# Posts by samuel

Total # Posts: 274

**statistics **

a survey from teeneage research unlimited found that 30% of teenage consumers receive their spending money from parttime jobs. If 5 teenagers are selected at random, find the probability that at least 3 of them have part time jobs

**Algebra**

1/3 of a number is added to 5. the result is one and half times the original number.find the number.

**further maths**

given that p=i+j-2k and q=2i-j+2k.find two vectors m and n satisfying that m is perpendicular to p,n is parallel to p and m+n=q

**Surds**

Write (2+3^1/2)^1/2 in the form root a plus root b ..and find a and b

**Math**

Austin pays $1.50 per day for high speed internet after paying the equipment fee of $35.00. Identify the constant of proportionality that relates his internet charges (y) to the number of days (x) he has internet.

**physics**

(1) a car travelling at a constant speed of 20ms-1 overcomes a constant frictional resistance of 300N. What is the horse power of the engine? ( take 1h.p = 3/4 kw)

**Physics**

A tennis ball is thrown with a velocity of 30m/s at an angle of 60^ of the horizontal calculate the time,m/s,and the range

**English Beowulf**

Thank you! Yes I need to narrow it down. This professor gets on my nerves.

**English Beowulf**

How did the culture of Beowulf view pride? Why?

**Physics**

The density of copper is 9.8 kilograms per meter cube and the density of gold is 1.9 kilograms per meter cube. When two wires of these metals are held under the same tension, the wave speed in the gold is found to be half that in the copper wire. What is the ratio of the ...

**maths sir-reiny help calculus**

solve the differential equation (x^2-xy+y^2)dy-xydx=0 plz show me working

**calculus help me pllllllllllz**

so what do i do from here now sir

**calculus help me pllllllllllz**

Find out what kind of improper integral is given below §dx/{x^4+4}....?,hence evaluate the integral with upper boundary=infinity lower boundary =0 i need help plz show me full work

**maths need help**

the transverse of the conic:3x^2-y^2+2y-1=0 is ???

**science**

A concave lens or focal lens 10cm produce an erect image 40cm from the lens .Determine the object distance and magnification.

**Probability**

Find the probability that a committee of 10 people chosen from an organization consisting of 40 doctors and 35 dentists will include 3 doctors and 7 dentist. 40c10 + 35c10 not sure what to do after setting it up. Need help

**Chemistry**

In the zinc-copper cell, Zn(s) | Zn^+2(1M) || Cu^+2(1M) | Cu(s), which electrode is negative? Cu^+2 Cu(s) Zn(s)*** Zn^+2

**Chemistry**

What is the oxidation half reaction for the following equation: Cr2O7^-2 +Fe+2 - - > Cr^+3 + Fe^+3 Cr^+3 - - > Cr2O7^-2 Fe^+2 - - > Fe^+3 Fe^+3 - - > Fe^+2 Cr2O7^-2 - -> Cr^+3***

**Chemistry**

What is the reducing agent in the following reaction? 2K + S - - > K2S K*** S K2S None of these

**physics**

A piece of copper of mass 40 grams at 20 degrees Celsius is placed in a copper calorimeter of mass 60 grams containing 50 grams of water at 10 degrees Celsius .ignoring heat losses,what will be the final steady temperature after stirring?(specific heat capacity of copper and ...

**calculus-help.. .Me**

if y=e^(-kt)[Acosh(qt)+Bsinh(qt)] where A,B,q and k are constant show that d^2y/dt^2+2kdy/dt+(k^2-q^2)y=0 step plz thanks

**expansion help**

find the series of the expansion (1+(1/x^3)) help!!!!

**physic**

Two forces of magnitude 4.ON ans 7.0N act on a small object b. The angle btw the direction along which the force is 50 degree.determine the magnitude *nd direction of d resultant force on d body b.

**physic**

Two forces 5N and 10N act on a body in the direction due North and east respectively at an angle 75 degree. Calculate the resultant force of the inclined angle.

**chemistry**

what will haprn if ammonium chloride solution is used to standardize potassium tetraoxamaganate VII solution instead of ammonium iron II sulphate

**calculus help**

integrate:dx/(3x^3-5)^3 help plz show step

**calculus plz help me**

Sir it won,t solve it for me i tried it....i don,t even no how to use it...plz help me

**calculus plz help me**

integrate:dx/((x-1)sqrt(x^2-2) plz show solution i plead

**Economics!**

Suppose a chemical company is in a perfectly competitive industry and has a short run total cost curve of TC = q3 + 5q2 + 10q + 10 and a short run marginal cost of SMC = q2 + 10q + 10. At the price of 49, how many will be produced?

