# Posts by bob

Total # Posts: 3,275

**PreCal**

Express the setW={x∣x>2} using interval notation.

**PreCal**

Over a 5 week period, the price of an MP3 player dropped steadily, from $140 to $90. What was the average weekly change in the price of the MP3 player over this period?

**physics question help plz!**

1-What is the shape of the trajectory of a charged particle moving in a uniform electric field if its initial velocity is null? 2-What is the shape of the trajectory of a charged particle moving in a uniform electric field if its initial velocity is perpendicular to the field...

**physics question**

1-What is the shape of the trajectory of a charged particle moving in a uniform electric field if its initial velocity is null? 2-What is the shape of the trajectory of a charged particle moving in a uniform electric field if its initial velocity is perpendicular to the field...

**Math**

I have no idea. Sorry :(

**Math**

One alloy is 2 parts iron to 3 parts silver and another alloy is 7 parts iron to 3 parts silver. How much of each should be combined to produce a 30 pound alloy that is 1 part iron to 1 part silver?Please show me how to do this

**calculus 1**

L=22.360 W=44.722

**accounting**

98000

**science**

what was the answers?

**Math**

What is 18 millionths written in standard form

**math**

x<0 or x>0 what's another way of expressing it in perfect square terms?

**Physics**

A 5.8 kg object is accelerated from rest to a speed of 53.3 m/s in 55 s. What average force was exerted on the ob- ject during this period of acceleration? Answer in units of N.

**Art**

Is it not b?

**Math**

We can't help you if not all information is present. If we see the whole question, we can provide a more accurate response to which will benefit you. Ms. Sue is correct; this post is insufficient.

**physics**

Displacement is a vector quantity that describes the shortest path between two points!

**physics**

You see some management students getting drunk at 1 PM in the quad. (Yes, this is an early wake up call for them.) You decide to tie a 2.00 daN water balloon on the end of a 1.00 m long light rope and start swinging it horizontally. The rope from your hand to the water balloon...

**astronomy**

On Earth, an astronaut weighs about 600 Newtons. The mass of the Earth is about 6 x 1024 kg, and the radius of the Earth is about 6.4 x 106 m. Suppose the astronaut climbs a ladder to a height of one Earth radius above the Earth. What is the new weight of the astronaut? please...

**Physics**

Above Answer is wrong

**Math**

10/16 * 1/15 = 1/24

**physics**

what is the heat capacity of a gold ring that has a mass of 7.00g

**Physics**

Suppose the 480 lbs pile driver that drops 20 ft drives the pile 2.0 in. every time it strikes the pile. What is the average resisting force of the ground where the pile is driven? Answer: 57,600 lbs Show Work

**Physics**

A 25 g bullet with a muzzle velocity of 300 m/s is fired into a board 4.0 cm thick. For a soft board, the bullet goes through the board and emerges with a speed of 50 m/s. What was the average force exerted on the bullet by the board? Answer= 27344 N Show Work

**Maths**

9.6

**Maths**

9.9 rounding to the nearest meter

**Math**

160

**English-poem help**

Is the poem I wrote a sonnet? My aunt has cancer, i don't know how, i sit and wonder why. I get mad at God and often say i hate him. I know its not his fault, but who am i supposed to blame, its all just bad shame. I walk to see her on her bed, in pain, holding on to her ...

**Physics**

A falling rock has a speed of 1.5 m/s. What is the velocity of the rock when it hits the ground 5 seconds later? Give the magnitude and direction

**math**

Hillary has to drive 225 miles in four and a half hours. What should her average speed be in order to arrive on time?

**History**

YOUR A TEACHER AND YOUR TELLING A STUDENT NO YOUR ON YOUR OWN. EHHH

**Algebra**

10 days, because the x of the vertex is the maximum profit

**math help pls pls pls**

suck it math

**Art World Culture**

butthole

**math**

What is 6x to the third power+3x to the second power -9x

**science**

l

**Probability! Check please!**

thank you

**math**

A deck of cards are shuffled 20 times. You are dealt 12 cards at random: what is the probability that all 12 cards are black? or what is the probability that all 12 cards are kings, queens or jacks

**physics**

butthole

**socialstudies**

Yes100

**Physics**

idk bro

**algebra**

34 - x - (x-1) 34 - x + x + 1 34 - 2x + 1 35 - 2x correct?

