# Posts by Bob

Total # Posts: 3,277

**Algebra 1 (variable expressions)**

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

*February 12, 2016*

**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

*February 11, 2016*

**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

*February 11, 2016*

**Social Studies**

it is United States 100%

*February 5, 2016*

**Language Arts**

b c a d c

*February 4, 2016*

**Math**

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

*February 4, 2016*

**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

*February 4, 2016*

**English**

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

*February 3, 2016*

**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.

*February 2, 2016*

**Math**

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

*January 27, 2016*

**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 ...

*January 22, 2016*

**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. ...

*January 20, 2016*

**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 ...

*January 19, 2016*

**Math**

so mainly i relly don't know so good luck

*January 19, 2016*

**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 ...

*January 18, 2016*

**Math**

mainly i really don't know so goog d luck

*January 17, 2016*

**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?

*January 17, 2016*

**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.

*January 17, 2016*

**ART 4 QUESTIONS PLZ HELP ASAP**

Yay Sid is right I got 4/4

*January 15, 2016*

**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

*January 12, 2016*

**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 ...

*January 11, 2016*

**English**

thank you

*January 11, 2016*

**English**

how can i improve thesis statment?

*January 11, 2016*

**Math**

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

*January 11, 2016*

**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...

*January 11, 2016*

**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 ...

*January 10, 2016*

**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?

*January 10, 2016*

**geometry**

thanks

*January 9, 2016*

**geometry**

how can you find the geometric mean?

*January 9, 2016*

**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??

*January 9, 2016*

**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?

*January 9, 2016*

**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...

*January 7, 2016*

**Science**

does any one know

*January 7, 2016*

**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...

*January 6, 2016*

**Math**

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

*January 6, 2016*

**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?

*January 5, 2016*

**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.

*January 5, 2016*

**Science**

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

*January 5, 2016*

**Math**

How do I use y=ne^kt formula?

*December 23, 2015*

**Math**

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

*December 23, 2015*

**Math**

What is bacterial growth formula?

*December 23, 2015*

**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.

*December 20, 2015*

**science**

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

*December 14, 2015*

**Math**

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

*December 8, 2015*

**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.

*December 7, 2015*

**chemistry**

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

*December 6, 2015*

**mathmatics**

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

*December 5, 2015*

**calculus**

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

*December 5, 2015*

**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 ...

*December 5, 2015*

**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.

*December 5, 2015*

**Physics**

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

*December 5, 2015*

**Physics**

see other post.

*December 5, 2015*

**chemistry**

what reaction?

*December 5, 2015*

**chem.**

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

*December 2, 2015*

**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?

*December 1, 2015*

**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?

*November 30, 2015*

**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?

*November 30, 2015*

**math**

9 by 6

*November 30, 2015*

**math**

The diagonal of a rectangular storage room is 4 yards long. If its length is 2 times its width, find the dimensions of the room.

*November 29, 2015*

**Social Studies, Ms. Sue, Reed, Check My Work**

I just took the test for connections 1. organize information.

*November 24, 2015*

**Social Studies**

b;saratoga

*November 23, 2015*

**science**

A cube of density 12kg/m cubed is placed in a Eureka tub and releases 0.40m cubed of water. A) What is the edge length of the cube? B) What is the mass of the cube?

*November 23, 2015*

**Chemistry**

anyone have a clue how to do this?

*November 21, 2015*

**Writing**

does anyone know the answers to the unit test, i'm stuck and need help

*November 20, 2015*

**Physics**

Woah

*November 18, 2015*

**Math**

Megan has 9 yards of fabric. If she uses 5/8 of the fabric to make a quilt, how much fabric does she have left?

*November 17, 2015*

**math**

A simple random sample of 800 individuals provides 250 Yes responses.

*November 17, 2015*

**Social Studies (Ms. Sue) Please Proofread**

100% Thank you correct

*November 17, 2015*

**health**

hello can anyone answer these question please?

*November 17, 2015*

**health**

PLEASE HELP 1. One of your friends plays video games for at least six hours each day and gets upset when he has to eat dinner with his family. This is a sign of? a. An anxiety disorder. b. A phobia c. Bipolar disorder d. An impulse-control disorder 2. A phobia is an example of...

*November 17, 2015*

**Science**

my answer would have to be (A) Mrs.Sue do you agree?

