Thursday

May 5, 2016
Total # Posts: 1,875

**Math-Problem of the Week**

There are 32 teams in the NFL. 16 of them are in the AFL. The other 16 are in the NFC. At the beginning of the season Julia tried to predict the teams that would be in each Conference championship by randomly drawing 4 teams (2 AFC teaams and 2 NFC teams) from 2 hats. What is ...
*September 18, 2011*

**algebra**

Determine which one of the following values of x is not a soluton of the inequality 0<x+5/6<2.
*September 18, 2011*

**algebra**

Solve the inequlity x^2>16 and give the answer in interval notation.
*September 18, 2011*

**Math**

1. turn them into improper fraction 9 2/3= 29/3 3 5/6= 23/6 2. convert each to the same denominator= 58/6-23/6 you should be able to figure it out from there then simplify if possible
*September 15, 2011*

**math**

3.5x10 to the 3rd 9.82x10 to the 6th
*September 15, 2011*

**math**

1st tell us what you think it is
*September 15, 2011*

**4th grade math help!**

yes i would agree that is would be less than since he rounded down for both
*September 15, 2011*

**6th grade math**

1.50.but can you explain more detailed about the 0.2 thingy.
*September 15, 2011*

**6th grade math**

20 cents. but what if the next number is 1.5.Then how will i solve it.
*September 15, 2011*

**6th grade math**

but why is 2.0 bigger than 0.15?
*September 15, 2011*

**6th grade math**

but why is 2.0 bigger than 0.15?
*September 15, 2011*

**6th grade math**

sally's pencil is 15 hundredths of a meter long(0.15).Edward's pencil is 2 tenths a meter long(0.2).whose pencil is longer?
*September 15, 2011*

**statistics**

Lubbock, Texas ran a survey and determined that 27% of all households subscribed to the daily paper, 32% watched the evening news, and 9% did both. If a household is chosen at random, what is the probability that the evening paper was received or the news was watched?
*September 15, 2011*

**statistics**

An office has 8 secretaries and 5 computer operators. If one employee is picked at random, find the probability that it will be a secretary.
*September 15, 2011*

**statistics**

If a card is drawn at random from a deck of 52, what is the probability that it is an ace or a heart?
*September 15, 2011*

**statistics**

37% of all doctors are family practitioners. If four doctors are picked at random, what is the probability that all four are family practitioners? a.1.48 b.0.0187 c. 0.0168 d. .1369
*September 15, 2011*

**maths**

I apologize but the onnly way I can currently think of involves algebra if you would like to know it let me know. :)
*September 10, 2011*

**comm 100**

I would agree with 2 the definition of ambigious seems to agree with choice 2, as well. Hope that helps!
*September 9, 2011*

**Math**

12/4= 3/1 4/12=1/3
*September 9, 2011*

**communications100 **

I would say 1 or 3
*September 9, 2011*

**algebra**

Multiply across to get 16/3 a negative multiplied by a positive=a negative =-16/3 or 5 1/3
*September 9, 2011*

**8th grade math**

Like Ms. Sue showed, you need to combine like terms. 3n-5n=-2n -7+1=-6 You cannot combine -2n and -6 so the answer would be -2n-6. -2n-6
*September 9, 2011*

**6th grade math**

A resturant manager wants to order new glasses. The ratio of the number of water glasses to the number of juice glasses in the resturant is 15 to 2. How many juice glasses did the resturant manager order if she ordered 180 water glasses?
*September 8, 2011*

**Biology Help!!**

Estimates of the quantity of water required in the production of a pound, or Kg, of beef range from _______________ to __________________. What do you think is the most reasonable estimate of the quantity of water needed to yield a Kg. of edible beef - and why?
*September 7, 2011*

**Biology Help!!**

Estimates of the quantity of water required in the production of a pound, or Kg, of beef range from _______________ to __________________. What do you think is the most reasonable estimate of the quantity of water needed to yield a Kg. of edible beef - and why?
*September 7, 2011*

**3rd grade math**

You could add the 2 numbers she broke it down into to get the answer. 30+7=37 37
*September 6, 2011*

**math (please help)**

f(x)=-(x-1/2)^2(x+1) How to find the y-intercept of the function?
*September 5, 2011*