**algebra**

^ where do you get the 35 and 2x?

**Algebra 1 (variable expressions)**

6*(x-9)-5 When x=5

**statistics**

Scores: 5,2,4,2 ΣX-2 Σ(X-2) Σ(X-2)^2 can you show me a better idea how to solve this thanks

**math**

solve the following system of equations enter the x coordinate of the solution. Round your answer to the nearest tenth. 5x+2y=22 -2x+6y=3

**Social Studies**

it is United States 100%

**Language Arts**

b c a d c

**Math**

Find the largest $n$ so that $f(2) \cdot f(3) \cdot f(4) \cdots f(n-1) \cdot f(n) < 1.98.$

**business**

Please provide a short summary of your approach to business development and the methods that you use. this is not for school im just confused with the question

**English**

What is Anne Franks relationship with her parents compared to Peter VanDaan.

**math**

A CACTUS CASTS A SHADOW THAT IS 14ft 7in long. A gate nearby casts a shadow that is 5 ft long. Estimate the height of the cactus.

**Math**

Need help solving for x with work shown 2log6(4x)=0 Log2(x)+log2(x-3)=2

**Chemistry**

On the semi - reactions below is correct to say: Li + + 1℮- => Li. Eº = -3,04V. Au 3+ + 3℮- => Au. Eº = + 1,50V. Pb 2+ + 2℮- => Pb . Eº = - 0,13V. Ag + + 1℮- => Ag. Eº = + 0,80V. a) In the semi reaction Ag, the potential ...

**Finance 101**

Given the recent drop in mortgage interest rates, you have decided to refinance your home. Exactly five years ago, you obtained a $150,000 30-year mortgage with a fixed rate of 10%. Today, you can get a 30-year loan for the currently outstanding loan balance at 7.5% interest. ...

**Math**

x^(1/3)(x+3)^(2/3). Doing curve sketching and cannot seem to figure out what the values are to fill out the chart(intervals-f''-behaviour). I can't seem to find the conacvity values, i don't think they exist. How should I prove that they don't exist? Or do ...

**Math**

so mainly i relly don't know so good luck

**Math**

Use prime number division to determine the Least Common Denominator: 30 = 2 x 3 x 5 60 = 2 x 2 x 3 x 5 90 = 2 x 3 x 3 x 5 Now write each term the maximum number of times it appears in each equation: 2 appears twice in the 60 minute equation, 3 appears twice in the 90 minute ...

**Math**

mainly i really don't know so goog d luck

**Math**

Esther drove to work at 45 miles per hour. Returned home at 30 miles per hour. If Esther spent a total of one hour commuting to and from work, how many miles did Ester drive to work in the morning?

**Math**

find the extrema of f(x)=x^(2/5), -3<=x<1. I find zero critical points, but the answer says there is a maxima and minima at 0 and -3.

**ART 4 QUESTIONS PLZ HELP ASAP**

Yay Sid is right I got 4/4

**maths**

a cube of material of side 3cm ( nearest mm) and mass 27 grams (nearest 10th of a gram) is placed into a bowl of deep water. Will the material sink or float? explain answer with suitable calcuations

**Math**

which points of f(x)=arcsin(sinx) are not differentiable? And what is the range of this function? How could I do this without graphing? I am just afraid that my test, which does not allow calculators, will have some question asking me to find this information. Also, when are ...

**English**

thank you

**English**

how can i improve thesis statment?

**Math**

y=[(3-4x)^(2/3)]/[(x^2+8)^(1/3)*(7+4x^3)^2]

**Math- steve? reiny?**

1. Let f(x)=x^5 + 2x^3 + x - 1 Find f^-1(3) and (f^-1)'(3)? I have zero idea how to find the inverse of this function at a point 3, and how to take derivative of an inverse. 2.Let f(x)=cosx + 3x Show that f(x) is a differentiable inverse and find f^-1(1) and (f^-1)'(1...

**Chemistry**

In the lab, 5.8 L of methane gas is burned with excess oxygen gas at SATP. How much carbon dioxide gas is produced? **Based on the balanced chemical equation the ratio of methane gas to carbon dioxide is 1:1, this being said, does it make sense that as 5.8 L of methane gas is ...

