorry about the typo. I know the claim is acceptable by observation i just want to know if it is unacceptable by any way or no. Thanks

*November 6, 2016*

**Philosophy**

john will other score 10/10 on the assignment or he will not This claim is acceptable by observation, could we also say that it is unacceptable by problems in language (vagueness). Or is there any other way it is unacceptable

*November 6, 2016*

**Math**

6+2x=24 2x=24-6 2x=18 x=18/2 x=9

*November 6, 2016*

**Math**

6+2x=24 2x=24-6 2x=18 x=18/2 x=9

*November 6, 2016*

**math**

A regular polygon is inscribed in a circle of radius 9 cm. Calculate the perimeter of the polygon to the nearest tenth if the polygon has 6 sides.

*November 6, 2016*

**math**

A regular polygon is inscribed in a circle of radius 11 cm. Calculate the perimeter of the polygon to the nearest tenth if the polygon has 8 sides.

*November 6, 2016*

**math**

A ship leaves port at 7 am and heads due east at 34 knots. At 10 am, to avoid a storm the ship changes course to N 57° east of north). Find the ships distance from port at 2 pm. Round to the nearest tenth. To determine nautical miles multiply the speed in knots by the ...

*November 6, 2016*

**math**

When an airplane leaves the runway, its angle of ascent is 13° with a speed of 82 metres per second. Find the altitude of the plane after 7 minutes.

*November 6, 2016*

**math**

A pilot is asked to approach the airport at an 6° angle of descent. If the plane is travelling at an altitude of 27000 ft, at what horizontal distance from the airport should the descent begin? Give your answer to the nearest foot. Your Answer:

*November 6, 2016*

**trig**

A communication tower is 34m tall. Jane stands somewhere in front of the tower to the right and measures the angle of elevation to be 70 degrees. Bill stands somewhere in front of the tower to the left and measures the angle of elevation to be 50 degrees. How far apart are ...

*November 6, 2016*

**math **

Ali swims 4m for every 1m Anton swims. By how far in meters will Ali beat Anton if the race is 50m?

*November 6, 2016*

**chemistry**

The atomic mass of an element is 27.and its equivalent mass is 9.the vapour density of chloride is

*November 6, 2016*

**maths**

how to solve this equations 2x=3x

*November 5, 2016*

**Algebra 2**

Thanks Steve

*November 5, 2016*

**Algebra 2**

Yes

*November 5, 2016*

**Algebra 2**

Given: log(10,5)=a, log(10,3)=b, log(10,2)=c Find: log(30,8)

*November 5, 2016*

**geography**

A football match is to be played on Saturday in NewZealand(longitude 150 degrees east) between the host country and Nigeria (longitude 15 degrees east).If the match is to be televised life, at what time should Nigerians tune in their television sets to watch the kickoff ...

*November 5, 2016*

**geography**

If the time at Town A longitude 75 degrees west is 5 p.m. on Friday what will be the time at Town B longitude 120 degrees east

*November 5, 2016*

**geography**

Sorry.It's 120 degrees east

*November 5, 2016*

**geography**

If the time at town A (longitude 75 degrees west) is 5.00pm on Friday,what will be the time and day at town B?

*November 5, 2016*

**chem.**

A mixture of gases contains twice as many moles of As as Kr. If 0.300 mol of Xe is added to this mixture, the pressure increases from 1.26 atm to 1.47 atm. how many moles of Ar are in the mixture?

*November 5, 2016*

**physics (urgent)**

average rpm during halt = 50 rev/min time to halt = 10 rev/50 rev/min = .2 min or 12 seconds omega at start = 100 rev/min*2pi rad/rev * 1 min/60s = 100 *2pi/60 radians/second so alpha = d omega/dt = - 10pi/3 / 12 radians/s^2 and Torque = I * alpha

*November 5, 2016*

**PHYSICS**

average speed = 30 time to stop = t = d/30 -mu m g = m a a = -10 mu = - 5 m/s^2 v = 60 + a T 0 = 60 -5 t t = 12 seconds to stop then d = 60 (12) - (1/2)(5)(144) d = 5 (144) - 2.5(144) d = 2.5 * 144

*November 5, 2016*

**Physics**

(a) Av = v^2/r = 9/2 (b) (1/2) m v^2 (c) distance = 2 pi r time = distance / v (d) omega = v/r Hey, this is all in your text easy.

*November 5, 2016*

**Physics - Gravitation**

find potential and kinetic energy of each orbit and subtract.