**spail sheet**

what is the fist anwer.
*August 30, 2011*

**6th grade math**

let x=number of kids 1/2 times x times 7 plus x times 3=1625
*August 24, 2011*

**algebra**

16540=2500 using an algebrac equation problem what is x
*August 12, 2011*

**Precalculus**

A discus is thrown from a height of 3 feet with an initial velocity of 55 ft/s at an angle of 44° with the horizontal. How long will it take for the discus to reach the ground? I started off with 55cos(44)=40 then I made an equation 40t-16(t)=2.5 seconds? I feel like I did...
*August 9, 2011*

**Precalculus**

Thanks reiny! But one question how do you know when to use the triangle method and when to use parallelogram?
*August 9, 2011*

**math**

Thanks for answering! and yes i think there is an error in the question
*August 8, 2011*

**math**

Find cos x if sin x cot x = 4. I got 4 but isnt it impossible for cos to equal 4? Isnt it only supposed to range from -1 to 1? the answer choices are 1)4 2)2 3)1 4)sqrt 2
*August 8, 2011*

**math**

So i need to figure out what the angle and speed was of a foot ball that traveled 59 yards how can i figure that out? what formula can i use?
*August 8, 2011*

**physics**

which of the following is there no net work? A car accelerates down a hill. A car travels at constant speed on a flat road. A car decelerates on a flat road. A car decelerates as it travels up a hill. I say its the first one
*August 6, 2011*

**Math-please help!!**

Normally, the first 3 key points of a sine curve are (0,0), (90,1), and (180,0). If the function is changed to y=-2sin(3x-120)+5, the key points given above change to... Please explain this to me so that I can do it myself.
*August 4, 2011*

**biology**

from the phenotype of the kernals on each P generation cob what would the predicted genotype of any F1 plant be?
*August 3, 2011*

**biology**

Based on what you know about phenotypes and figure 2 for the p generation what is the corn plant genotype on each cob containing the P corn kernals
*August 3, 2011*

**maths**

simplify 12-1/9 /4/3+(1/2)^2
*August 3, 2011*

**Math**

How long will it take for a 1 g sample of Polonium 210 to lose all but 1/28 of its radioactivity if the half-life is 140 d?
*August 1, 2011*

**Math**

How long will it take for a 1 g sample of Polonium 210 to lose all but 1/28 of its radioactivity if the half-life is 140 d?
*August 1, 2011*

**Math**

In a recent dig, a human skeleton was unearthed. It was later found that the amount of 14C in it had decayed to (1/rt8) of its original amount. If 14C has a half life of 5760 years,how old was the skeleton?
*August 1, 2011*

**Math**

In 1976 a research hospital bought half a gram of radium for cancer research. Assuming the hospital is still exists, how much of this radium will the hospital have in the year 6836 if the half-life of radium is 1620 years?
*August 1, 2011*

**Math**

In 1976 a research hospital bought half a gram of radium for cancer research. Assuming the hospital is still exists, how much of this radium will the hospital have in the year 6836 if the half-life of radium is 1620 years?
*July 31, 2011*

**Math**

y=-x^2+1.5x+2 Find the maximum value.
*July 31, 2011*

**Math**

What are some examples of exponential function (Using the formula: Al = A0(1/2)^t/h ), trig functions that are used to find amplitude, period, max, min etc., and combinations of transformation at home or in life in general?
*July 30, 2011*

**Math**

Use the information provided to write the vertex form equation of each parabola. a)y + 60x + 294 = -3x^2 b)−(y+1) = (x−4)^2
*July 27, 2011*

**Math**

A piece of cardboard has a length of 60cm and a width of 40cm. In order to make the cardboard into an open box, a box with no lid), a piece of length x must be cut out of each corner. Write an equation to represent each dimension of the box.
*July 26, 2011*

**Math**

Simplify: (3x+5)^3-3x(x^2-1)
*July 26, 2011*

**Math**

If f(x)=5x+2 and g(x)=x^2+3, then what is f(g(x))?
*July 25, 2011*

**Math**

Which of the following is a solution to the trigonometric equation 2cos2 x - 5cos x + 2 = 0? A) 240 degrees B) 135 degrees C) 270 degrees D) 90 degrees
*July 23, 2011*

**Math**

Identify the period in degrees and radians: y = sin2x: y = cos(3/2)x: y = 2sin(1/2)x: y = 1.5cos0.25x:
*July 23, 2011*

