Sunday

February 14, 2016
Total # Posts: 627

**physics**

What potential difference is required to reduce the initial speed of the proton by a factor of 2? A proton has an initial speed of 3.1×105 m/s .
*February 3, 2016*

**Math**

Sarah made a square tablecloth and wants to put lace around the edges. The length of one side of the tablecloth is 56 inches. How much lace will Sarah need?
*February 2, 2016*

**ONE math question! Check please, thank you!**

Correct!!
*February 1, 2016*

**algebra 1 **

a bout travels 280 miles downstream and back. The trip downstream took seven hours. The trip back took 14 hours. The speed of the boat in still water and the speed of the current
*January 13, 2016*

**Physics **

google search the first part of the equations i have it up with the picture
*December 11, 2015*

**Physics **

A woman holds a 1.90-m-long uniform 5.0-kg pole as shown in (Figure 1) ( its horizontal). A. Determine the force she must exert on the pole at A. Express your answer to two significant figures and include the appropriate units. Enter positive value if the force is upward and ...
*December 11, 2015*

**English**

Its not d
*December 2, 2015*

**English**

Thank you
*December 2, 2015*

**English**

In the sentence "There comes a time when the cup of endurance runs over, and men are no longer willing to be plunged into an abyss of injustice," the bolded phrase creates a mood of __________ among the audience A.Panic B.Despair C.Anger D.Anticipation
*December 2, 2015*

**Math**

A.625-465=$160 he has to pay for 2 days=160 $ rent paid for 1 day=260/2=$80 amount paid for 5days=8*5=$400 But he paid $465 Difference 465-400=$65 so every one has to pay $65+rent for the no. of days total rent for x days y=65+80 x (dollars) B. f(x)=65+80 x
*November 25, 2015*

**Math**

Is |5|and |-5|equal? Its really hard to figure out.
*November 3, 2015*

**chemistry**

If 6.30 moles of C5H12 reacts with excess O2, how many moles of CO2 will be produced in the following combustion reaction?
*October 15, 2015*

**Applying Rational Number Operations**

Do u think that is going to help Ruby no offense I just really need help
*October 7, 2015*

**Applying Rational Number Operations**

HELP PLEASE
*October 7, 2015*

**Applying Rational Number Operations **

(7th grade regular math) One half liter of lemonade concentrate is added to 3 liters of water. How many 1/3-liters serving are made? How would you do the math for this question? Please help I really need this question answered
*October 7, 2015*

**chemistry**

Thanks
*September 29, 2015*

**chemistry**

Write potassium sulphate +barium nitrate ¨ potassium nitrate + barium sulphate as a balanced symbol equation
*September 29, 2015*

**math help needed!**

Estimate the instantaneous rate of change of the function f(x) = x ln x at x = 1 and at x = 3. (Use h = 0.1, 0.01, 0.001, 0.0001, and so on. Round your answers to four decimal places.)
*September 17, 2015*

**math**

Find the derivative algebraically. g(t) = t^2 + t at t = −1 I can't seem to start this problem correctly. What is the process required for this question?
*September 16, 2015*

**math please help me!**

This is what I have done so far for part a: I plugged in h = 0.01 got f'(1) = 1.004983416 h= 0.001, which equals 1.0049 h = 0.0001, and got 1.000049998 h = 0.00001 and got 1.000005 h 0.000001 and got 0. I tried putting in 1.0049, 1.0050, and 0.0000 in but none of those ...
*September 16, 2015*

**math please help me!**

Estimate the instantaneous rate of change of the function f(x) = x ln x at x = 1 and at x = 3. (Use h = 0.1, 0.01, 0.001, 0.0001, and so on. Round your answers to four decimal places.) f '(1) = f '(3) = What do these values suggest about the concavity of ...
*September 16, 2015*

**math help please!**

Nevermind, I got it! I just needed to zoom out more on my graph.
*September 8, 2015*

**math help please!**

I got zero for part a by plugging the function into a calculator but I still do not get part b.
*September 8, 2015*

**math help please!**

Assuming that limits as x → ∞ have the properties for limits as x → c, use algebraic manipulations to evaluate lim x → ∞ for the function. a. f(x) = x − 2/2 + 6x^2 b. f(x) = x^2 + 6/x + 7 Please help! I do not know how to start with this ...
*September 8, 2015*