*November 5, 2016*

**Physics Gravitation Question**

I did part A) below B) g = v^2/R 2 pi R = v T so v = 2 pi R/T

*November 5, 2016*

**Physics Gravitation Question**

g = G M/R^2 here R = 525,000 meters M = 2.59*10^20 G = 6.67 * 10^-11 for part 2 calculus helps dg/dr = -2R G M /R^4 so dg = -2 G M/R^3 dr dg/g = -2 G M/R^3 (R^2/GM) dr dg/g = -2 dR/R here dR/R = 22/525

*November 5, 2016*

**sir-reiny-steve help **

In a survey carried out among 100 soldiers, the investigation shows that 42 were shot on head, 43 on arm, 32 on leg, 5 were shot on head and arm, 8 on arm and leg and 6 on leg and head. How many soldiers were shot; (i). all three parts of the body. Plz help

*November 5, 2016*

**Physics**

Initial x momentum = 2.5 u Initial y momentum = 0 Final x momentum = 2.5 V cos 22 + 4.9 (15) cos 37 Final y momentum = 2.5 V sin 22 - 4.9(15)sin 37 SO use final y momentum = 0 to get velocity of particle 2 4.9(15) sin 37 = 2.5 V sin 22 then go back and use the x momentum to ...

*November 5, 2016*

**Physics**

No one said energy was conserved!!!! Momentum is conserved in the x direction AND Momentum is conserved in the y direction

*November 5, 2016*

**Math**

All my pairs of underpants are red except two. All my pairs of underpants are blue except two. All my pairs of underpants are pink except two. How many pairs of underpants do I have?

*November 5, 2016*

**Adv function**

Cos^4(x)+sin^4(4)=cos(2x) Plz help.

*November 5, 2016*

**math**

Two trains leave the station at the same time, one heading west and the other east. The westbound train travels 10 miles per hour slower than the eastbound train. If the two trains are 720 miles apart after 4 hours, what is the rate of the westbound train?

*November 5, 2016*

**Adv function**

(2-sin^2x)/-sinx=sinx Is this doable. That's the answer but I can't get the l.s to equal r.s

*November 4, 2016*

**Calculus Reimann Sum**

Approximate ?_-2^3(x+3)dx via the Riemann sum. Use the partition of five subintervals (of equal length), with the sample point barx_i being the right end point of the i-th interval. I attempted this problem and got -40/3, but it's not being accepted. I'm not sure what ...

*November 4, 2016*

**spanish**

Question 2 is C then right?

*November 4, 2016*

**Help please spanish**

please correct me if I am wrong

*November 4, 2016*

**spanish**

am i right?!

*November 4, 2016*

**spanish**

my answers: C A B

*November 4, 2016*

**spanish**

How do people in the Spanish speaking world invite people to their parties? A) Formal, written invitations B) Posting the celebration in the newspaper well in advance C) Verbally without much notice Which of the following is not true about Barcelona? A) It is the capital of ...

*November 4, 2016*

**Chemistry**

N2(g) + 3H2(g) -> 2NH3(g) How many grams of ammonia are formed from 14.0 grams of nitrogen? 14/2 = 7 grams of ammonia

*November 4, 2016*

**social studies**

Is it B?

*November 4, 2016*

**ss**

Since Greenwich, England is on the prime meridian, which of the following is a line of longitude that would be found in North America? a. 45Ã‚Â° N c. 30Ã‚Â° S b. 70Ã‚Â° E d. 100Ã‚Â° W

*November 4, 2016*

**Math**

Davis High School Multi-Step The heights of the starting players for the and 69 in. Find the team are 78 in., 74 in., 71 in., 7o in., Boys basketball average height of the starting players.

*November 4, 2016*

**help help help sir steve**

find 16^1/3 without the use of calculator plzzzz help i dont know it

*November 4, 2016*

**Algebra 2**

Consider the graph of f(x)=2[[x/3]] +4 with doman {x|0<_x<12}. Create the piecewise function that would produce the same graph over the indicated domain. [[ ]] stands for a step function

*November 4, 2016*

**physics **

A small disk of radius r is glued onto a large disk of radius R that is mounted on a fixed axle through its center. the combined moment of inertia of the disks is I. A string is wrapped around the edge of the small disk and a box of mass m is tied to the end of the string. the...

*November 3, 2016*

**Adv function**

sin(7x)= sin(x)[cos^2(3x)-sin^2(3x)]+2cos(x)cos(3x)sin(3x) I tried for an hour but still don't know how. Plzz help

*November 3, 2016*

**Ad. Functions**

write 2sin(2x)+(rt12)cos(2x) in the form of y= Acos(2x-theta) by finding A>0 and theta is a real number between [0, 2pi] I found that a=2 and theta =pi/2. But I don't think that's right

*November 3, 2016*

**Health **

Why is it important to eat a variety of foods?

*November 3, 2016*

**Math**

( 7.5x10^11 ) - ( 4.3x10^8 )

*November 3, 2016*

**Math**

5d=(445-120) d=1/5(445-120)

*November 3, 2016*

**Physics**

A mass is tied to a 1 m string. The string is attached to a point on a horizontal frictionless surface and the mass is set into circular motion. The string will break if tension becomes larger than 10 N. The maximum kinetic energy that the mass can achieve before the string ...

*November 3, 2016*

**Math **

|-3| , -3 what is the difference between the two

*November 3, 2016*

**maths help**

A binomial expansion is such that (p + x)^n = 3q + 6qx + 5qx² + .. If p ? 0, find the values of p, q and n plz show step

*November 3, 2016*

**Math**

Mrs. Miller is planning a vacation overseas. She knows that fuel is sold in liters in other countries. She wants to become familiar with this measure of volume. Mrs. Miller just purchased 14 gallons of fuel for her car. About how many liters is this?