**Math**

Given that the formula is y=-9cos12x+9 What is k in radian?
*July 22, 2011*

**Math**

Time Height above ground 0 45 3 65 6 80 9 85 12 80 15 65 18 45 21 25 24 10 27 5 30 10 33 25 36 45 I know the following things: The minimum is 5 while the maximum is 85. amplitude: 85-5/2 = 40 period =360/45 = 8 vertical translation = 5 + 40 = 45 But I can't seem to get the...
*July 22, 2011*

**Math-please help!!**

Make a word document with the key points (in tables/charts) for the following functions, given in the form y=asink(x+d)+c Start with multiplication/division (multiply ‘y’ by a, divide ‘x’ by k) Then add c to the y values, subtract d from the x values 1.y=...
*July 19, 2011*

**Math**

1) Find three functions with unlimited domains and ranges. 2) Find two functions with restricted domains. 3) Find two functions with restricted ranges. Im confused as to how I can find the answer for these question, can you please explain along the steps.
*July 19, 2011*

**Math**

A ski resort is installing tows on its new ski runs. The baby hill has a vertical height of 500.0 m and is inclined at 42o. Determine the appropriate length of the T-bar cable if it goes to the top of the hill and returns.
*July 19, 2011*

**Math**

A football player is attempting a field goal. The angle formed by the player's position on the field and the line of sight to each upright is 33o. If the distances to the uprights are 7.5 m and 10.0 m, calculate the width of the uprights.
*July 19, 2011*

**Math**

Prove each identity: a) 1-cos^2x=tan^2xcos^2x b) cos^2x + 2sin^2x-1 = sin^2x I also tried a question on my own: tan^2x = (1 – cos^2x)/cos^2x R.S.= sin^2x/cos^2x I know that the Pythagorean for that is sin^2x + cos^2x That's all I could do.
*July 18, 2011*

**Math**

Prove each of the following identities. a)tan^2x = 1 – cos^2x/cos^2x b)sinx/1 – sin^2x = tanx/cosx
*July 17, 2011*

**Math**

Solve for all possible values of x where O°≤x360°. sin x=2/3.
*July 17, 2011*

**Math**

Solve for all possible values of x where O°≤x360°. sin x=2/3. I do not understand these types of questions please answer in as much detail as you can so I can do them myself.
*July 17, 2011*

**Math**

Solve for all possible values of x where O°≤x≤360°. tan x = -1/√3 cos x = 1/2
*July 17, 2011*

**Math**

Determine the EXACT values of each of the following: a) sin 240° b) cos 135°
*July 17, 2011*

**Math**

Find the angle (Θ) for a terminal arm with the following coordinates(round to one decimal place): (5,8)
*July 16, 2011*

**Math**

What are some examples of acute and obtuse triangles in a home?
*July 16, 2011*

**Math**

Determine the exact value of: sin30° + cos225° + sin150° + cos330°
*July 15, 2011*

**Math**

The winner of a popular lottery is offered one of two options: i) a lump sum of $102 500 ii) $1000 every month for 10 years If the money can be invested at 3.0% p/a, compounded monthly, which option should the winner choose? Justify your reasoning. Every three months, Carlos ...
*July 14, 2011*

**Math**

How much would you have to invest at 6.3% interest for it to have grown to $67.06 in five years
*July 14, 2011*

**Math**

That can't be right...the correct answer shows it should be 12 years.
*July 13, 2011*

**Math**

You invest $25 in an account earning 7.5% interest per year. After how many years is it worth $42.50?
*July 13, 2011*

**Math**

Sam gets deposits a total of $3500 every three months to the bank which earns a 6.5% p/a. After five years how much will he have in his account? Ren wants to buy a new car that costs $26255, so, he would deposit money into his savings account with an interest rate of 3.9% p/a ...
*July 13, 2011*

**Math**

Stacey buys a $1000 RRSP today. After one year she adds $2500. By the end of the second year, the money has grown to $3851 as it has earned interest over time. What rate of interest does the money earn? 1000x^2 + 2500x - 3851 Use the quadratic formula above and your calculator...
*July 12, 2011*

**Math**

Determine the present value of the annuity: $1500 at the end of each 3-month period, for 5 years, at 4.5% p/a, compounded quarterly
*July 12, 2011*

**Math**

Imagine you have invested $500 in an account that pays 5% simple interest per year. Can you find an arithmetic sequence to look for the amount of money in the account after 20 years?
*July 12, 2011*

**Physics**

If you go to google and type "conservation of momentum photogate lab penn state" this is just like the experiment we performed. It should be the top result "Physics 250 Laboratory: Conservation of Momentum. Hope this helps.
*July 11, 2011*