**Math**

derivative of y=3(2x^(-1/2)+1)^(-1/3). I got -(2x^(-1/2)+1)*(-x^(-3/2))=y' but I don't know how to simplify it into 1/something. When I tried I only got [2x^(3/2)+x^2]/(x^(7/2)). Help with simplifying?

**geometry**

thanks

**geometry**

how can you find the geometric mean?

**Math**

I don't get what you did after log(Y)=Lim x->∞ (1/x)(xlog(5)+log(1+(2/5)^x) . Why is (2/5)^x -> 0, and hence log(1)=0??

**Math**

derivative of lim x->infinite (2^x+5^x)^(1/x)? I do it till [2^xln(2)+5^xln(5)]/(2^x+5^x) and then I can't simplify anymore. Help me out?

**Math**

Find limit as x approaches 0 of (1+sin4*x)^cotx I know how to do this question because there was a "hint“ in the question that said to use natural log. I was just wondering if someone could explain to me why using log works in this case along with l'hopital's...

**Science**

does any one know

**Math**

Could I please get some help for these 3 questions, apologies for asking so many, but they were the ones I was really unsure of: 1. Find an equation for the line tangent to y=ln(x) and that goes through the origin. I have no idea, the ln(x) stuff is confusing me. 2. derivative...

**Math**

The median of 8 numbers is less than zero. At most how many of the numbers are positive?

**Math**

Thank you very much! I get it now. For another question: y'=lim h->0 ((e^x+h)-e^x)/h. So I simplified this and got (e^x)* lim h->0 ((e^h)-1)/h. But I don't understand why and how ((e^h)-1)/h equals 1. Explain?

**Math**

find an equation for the line tangent to the graph of y=arccot(x) at x=1. I found that slope is -1/(1+x^2). I don't know how to evaluate arccot(1) to find y value.

**Science**

How much energy is needed to raise the temperature of 1500g of ice from -21.0 degrees Celsius to 113 degrees Celsius

**Math**

How do I use y=ne^kt formula?

**Math**

I know it's y=ne^kt. How do I use it? Quick answer.

**Math**

What is bacterial growth formula?

**math**

dwight made 13 shots at the basketball game on friday night and made a total of 30 points. she scored 5 more two pointers than three pointers. how many of each type of baskets did she make? Also make equations to help figure it out.

**science**

in addition to body structure and development, which of the following is used to classify animals? Speed, color, DNA or location

**Math**

I'm in sixth grade and I need help on 3(12w+8)+17+9w

**Algebra**

You travel with a boat 90 km downstream with the current in 6 hours and back upstream in 10 hours. Find the speed of the stream and the speed of the boat in still water, assuming that the motion is uniform.

**chemistry**

How to solve this problem in counting atoms 2 pb(CN)2

**mathmatics**

As I read this ((.8R)-5000).75=7500 solve for R, the initial amount. The amount spend is .2 of that R.

**calculus**

I just saw Prof Damon's response. I had the same thought, it was CalTech, Georgia Tech, or MIT. Review his outline first.

**calculus**

The satellite can see to the horizon. So along the surface, let the horizon be a distance r from the upcoming inmpact point. Then in basic geometry, one can reduce this to (d+y)^2=y^2+r^2 (with sherical trig, it is more complicated, but it at small d reduces to the simple ...

**Mathematics**

yes, of course. What you are ignoring is what units is the gradient. For instance 12375 nanometers/mile is a pretty level road. However, 12375meters/mile is a rather steep road.

**Physics**

The pressure goes from 290 to 102 kPa. V=800cm^3*290/102

**Physics**

see other post.

**chemistry**

what reaction?

**chem.**

how many g of Fe2O3 are produced if 3.00 g of Fe reacts?

**Algebra**

Mr. Pilgram needs fencing for his turkey coop. The perimeter is 240 yards. The length is 16 yards longer than the width. What are the dimensions? What is the area?

**Chemistry**

A substance undergoes a first-order decomposition. After 40.0 min at 500 degrees C, only 12.5% of the original sample remains. What is the half-life of the decomposition? If the original sample weighted 243 g, how much would remain after 2 hours?

**math**

a radiator holds 5 gallons. how much of the 30% antifreeze solution should be drained and replaced with pure water to reduce the solution to 9% antifreeze?

**math**

9 by 6

**Math**

24