**Economics**

Use the demand curve to derive MR. NOTE: MR is always two times steeper than the demand curve if the equation is linear. Hence, MR=$500-20Q. Use MC=MR 100=500-20Q 20Q=400 Q=20 P=500-10(20)=400. Profit per day= There's no AC so I can't locate it. In terms of tax. If it ...

**economics managerial**

Profit maximizing can be achieved using this formula MC=MR. Differentiate TR to get MR= 5000-10Q Differentiate TC to get MC=6Q 5000-10Q=6Q >> Q=312.50 Use the Q to get TR and TC. To find total profit= TR-TC.

**math**

calculate the volume of the solid when the composite of a cube of edge is 28cm and the square -based pyramid of it height is 16cm

**math**

p=5x3^n can you answer this

**math**

but i don't know how

**math**

make a table and graph each quadratic function. use integers from -3 to 3 inputs 1. y=-x^2 2. y=2x^2 3. y=-8x^2 4. x^2 + 2

**Probability**

The letters in the word MATHEMATICS are arranged randomly. What is the probability that the first letter is E? Preview What is the probability that the first letter is M?

**Probability**

26*25*10*9*8*7*6*5*4= 393120000

**Probability**

A computer password is required to be 9 characters long. How many passwords are possible if the password requires 2 letter(s) followed by 7 digits (numbers 0-9), where no repetition of any letter or digit is allowed?

**english,maths,chem,phy,bio,agric,civic,etc**

What are the equations of motion.

**life orientation**

indetify three courses are interested after grade 12

**physics **

mgh =1/2mv"2 v"2= 2gh v"2=2x10,x12 v=15.5

**Math**

How do i solve for b. 5=2pi/b

**Math**

A sin B (x +- C) d How do i find each letter?

**Math**

How do i find out the sin and cos equation of a sinusoidal graph?

**Math**

How do i find "d" and "c" values in y=cos(x+(pi/2)) Base equation is y= A cos B (x +- C) +- D

**Math**

Yes unclear

**Math**

How do i find the asymptotes of: y=(1/x-4)+3

**chemistry**

Mass=moles/atomic mass of fe2o3

**Math**

How do i find asymptotes without graphing?

**Physics**

How much heat is absorved when a temparature of a piece of iron of mass 0.1kg and specific heat capacity 2*10 rest to power of 2 J/kg/k is rise from 25degree celcius to 75degree celcius

**physics**

A stone of mass 0.7kg is projected vertically upward with a speed of 5m/s.calculate the maximum height reached. [Take g=10m/s^2 and neglect air resistance]. "

**Science**

these are correct

**COMPUTERS**

CALCULATE THE AREA OF CIRCLE OF RADIUS 2CM USING FORTRAN PROGRAMMING LANGUAGE

**Science**

A compound on analysis as 87:8% c,12:2%h determine its empirical formular&molecular formular given mass=56gmol

**Chemistry**

A compound on analysis as 87:8% c,12:2%h determine its empirical formular&molecular formular given mass=56gmol

**calculus**

Find the minimum distance between the curves y=e^x and y=lnx. Hint: Use the fact that e^x and lnx are inverse relationships. I have no idea where to start. Thanks!

**math**

The perimeter of a rectangular concrete patio is 38 meters. The area is 90 square meters. What are the dimensions of the patio?

**math**

the horizontal,vertical and diagonal columns and rows of a magic square all add to the same sum.use the digits 1-16 one time each to make a magic square

**physics**

a car which weight is 1000N is travelling at 90kmn/hr and come to rest in a distance of 50m after applying the brakes. assume uniform acceleration, calculate how large its stopping force was exerted by the friction between the wheel and the road.

**Math**

a 6.5 ounce can of tuna for $1.39 or a 3 ounce can of tuna for $0.65. the 6.5 ounce can of tuna costs ________ the 3 ounce can of tuna costs __________ the ______ ounce can of tuna is the better buy

**Science**

10 b

**logics in programming**

for A=1 to 30

**Physics**

7.6 x 10^3

**Elective maths**

A particle P of mass 7kg is suspended by two inextensible strings AP,BP of lengths 40cm and 75cm respectively. The ends, AP of the strings are attached to two point at the same level, whose distance apart is 85cm. Find angle APB and the magnitude of the tensions in the strings...

**physics sl**

A dead dog of mass 2.2 kg and an initial speed of 5.5 m.s-1 slides along a rough horizontal surface and stops after travelling 4.2 m. calculate the frictional force between the dog and the surface (Think of the work the friction has to do to stop the dog – the Ek of the ...