**Physics**

So I had an exam today and one of the questions is bugging me. Our professor is out of town for a few days, so we had a proctor and I still can't figure it out using my notes. It was a question about two carts and deals with momentum. Cart A is at rest between two ...
*July 11, 2011*

**Physics**

So I had an exam today and one of the questions is bugging me. Our professor is out of town for a few days, so we had a proctor and I still can't figure it out using my notes. It was a question about two carts and deals with momentum. Cart A is at rest between two ...
*July 11, 2011*

**Math**

tn - tn-1 = 2n + 3; t1 = 10 Find the first five terms in the sequence using this recursive formuls
*July 11, 2011*

**Math**

tn - tn-1 = 2n + 3 Find the first five terms in the sequence using this recursive formuls
*July 11, 2011*

**chemistry**

How many grams of acetic acid (MW = 60 g/mol, pKa=4.75) are needed to change 1000 L of water with a pH of 11 to a pH of 5.5?
*July 8, 2011*

**MATH**

Halley's comet appears in the sky approximately once every 77 years. If the comet was seen in by Astronomer Edmund Halley in 1531. How many times has the comet been spotted since?
*July 8, 2011*

**chemistry**

How many grams of HCl are needed to change 1000 L of water with a pH of 11 to a pH of 5.5?
*July 8, 2011*

**PHYSICS **

A 240 g block on a 41 cm-long string swings in a circle on a horizontal, frictionless table at 73 rpm. (a) What is the speed of the block? (b) What is the tension in the string?
*July 7, 2011*

**physics**

A 5.0 m diameter merry-go-round is initially turning with a 4.6 s period. What is the speed of a child on the rim?
*July 7, 2011*

**Math(Pre=Calc)**

The first term in a sequence of number is t1 = 4. The terms that follow are defined by the formula: tn - tn-1 = 3n -2. Determine the value of t50.
*July 6, 2011*

**physics**

A penguin sliding on ice has an initial velocity of 5 m/s due north. Due to a strong wind, the penguin has an acceleration of 2 m/s2 SE. What is the penguin’s displacement (magnitude and direction) after 4 seconds
*July 5, 2011*

**physics**

Three forces act on a 3 kg box: 10 N South-west, 17 N North-west, 5 N due East. What is the acceleration of the box?
*July 5, 2011*

**physics**

You throw a ball downwards with a speed of 10 m/s. It hits the ground 4 meters below from where you threw it. How long is the ball in the air and what is the ball’s velocity just before it hits?
*July 5, 2011*

**physics**

A .5 m long, 3 cm diameter metal bar has a Young’s Modulus of 7.0x1010 N/m2. If a 50,000 N force is applied to the end of the bar, by how much will it compress?
*July 5, 2011*

**speech **

it has to be one describing word but i need two more and those websites were no help to me
*July 3, 2011*

**Algebra 2**

what number did they give you because you have to plug the answer in for X these are two differnt parts. The question is say use X+5 if x is greater than 0 or the answer is three if x is less than 0
*July 3, 2011*

**physics**

A 3.0 m tall, 42 cm diameter concrete column supports a 230,000 kg load. By how much is the column compressed? Assume Young's modulus for concrete to be 3.0 1010 N/m2. in mm
*July 2, 2011*

**PHYSICS**

a 10cm long spring is attached to the ceiling. when a 2.6kg mass is hung from it, the spring stretched to a length of 15cm. what is the spring constant k how long is the spring when a 4.0 kg mass is suspended from it
*June 30, 2011*

**physics**

a skater holds her arms outstretched as she spins at 140 rpm. What is the speed of her hands if they are 125 cm apart?
*June 28, 2011*

**Physics**

A 36 kg box hangs from a rope. What is the tension in the rope if the following are true? (a) The box moves up a steady 5.0 m/s? (b) The box has vy = 5.0 m/s and is slowing down up at 5.0 m/s2?
*June 22, 2011*

**physics**

thank you!
*June 22, 2011*

**physics**

A 20 kg crate is placed on a horizontal conveyor belt. The materials are such that μs = 0.6 and μk = 0.3. (c) What is the maximum acceleration the belt can have without the crate slipping? (d) If acceleration of the belt exceeds the value determined in part (c), what...
*June 22, 2011*

**physics**

How much force does an 60 kg astronaut exert on his chair while accelerating straight up at 8m/s squared?
*June 21, 2011*