*November 13, 2015*

**Science**

here's the real question and then answers The search for identity usually occurs during? a) early childhood b) middle childhood c) late adulthood d) adolescence

*November 13, 2015*

**Chemistry**

how much heat is required to warm 225 grams of water from -50c to 200 c

*November 9, 2015*

**Algebra 2**

LIFE SAVER^

*November 8, 2015*

**Algebra**

How do I solve: Translate "y more than 4 is -36". Then solve the problem. Hope someone could help me out with this annoying question!

*November 8, 2015*

**Calculus**

In a right triangle, the hypotenuse is of fixed length of 15 units, one side is increasing in length by 4 units per second while the third side is decreasing in size. At a certain instant the increasing side is of length 9 units. Find the rate of change of the third side at ...

*November 7, 2015*

**Physics**

A golf ball has a mass of 0.05 kg. It is initially at rest, but after being struck by a golf club it is given a speed of 30 m/s. The club and the ball are in contact for 2 ms (.002 seconds).

*November 6, 2015*

**SCIENCE**

.) Iodine 131 is a radioactive waste product generated in nuclear power plants. It has a half life of 8 days. If 16 grams was released from the Fukushima power plant 32 days ago, how much is left now?

*November 4, 2015*

**math**

9 cm

*November 3, 2015*

**trig**

An airplane is flying in the direction 148° with an airspeed of u = 920 kilometers per hour. Because of the wind, its groundspeed and direction are v = 820 kilometers per hour and 140°, respectively (see figure). Find the direction and speed of the wind.

*November 2, 2015*

**math**

Breanne and Alison finished a 5 km fun run. Alison finished 400 m ahead of Breanne. Breanne ran at an average speed of 7.2 km/h. What was Alison’s time for the race if she ran at a constant rate for the whole race?

*November 1, 2015*

**HEALTH PLZ ITS OVERDUE**

The answers are A, B, B, B, and again, B. Trust me, I did the assessment and got everything right.

*November 1, 2015*

**Trigonometry**

Rusty has a photograph that is 8 inches wide x 10 inches long. She wants to enlarge the photograph to make a poster that is 3 feet wide. How long will the poster be?

*October 30, 2015*

**Math Can Someone explain me about this question**

where did they get the 11ft?

*October 28, 2015*

**Math Can Someone explain me about this question**

Danika has a board that is 4 yards long. How much needs to be sawn off to make the board 2 feet 8 inches long? A) 1ft 4in B)9ft 4in C)8ft 6in D)2ft 6in

*October 28, 2015*

**Astronomy**

sorry me and my mother were having a moment! Yes Mary you can meet mmy mom well not in person.. Ill go get her(she's putting on her bra) one sec

*October 24, 2015*

**Astronomy**

You really want to?

*October 24, 2015*

**Astronomy**

It smells sour and taste like orange juice.

*October 24, 2015*

**Astronomy**

My mom and I !@#$%^& in her bedroom, we get !@#$%^& juice all over her bed.

*October 24, 2015*

**Astronomy**

My moms 30: has big tits and a wide viginia

*October 24, 2015*

**Astronomy**

Im an 11 year old girl...... Im a lesbian heres my secret: My mom lets me !@#$%^& her sometimes

*October 24, 2015*

**Astronomy**

Im into you babe now where's homie?

*October 24, 2015*

**Astronomy**

Mal you still there?

*October 24, 2015*

**Astronomy**

No mary you cant have my address (Im trying to get homie and Mal) My winner is 5ft 2 in long tho (^.^)

*October 24, 2015*

**Astronomy**

WANT MY ADDRESS MY MOM IS A LESBIAN AND WONT HAVE A PROBLEM WITH IT!

*October 24, 2015*

**Astronomy**

NO BABY GIRLS IM 11 AND READY TO !@#$%^&..WANT MY ADDRESS

*October 24, 2015*

**Astronomy**

Oh MAL YOU DONT KNOW ME IM REALLY 11 AND INTO PORN! AND JUST BY YOUR NAME I THINK YOU WOULD BE THE PERFECT PERSON TO !@#$%^&!

*October 24, 2015*

**Astronomy**

HOMIE YOU IN?

*October 24, 2015*

**Astronomy**

WHAT ABOUT YOU HOMIE?

*October 24, 2015*