**math**

What are the steps to show the quotient in simplest form? 0.000027/0.000009

**math**

A certain computer can perform 10^5 calculations per second. how many calculations can it perform in 10 seconds

**MATH PROBABILITY**

Suppose a flashlight manufacturer determined that 2 out of every 50 flashlights are defective. What is the probability that an inspector finds that the first defective flashlight is the 5th one tested? The 12th one tested?

**Chemistry**

I cant for the life of me figure out how to complete this question as our teacher hasn't properly gone over this section.

**Chemistry**

If an aquarium tank holds 100 litres of water, calculate how much heat energy would be required to heat the tank from 18.2 Degrees(C) to 32 Degrees(C)

**Chemistry**

The solubility of potassium nitrate at 20¡ãC is 340g/litre. How many grams of KNO3 can dissolve in 185ml of water?

**mathematics**

A man takes a 500km trip in his car, He rotates his tyres (four on the car and one spare) so that in the end of the trip each tyre has been used for the same number of kilometres. How many kilometres did each tyre cover?

**Maths**

141,386

**English**

In Fahrenheit 451, what pages are these words found on? I really need help just with this. It would be nice to help me out. Here are the words. Part 1: Abruptly, intact Part 2: certitude, darkling, dispersing, linguists, moor, televisors Part 3: scuttling

**Science**

4g of an organic compound gave 2.34g of carbon 0.16g of hydrogen 0.46g of nitrogen 1.04g of oxygen.what is the empirical formula

**PHYSICS**

gn elastic cord can be stretched to its elastic limit by a load of 2N. if a 35cm length of the cord is extended 0.6cm by a force of 0.5N, what will be the length of the cord whem the stretching force is 2.5N

**Life oriantetion**

For 5 interview questions

**physics**

force=m*a 4000-300=3m/s2*m m=1233.33kg

**math**

During the summer holidays,your brother earns extra money mowing lawns.He mows 6 lawns an hour and has 21 lawns to mow.How long will it take him?

**math**

A diver on a platform 40 feet in height jumps upward with an initial velocity of 5ft/s. His height in h feet after t seconds is given by the function h=-16t^2+5t+50. a. What is his maximum height? I got 50.39 b. How long will it take him to reach the surface of the water? h=-...

**Math**

I have the same problem as Marita. Can someone tell us what equation to use. Horizon has a cell phone plan for $28.00 per month plus $.30 per minute with unlimited anytime network minutes and a free flip phone for new customers. How do I put this in an equation. Sprint has a ...

**physics**

isolate for f 1/di = 1/f - 1/do show all the steps pls

**physics**

isolate for t s = ut + 1/2at^2 please show all ur steps

**physicss**

state the precision of the measured quantities 1. 0.07 m 2. 908 s 3. 7.60 L 4. 0.005 0 mm answers: 1. 0.01 m 2. 1 s 3. 0.01 L 4. 0.0001 mm i do not understand this , please explain it to me

**physics**

noo the answer is 1g and 0.01cm

**physics**

state the precision of the measured quantities 1. 353g 2. 6.00cm please explain

**algebra 1**

a heavy freight train made a trip of 360 miles, running part of the distance at 54 miles an hour and the rest at 48 miles an hour. if the entire trip took 7 hours, find the distance traveled at each rate

**World History**

I believe its B

**physics**

a force of 1600N is used to push a crate of brick at a rate of 40m/s squard. If the crate weights 150kg, how much do the bricks weight?

**math**

i got it its 11

**math**

WHAT????????????????

**math**

Camp Oaks gets 32 boxes of orange juice and 56 boxes o apple juice.Each shelf in the cupboard can hold 8 boxes of juice. What is the least number o shelves needed for all the juice boxes?

**math**

c is my best answer.

**math**

C??????????????????????????????????

**math**

FORGET ABOUT A, NOW I THINK IT IS B

**math**

There are 6 muffins in a package.How many packages will be needed to feed 48 people if each person has 2 muffins? A.4 B.8 C.16 D.24

**math**

If the wheel of a bicycle has a diameter of 60cm, calculate how far a cyclist will have travelled after the wheel has rotated 100 times.

**Algebra**

A. "Solve for w: (6w+1)/5≠2. Describe the solution in set notation." First I must find what number to substitute for "w" that WILL equal 2, correct? Then, determine the numbers that won't (I assume there will be far more of these)? What would be ...

**Economics**

Can someone help me with #1 - a,b,c it is on economics20145.weebly

**English**

''Nor was' is not necessary.