**math/physics**

Wait nevermind! I got it! Thank you so much!
*September 7, 2015*

**math/physics**

How do you find the vertex? Do you just put it into a graphing calculator?
*September 7, 2015*

**math/physics**

A pomegranate is thrown from ground level straight up into the air at time t = 0 with velocity 96 feet per second. Its height at time t seconds is f(t) = −16t2 + 96t. a) Find the time it hits the ground. t=? s b) Find the time it reaches its highest point. t=?s c) What ...
*September 7, 2015*

**math**

Thank you so much! I missed the negative part about the term which definitely impacted the answer.
*September 7, 2015*

**math**

Determine the end behavior of the function as x → +∞ and as x → −∞. f(x) = 1000 − 39x + 51x^2 − 10x^3 As x → +∞, f(x) → ???? . As x → −∞, f(x) → ??? I know that the end behavior of the function...
*September 7, 2015*

**math please help!!**

Thank you so much! That helped a lot!
*September 3, 2015*

**math please help!!**

The depth d of water in a tank oscillates sinusoidally once every 4 hours. If the smallest depth is 7.9 feet and the largest depth is 10.1 feet, find a possible formula for the depth in terms of time t in hours. (Let the water depth be at the average when t = 0.) I got y=1....
*September 3, 2015*

**math**

thank you!!!! I did mess up the period. I didn't think about it that way. Thank you so much!
*September 2, 2015*

**math**

The desert temperature, H, oscillates daily between 36°F at 4 am and 56°F at 4 pm. Write a possible formula for H in terms of t, measured in hours from 4 am. I thought the answer is -10cos(1/6pi times t) +46 but it got marked wrong. I thought that the amplitude is 10 ...
*September 2, 2015*

**math! please help!**

Thank you so much!! That really helped!
*September 2, 2015*

**math! please help!**

For a boat to float in a tidal bay, the water must be at least 2.7 meters deep. The depth of the water around the boat, d(t), in meters, where t is measured in hours since midnight, is d(t) = 5 + 4.6 sin(0.5t). (a) What is the period of the tides in hours? (Round your answer ...
*September 2, 2015*

**Math**

A banquet hall has 22 tables for 4 and 15 tables for 6 ,but 3 chairs are missing from the tables .How many many chairs will there be if 134 are seated
*August 31, 2015*

**math**

If you have to find f(t)g(t) where f(x) = 2/x and g(x) = 4x+2 I got 2/t times 4t+2 and then from that I got 8t+4/t. How do I simplify that further?
*August 31, 2015*

**math**

Just kidding! I got it!
*August 31, 2015*

**math**

Find f(g(x)) where f(x) = 2/x and g(x) = 4x+2 I got till 2/(4x+2) but am not sure where to go from there. Please help!
*August 31, 2015*

**math**

For the data I gave above, we need to find a formula for the exponential function. I got b to be 605. That part is right at least, right? Because of how 605 = b times a^0 which means b equals 605. (0 because the 605 matches up with sea level in the data--I posted it weirdly) ...
*August 30, 2015*

**math**

How did you get the 0.0000917? I plugged log(1.096) divided by 1000 and got 3.98 times 10 to the -5.
*August 30, 2015*

**math**

For example, when I try to solve an equation like 1.096 = a^1000, what should I do? I'm trying to find a formula for this set of data and that's how I got the above equation: d=??? Elevation (ft) Sea level labeled h 1000 2000 3000 4000 Takeoff roll (ft) labeled d 605 ...
*August 30, 2015*

**math**

Thank you! I forgot that you could divide the two!
*August 30, 2015*

**math**

Given an exponential graph that are concave up and the points (1,4) and (-1, 16), give a possible formula of the function. I plugged the variables into the f(x)=b times a^x and got: 4= b times a^1 and 16=b times a^-1 I am not sure where to go from here.
*August 30, 2015*

**math**

Thank you so much for all of your help!
*August 28, 2015*

**math**

A town has a population of 2000 people at time t = 0. In each of the following cases, write a formula for the population, P, of the town as a function of year t. (a) The population increases by 60 people per year. I thought it would be P= 2000 (1.03)^t (b) The population ...
*August 28, 2015*

