# Posts by bob

Total # Posts: 3,253

**statitics**

75

**math**

find a such that f(x)= ax2-4x+3 has a maximum value of 12

**math**

find a such that f(x)= ax2-4x+3 has a maximum value of 12

**calculus**

Find the area of the region lying inside the polar curve r = 2(1 − cos theta) and outside the polar curve r + 4 cos(theta)= 0.

**calculus**

Find the area of the region lying inside the polar curve r = 2(1 − cos theta) and outside the polar curve r + 4 cos(theta)= 0.

**calculus**

find the area of the region bounded by the polar curve r=sqrt(6ln(theta)+3 as well as the rays theta=1 and theta=e

**psychology**

dont know

**Algebra 2**

Let (x1,y1) be a solution, other than (0,0), of a direct variation equation. Write an second direct variation equation whosegraph is perpindicular to the graph of the first equation.

**Physics**

Two identical point charges are fixed to diagonally opposite corners of a square that is .5m on a side. Each charge is 3.0E-6 C. How much work is done by the electric force as one of the charges moves to an empty corner?

**Science**

A mixture of 10.902 g if iron(II) oxide and 6.524 g of aluminum metal is placed in a crucible and heated in a high temperature oven, where a reduction of the oxide takes place: 3 FeO(s) + 2Al(ℓ) ! 3 Fe(ℓ) + Al2O3(s) . What is the limiting reactant? What is the ...

**Chemistry**

1.19 atm

**chemistry**

express liquid pentanol and gaseous oxygen as a chemical reaction

**math**

andy has 23 coins worth 3.65 consisting of only quarters and dimes.how manydimes does he have?

**VESPR theory**

But is a molecule with an electronic geometry of tetraheydral and a molecular geometry of bent the only one like that? Why doesn't a square pyramidal have <120 degree angles when it has a lone pair? Or does it? I feel like more of the bond angles should be less than the...

**VESPR theory**

On one of my pages of notes, it lists all the different shapes and the bond angles that go along with them. Next to bent (2 lone pairs, 2 bonds), it says <109.5 degrees for bond angles. I don't understand why that one is less than 109.5, when a trigonal pyramidal isn&#...

**VESPR theory**

Is a bent tetraheydral the only shape that doesn't have a precise angle (as in it's less than 109.5 degrees)?

**English**

its b

**Physics**

Forgot to put my question at the end of it XD This is from me trying to interpret what you've done in the previous times this question has been asked, but obviously, I'm wrong somewhere. At what point in the work am I messing up?

**Physics**

Let me try to clarify v1=22.222 m/s v2=13.278 m/s x=vi(t)+1/2a(t^2) 56.7=22.222t+1/2a(t^2) 24.4=13.278t+1/2a(t^2). Through elimination 32.3=8.94t t=3.611s From there I separated to -vi=at as vf is 0 -22.222=a(3.611) -13.278=a(3.611) -35.5=7.222a a=-4.92 m/s^2

**Physics**

To stop a car, you require first a certain reaction time to begin braking. Then the car slows under the constant braking deceleration. Suppose that the total distance moved by your car during these two phases is 56.7 m when its initial speed is 80.0 km/h, and 24.4 m when the ...

**calculus**

Find the sum of the series (-1)^n (5^(2n))/n! 1. sum = e^25 2. sum = e^−5 3. sum = 5 4. sum = e^5 5. sum = 25 6. sum = e^−25

**calculus**

017 10.0 points Lance Armstrong is moving with speed 35 feet/sec and acceleration 4 feet/sec2 when he crosses the starting line of a stage in the Tour de France. Use a degree two Taylor polynomial T2(t) to estimate how far he travels in the next second. 1. distance = 38 feet 2...

**1st grade**

2 bones + 3 dogs is 5 objects or 2 bones - 3 dogs = -1 bones

**Chemistry**

What is the chemical equation for white flour? Thanks!

**Chemistry**

How many molecules are in 2.6 grams of H2O?

**phy**

a=6750

**science**

middle letter is b but cant find the stupid answer!

**calculus**

With power series, is an endpoint convergent if you plug it back into the original series, and get an alternating series that is conditionally convergent?

**Chemistry 1145**

These UV photons can break chemical bonds in your skin to cause sunburn—a form of radiation damage. If the 310 nm radiation provides exactly the energy to break an average chemical bond in the skin, estimate the average energy of these bonds in \rm kJ/mol.