*November 3, 2016*

**Chemistry**

y2-y1 x2-x1 40×40-40=40

*November 3, 2016*

**Calculus**

If f(x) = 2xsqrt(x-6), what is the value of (f^-1)(40)?

*November 2, 2016*

**math**

bjbjhh

*November 2, 2016*

**chem**

Consider the isotope arsenic-76 How many protons are in an atom of this isotope? 33 What is the mass number of this isotope? 76 How many neutrons are in an atom of this isotope? 43 What is the atomic number of this isotope? 33 Give the nuclear symol 76/33 As How many electrons...

*November 2, 2016*

**Algebra 2**

-b +/- square root of b^2 -4ac all divided by 2a 4 +- sq rt(16-4(1)(-1)) divided by 2 4 +- sq rt (16 +4) divided by 2 4+- sq rt(20) divided by 2 4+/- 2 sqrt 5 divided by 2 2+sqrt 5 or 2-sqrt 5 = x

*November 2, 2016*

**Math**

19 2/3 + x + x = 113 1/3 2x = 93 2/3 x = 46 5/6

*November 2, 2016*

**Adv function**

Express sec2x in terms of tanx and secx I know you have to sec(2x) = 1/cos(2x) = 1/(cos²x - sin²x) But how do you split that. Like how to simplify that?

*November 2, 2016*

**algbra**

You have a full time job at a clothing store that pays a base rate of $13 per hour, with time-and-a-half for hours over forty in a week. You also earn a 2% commission on your total sales for the pay period. You are paid biweekly. You have determined that the withholding amount...

*November 2, 2016*

**Math HELP!!**

good job

*November 2, 2016*

**Math**

Your mom ooooooooooooohhhhhhhhhhhhh

*November 2, 2016*

**Math**

4/5 x 100 = 80 shaded

*November 2, 2016*

**statistics**

Despite he outrageous incomes of some, the mean income of all aging rock stars is relatively modest: $75,000 with a standard deviation of $2,000. On that scale, Chubby Checker, appears to do better than average: at most, only 6.25% of aging rockers make more than he does. what...

*November 2, 2016*

**algebra 2**

f(x) = -4x + 7 and g(x) = 2x - 6.

*November 2, 2016*

**Calculus **

Find the particular solution that satisfies the differential equation and the initial conditions. F'(x) = 4x^2 f (-1)=3 F'(t)=10t-12t^3 f (3)=2

*November 2, 2016*

**physics**

Two buses leave a bus station and travel in opposite direction from the same standing point.if the speed of one is twice the other and they are 240km apart at the end of one hour. What is the speed of each km

*November 2, 2016*

**Chemistry**

How much heat is required to convert solid ice with a mass of 810 g and at a temperature of -18.0 °C to liquid water at a temperature of 62.5 °C? (The specific heat of ice is cice = 2100 J/kgK, the specific heat of water is cwater = 4186.8 J/kgK, and the heat of fusion...

*November 2, 2016*

**maths steve reiny**

Sqrt(x)^sqrt(x)=2 show solution step that all i need thanks

*November 2, 2016*

**Math, Precalc**

3^x + 5^(x+3) - 3^(x+4) + (1/3)5^(x+2)= 0 3^x(1 - 3^4) + 5^(x+2)(5 + (1/3)(1) ) = 0 -80(3^x) + (16/3)(5^(x+2) = 0 times -3/16 15(3^x) - 5^(x+2) = 0 15(3^x) = 5^(x+2) divide by 5 3(3^x) = 5^(x+1) 3^(x+1) = 5^(x+1) this can only be true if x = -1 that is, if 3^0 = 5^0 , which is...

*November 2, 2016*

**Math, Precalc**

Sue's time riding the bike = 5/15 hrs = 1/3 hr Sue's time walking the 2 miles = 2/3 hr total time = 2/3 + 1/3 = 1 hr total distance = 7 miles average speed = 7/1 = 7 mph

*November 2, 2016*

**Gaussian Elimination Method**

Write the system of equations as an augmented matrix ?????u=150?7s+4m=25019s?11m=300

*November 2, 2016*

**SS Check Answers**

did you mean 1967 or 1965?

*November 2, 2016*

**Texas History**

Answer please!!!!!!!!!!!!!!

*November 2, 2016*

**Texas History**

What is the answer?

*November 2, 2016*

**Texas History**

I am reading my book about this stuff but it is hard to find the answer for this. I need at least 4 sentences about this.

*November 2, 2016*

**Texas History**

Explain how the fall of the Alamo and the Goliad Massacre both hurt and helped the Texans' quest for independence in the Texas revolution. (4 pts)

*November 2, 2016*

**counseling**

stanford-binet

*November 2, 2016*

**Maths**

A metere long strip is cut into 12 equal pieces. What is the length of each pieces

*November 2, 2016*