**Math**

Wow, you're a genius! Thank you so much, that worked! I didn't even think about involving the quadratic equation! Thank you again!
*August 27, 2015*

**Math**

For better clarification, the first part to this problem had (0,2) instead of (0,b) and the answer came out to be (-2,4). I kind of guess and checked for that question.
*August 27, 2015*

**Math**

Consider the functions in the figure below. Find the coordinates of C in terms of b. So there are two functions. There is the y=x^2 u-shape and then a line in the middle of it with points (0,b) and (1,1) in that order from left to right. Farther to the left of point (0,b) is ...
*August 27, 2015*

**math**

Thank you so much! That worked!
*August 27, 2015*

**math**

I posted this question yesterday and I was told I was correct but for some reason the online hw website will not take it.
*August 27, 2015*

**math**

For tax purposes, you may have to report the value of your assets, such as cars or refrigerators. The value you report drops with time. "Straight-line depreciation" assumes that the value is a linear function of time. If a $1020 refrigerator depreciates completely in...
*August 27, 2015*

**math**

Thank you so much! That really helps. I totally forgot that the range would have to be over 9 due to the plus 9 in the equation.
*August 27, 2015*

**math**

Find the domain and range for y=x^2+9. Is the answer all real numbers? How would you enter that in interval notation? From Googling the definition of real numbers, I now understand that the infinity sign would not be included. For a continuous function you use closed brackets...
*August 27, 2015*

**Math (functions)**

Thank you!
*August 26, 2015*

**Math (functions)**

For tax purposes, you may have to report the value of your assets, such as cars or refrigerators. The value you report drops with time. "Straight-line depreciation" assumes that the value is a linear function of time. If a $1020 refrigerator depreciates completely in...
*August 26, 2015*

**chemistry **

Arrange the following aqueous solutions in order of decreasing freezing points (lowest to highest temperature): 0.10 m Na3PO4, 0.35 m NaCl, 0.20 m MgCl, 0.15 m C6H12O6 and 0.15 m CH3COOH.
*July 20, 2015*

**Physics**

M1 = 45.0 kg is a spherical mass at the origin. M2 = 16.6 kg is also a spherical mass, and is located on the x-axis at x = 78.0 m. At what value of x would a third mass M3 = 15.5 kg experience no net gravitational force due to M1 and M2?
*July 11, 2015*

**PHYSICS**

Can you please make a solution for this problem so i could understand it better...
*June 20, 2015*

**PHYSICS**

A and B run around a circular track whose cicumference is 150m. when they run is opposite directions they meet every 5 seconds, but when they run in the same direction from the some point they are together every 25 seconds. what are their rates? ans. 18m/s and 12m/s can you ...
*June 20, 2015*

**science**

how physical/mechanical and chemical weathering different?
*May 18, 2015*

**science**

how are they different?
*May 18, 2015*

**science**

can someone help me?
*May 18, 2015*

**science **

how are physical/mechanical and chemical weathering alike?
*May 18, 2015*

**PLEASE HELP ME!!**

someone please help me figure out this problem, and btw i am not asking for answers as others say... i am asking how to figure it out or for hints. :)
*May 17, 2015*

**PLEASE HELP ME!!**

UGH THIS PROBLEM IS KILLING ME!!!!!!!!!
*May 17, 2015*

** PLEASE HELP ME!!**

Last year, the Widget Corporation had $650,000 in sales. This year, sales are down 4%. How much did the Widget Corporation sell this year?
*May 17, 2015*

**math**

thank you so much!
*May 17, 2015*

**math**

is it 1.0335 and then round up?
*May 17, 2015*

**math**

would you do 7.95*0.13?
*May 17, 2015*

**math**

ok but i dont know how to do this...
*May 17, 2015*

**math**

70
*May 17, 2015*

**math**

would it be 65.95?
*May 17, 2015*

**math**

what do you mean though?
*May 17, 2015*

**math**

so can i round to 95 dollars .30????
*May 17, 2015*

**math**

wait, so would you do 100-30=70 and then round up????
*May 17, 2015*

**math**

do you do 0.30*94.95????
*May 17, 2015*

**math**

. A jacket costs $94.95. It is on sale for 30% off. Estimate the sale price.
*May 17, 2015*