**Algebra 1**

trtyrt

**Geometry**

The perimeter of a regular pentagon is 31 cm. Find the length of each side.

**Math**

z x 12 = 60

**science**

2000

**math**

75Z% lil lames

**physics 2**

yo mama

**physics**

Aerial skiing involves speeding down a steep ramp that curves sharply upward at the end to launch the skiers into the air. Once airborne, the skier twists and turns in complex combinations to score points in the competition. Consider an aerial launch ramp that has a final ...

**calculus**

The sum from n=1 to infinity of cos(npi/3)/n! Does this absolutely converge, conditionally converge, or diverge?

**Chemistry**

69

**cjs 230**

I need some information for the project that I can use not word for word in my own words.

**cjs 230**

I need help with my final project in cjs/230

**phy**

This question is impossible u should just quit

**Biology**

Wow, your no help Sra

**AP Chemistry**

You're all jerks 4 isn't the answer

**health**

What would be the major steps in implementing electronic health record proposal? I have some ideas are they right? planning commitmment of staff active involvement training

**health**

Describe a place where organizations share information among competitors electronically.

**chemistry**

A 281 lb fullback runs the 40 yd dash at a speed of 23.0 ± 0.1 mi/h.(a) What is his de Broglie wavelength (in meters)?(b) What is the uncertainty in his position? i determined the wavelength correctly, but how do you determine the uncertainty

**Chemistry**

8.6*10^-19

**5th grade economics**

i am a 4-digit number greater than 9000. My hundreds digit is twice than ny ten digit. My ones digit is greater than my tens digit. The sum of my digit is 20. What number am i?

**math**

a person has $4 in nickles, quarters, and dimes. there is a total of 36 coins altogether. the number of quarters is 4 less then the number of dimes. Algerbaicly determine the number of each type of coin using a system of 3 equations with 3 variables.

**science**

What are the chemical elements in citric acid?

**math**

how many differnt ways can 50 players in a marching band be arranged in rectanagle arrangement?

**chemistry**

Calculate the specific heat (\rm{J/g \; ^\circ C}) for a 18.5-\rm g sample of tin that absorbs 183 {\rm J} when temperature increases from 35.0 ^\circ \rm C to 78.6 ^\circ \rm C

**8th grade Math**

what is more dense 14cm3 or 8cm3

**math**

I can't find the variable and expression for the poulation of oakland. Here's something to help you with Oakland, California is 5,417 less than the poulation of omaha, nebraska.

**english**

LOL! Is this for the Dillon's gift card?

**math**

andy and kate are running around a 400 meter track. if they run in the same direction. andy will pass kate in 100 secounds. if they run in the opposite direction they will meet in 25 seconds. what is andys velocity in meters per seconds?

**Physics**

The problem contains graphics that I don't know how to show other than in an image format: h t t p : / / b i t . l y / c D H P V M h t t p : / / b i t . l y / 9 m b y C R

**Physics**

A long jumper jumps at a 45 degree angle towards the right bank which is 10.0 m away horizontally and 2.5 m vertically below. How long, or short, of the opposite bank will she land?

**Algebra 2 URGENT PLEASE HELP**

h t t p : / / b i t . l y / b z p B K 9

**Algebra 2 URGENT PLEASE HELP**

f(x1)=y1 ------------ f(-1)=1 So x1=-1 and y1=1 f(x2)=y2 ------------ f(1)=-2 So x2=1 and y2=-2 We have two points: (x1, y1) and (x2, y2) = (-1, 1) and (1, -2). The slope between those two points is (y2-y1)/(x2-x1) = (-2-1)/(1-(-1)) = -3/2 = m The equation for a line is (y-y1...

**physics**

How far does the object travel during this time?

**physics**

An object with an initial velocity of 5 m/s accelerates uniformly for 15 s. (a) If the final velocity is 37 m/s, what is the acceleration?

**geometry**

Make a conjecture about the next item in the sequence:2-6,18,-54

**6th grade math**

How can you cut 3 sandwich for 8 people

**math**

a 9 percent salt water solution is mixed with 4 oz. of an 18 percent salt water solution in order to obtain a 15 percent salt water solution. how much of the first should be used?

**analogy**

dock is to what as park is to garage? open is to close as retreat is to what?