**math**

do 0.06*12.95=0.777
*May 17, 2015*

**math**

. Estimate the sales tax and final cost of a book that costs $12.95 with a sales tax of 6%.
*May 17, 2015*

**math**

this problem is esay and simple, all you do is that you kinda just round up to the nearest decimal, so 0.09*112,000=10,080
*May 17, 2015*

**math**

A real estate agent receives a 9% commission for every house sold. Suppose she sold a house for $112,000. Estimate her commission.
*May 17, 2015*

**Stats**

From previous records a shipping company knows that the cost to deliver a small package within 24 hours is $15.50. The company charges $17.95 for shipping, but guarantees to refund the full charge if the delivery is not made within 24 hours. If the company fails to deliver ...
*May 5, 2015*

**Physics**

a 0.30-m radius automobile tire rotates how many rad after starting from rest and accelerating at a constant 2.0 rad/s^2 over a 3.54-s interval
*April 20, 2015*

**Calculus I **

Hello, The pressure P and volume V of an expanding gas are related by the formula PVb=C, where b and C are constants (this holds in adiabatic expansion, without heat gain or loss). Find dPdt if b=1.6, P=12kPa, V=80cm2, and dVdt=20cm3/min. Thus far, I got d(PV)/dt= p(dv/dt) + V...
*April 10, 2015*

**Physics **

a 12 kg physics book flies through the air with a momentum of 20kg m/s. what is its speed?
*April 6, 2015*

**Physics**

Yes the original mass was 20.0kg my mistake. According to my calculations the answer will be -6m/s.
*April 6, 2015*

**Physics**

A 2.0kg object initially at rest explodes breaking into two pieces of mass 5.0kg and 15.0kg. If the 15.0kg piece moves with a speed 2m/s what is the speed of the 5.0kg piece? A. -6 m/s B. 15 m/s C. -5 m/s D. 20 m/s
*April 6, 2015*

**Math**

2*5
*March 12, 2015*

**BOB**

A sphere of radius 20 cm and mass 1.80 kg starts from rest and rolls without slipping down a 30.0 degree incline...
*March 10, 2015*

**science**

1.40g each of CO, H2O, and H2 are sealed in a 1.41−L vessel and brought to equilibrium at 600 K. CO(g)+H2O(g)⇌CO2(g)+H2(g)KC=23.2 How many grams of CO2 will be present in the equilibrium mixture?
*March 10, 2015*

**Chemistry**

how much heat is absorbed when 63.7 grams of water at 100 degrees Celsius is converted to steam at 100 degrees Celsius? -I need help figuring out how to do this.
*March 4, 2015*

**Physics**

Two blocks are connected by a string on a pulley. One block is on an incline, and the other is hanging. The smooth inclined surface makes an angle of 35 ∘ with the horizontal, and the block on the incline has a mass of 5.7 kg. The mass of the hanging block is m = 4.0kg...
*February 25, 2015*

**PHYSICS**

A hypothetical planet has a mass 1.55 times that of Earth, but the same radius. What is g near its surface?
*February 20, 2015*

**math**

Emma os using connecting cubes to make a rectangular model with a height of one connecting cube. With her cubes she can make the model in exactly 3 different ways. If Emma has more than 12 but fewer than 17 cubes how many cubes does she have
*February 19, 2015*

**math**

Hey someone use 192 beads to make a necklace and bracelet it takes 5 times as many beads to make the necklace that the bracelet how much beads it take to make the necklace
*February 12, 2015*

**physics**

A rifle bullet is fired at an angle of 28.3° below the horizontal with an initial velocity of 177 m/s from the top of a cliff 52.2 m high. How far from the base of the cliff does it strike the level ground below?
*January 6, 2015*

**math**

At a local high school,560 out of 1060 students voted to support a community fund drive. What percent of the students did not support the fund drive? 47% is this the correct answer?
*December 19, 2014*

**physics**

A 590 kg racing car completes one lap in 14.3 seconds around a circular track with a radios of 45.0 meters. The car moves at constant speed. (A) what is the acceleration of the car? (B) what force must the track exert on the tires to produse this acceleration?
*December 11, 2014*