**9th grade**

what does it mean to name the intersection of the planes in a triangular prism

**Math**

6/5hrs

**Math**

Solve: 5g² - 13g + 6 = 0

**physics**

A certain airplane has an acceleration of 15.0 m/s2 How fast will it be moving2.5s after it starts down runway How far down runway during the 2.5s

**Algebra**

-1<5-2p<5

**math**

drove from rich to boston at avg speed of 50 mph,if it took 5 hrs to drive from rich to phila at an avg speed of 70 mph and if the whole trip took 13 hrs how far is it from phila to boston?

**algebra**

(1/t-1)-(1/t+2)

**math**

what is range

**12th grade maths**

5/6=1/3-x please solve

**physics**

41.209

**math**

how many ways are there to chose a three digit lottery number? numbers like 003,014,222,232 or 123 are all allowed.

**math**

suppose T is a right angle whose sides have a b c. is it possible that each of a b c is an odd integer?

**arithmetic**

In a certain arithmetic sequence, t6 + t15 = –141 and the common difference is –7. What is the first term of the sequence? explain how to do this please

**calculus**

12X12x14

**math**

the digits of a two digit number are reversed. when both of these numbers are added the result is 88 and when subtracted the result is 54. the original two digit number contains which of the following digits 2 3 5 or 7

**Chemistry**

Don't you mean divide? Don't you get L^2mol /mol^2 Lxs The thing is idk if it can be reduced to L/molxs or A) Can it?

**Chemistry**

What would the units of the rate constant k be in a second order equation if rate was measured in mol/(L x s)and all concentrations in mol/L a)L/(mol x s) b)L2/(mol2 x s) c)L3/(mol3 x s) d)mol2/(L2 x s) I think it's b) but d) is very tempting

**Chemistry**

When zinc, iron and lead are reacted with hydrochloric acid the variable most easily measured in order to determine the effect of the chemical nature of the reactants on reaction rate is a)temperature b)colour c)surface area d)volume of gas e)concentration Think it's d. Am...

**Chemistry**

What is the overall order of reaction for the elementary system A+2B=products? a)0 b)1 c)2 d)3 e)5 Can somebody explain this question to me. I don't get it.

**Chemistry**

So the answer is a?

**Chemistry**

Consider the following two thermochemical equations N2+2.5O2-> N2O5(s) Delta H=xkJ N2+2.5O2-> N2O5(g) Delta H=ykJ The enthalpy change in kJ for the sublimation of one mole of N205 solid to gas would be represented by the quantity a)x+y b)x-y c)y-x d)-x-y Assuming it'...

**Chemistry**

Can you explain why you have to subtract the other way?

**Chemistry**

I thought what your suppose to do is -1275 - ((-875) + (-283))= -117kj/mols Don't u just subtract? To find the difference?

**Chemistry**

The molar enthalpies of combustion of CH3COCOOH(l)CH3COOH(l) and CO(g) are respectively -1275kJ/mol, -875kJ/mol, and -283kJ/mol. What is the enthalpy change for the reaction below? CH3COCOOH= CH3COOH +CO a)1867kJ b)-1867kJ c)117kJ d)-117kJ e)-2433kJ I think it's d)

**chemistry**

I don't know

**Chemistry**

The pressure of a gas is 35 atm at a temperature of 48 (degrees) C with constant volume. What will the new pressure be if the temperature is increased to 36 (degrees) C?

**Finance**

if you bought 12,000 shares of stock at .50 per share and the stock falls to .25 per share how many additional shares would you have to buy to get your bottom line down to .25

**algebra**

Invest $5,000 in a savings account at 6.6% interest compounded monthly

**math**

weighted coin has property that heads comes up 60 percent of time. two flips of coin is it more likely that outcome from two flips are the same or outcome from two flips are different?

**geometry**

How many hours will it take a bicyclist traveling 17.6 feet per second to finish a 90-mile race? Round your answer, if necessary, to the nearest tenth.

**geometry**

Why don't parallel lines exist in elliptical geometry?

**GEOMETRY**

A __________ __________ touches every vertex exactly once, but does not return to its origin. ________________________________________ A. Hamiltonian circuit B. Hamiltonian path C. Euler circuit D. Euler path

**GEOMETRY**

Which of the following are measurements of the sides of a right triangle? ________________________________________ A. 3, 4, 5 B. 28, 26, 12 C. 17, 14, 6 D. all of the above

**geometry**

Which of the following are measurements of the sides of a right triangle? ________________________________________ A. 3, 4, 5 B. 28, 26, 12 C. 17, 14, 6 D. all of the above