# Posts by jk

Total # Posts: 104

**math**

2 Years before,average age of 8 numbers of family was 20yr.if present average of family even on inclusion of 1 child,remains same.present age of child is?

**math**

Each student in a class contributed as many paise as number of student in the class.teacher contributed rs 13 to make total collection of rs 49.how many students were in the class?

**math**

Distance between 2 villages A and B is 165km.a scooter rider starts from A to B at 75km at speed of 320km/hr.at the same time another scooter rider starts from B towards A at speed of 25km/hr.find when they will cross each other? ( 10 am)?

**science**

21

**Maths**

Find x such that the point (x,4) is 10 units from (-2,-2)

**english**

I consider that cosmetic surgery is a personal option but in some cases it becomes a bad addiction because expand this please

**Algebra**

For the function f(x) = 5/x+4 find the average rate of change of f from 1 to x:

**chemistry**

what products would form after hydrogenation of 2-methyl-1-butene? after halogenation (cl2)?

**AP chemistry**

what products would form after hydrogenation of 2-methyl-1-butene? after halogenation (cl2)?

**chemistry**

what products would form after hydrogenation of 2-methyl-1-butene? after halogenation (cl2)?

**precalculus**

use the discriminant to determine whether the equation is a parabola, an ellipse, or a hyperbola. Then identify the angle of rotation required to eliminate the xy-term. x^2+4xy+y^2=1 5x^2-6xy+5y^2-8x+8y-8=0 9x^2+24xy+16y^2=25

**precalculus**

find the eccentricity to identify the conic, then sketch the conic and its directrix r=1/1-cos theta r=2/3+2 sin theta r=4/1-2 cos theta

**precalculus**

find the eccentricity to identify the conic, then sketch the conic and its directrix r=1/1-cos theta r=2/3+2 sin theta r=4/1-2 cos theta

**precalculus**

find directrix of 1/1-cos theta

**precalculus**

so its y^2-2y=x not solving for y?

**precalculus**

how do you eliminate the parameters for x=1-t^2 and y=1+t?

**pre-calculus**

find directrix of 2/3=2 sin theta

**pre-calculus**

how do you eliminate the parameters for x=1-t^2 and y=1+t?

**pre-calculus**

i didn't get a circle by using 0, pi/6, pi/4, pi/3, and pi/2?

**pre-calculus**

how to graph equation?

**pre-calculus**

what is the graph for this equation?

**pre-calculus**

why squared?

**pre-calculus**

eliminate parameters of x=1+cos t y=1-sin t graph the parametric equations

**precalculus**

find an hyperbola equation with foci (0, +/-8) and asymptotes; y=+/-1/2x?

**precalculus**

find a hyperbola equation with vertices (o,+-4) and passes through the point (3,-5)

**math**

1.4 because u have to divide 5 divide 7.

**chemistry help**

a 3.54 grams solid sample of an unknown monoprotic acid was dissolved in distilled water to produce a 47.0 mL solution at 25 degrees. This solution was then titrated with 0.2 M NaOH. The equivalence point was reached when 35.72 mL of 0.2 M NaOH was delivered. A. find the ...

**chemistry help**

In the following questions, assume that no excess distilled water was added from a wash bottle during the titration of 10.00 mL of vinegar with your standardized solution of NaOH. A. calculate the pH of vinegar. B. what was the pH of the solution after 4.00 mL of titrant was ...

**chemistry help**

A 15.00 mL sample of an unknown monoprotic weak acid solution is titrated with 0.35 M NaOH. The initial buret reading is 0.23 mL. The phenolphthalein indicator turns the solution light pink when the buret reads 29.58 mL. B. How many moles of NaOH were delivered? C. How many ...

**chemistry**

you cant solve it?

**chemistry**

In the following questions, assume that no excess distilled water was added from a wash bottle during the titration of 10.00 mL of vinegar with your standardized solution of NaOH. A. calculate the pH of vinegar. B. what was the pH of the solution after 4.00 mL of titrant was ...

**chemistry**

A 15.00 mL sample of an unknown monoprotic weak acid solution is titrated with 0.35 M NaOH. The initial buret reading is 0.23 mL. The phenolphthalein indicator turns the solution light pink when the buret reads 29.58 mL. A. what volume of 0.35 M NaOH was delivered? B. How many...

**chemistry**

finding all the answers

**chemistry**

a 3.54 grams solid sample of an unknown monoprotic acid was dissolved in distilled water to produce a 47.0 mL solution at 25 degrees. This solution was then titrated with 0.2 M NaOH. The equivalence point was reached when 35.72 mL of 0.2 M NaOH was delivered. A. find the ...

**easy math**

√(100 - 20√5 + 5 + 15 - 6√15 + 9) solve.

**precalculus help**

Let z1=2(cos 2pi/3+isin 2pi/3) what are z1^(1/3)? do not even know how to apply demoivre theorem?

**precalculus**

algebraically identify the symmetries of r=2sin(2theta)

**Philosophy**

evolbiol.ru/blankslate/blankslate.htm

**precalculus**

Let u have a length of 20 and direction of 60 degrees, and v= 5i-3j what is u? what is abs(2v-u)?

**precalculus**

Let z1=2(cos 2pi/3+isin 2pi/3) what are z1^(1/3)?

**precalculus**

Let u= <3,1> and v=<6,-1> A. what is the angle between u and v? B. find projvU C. reoslve u into u1 parallel to v abd U2 perpendicular to v.

**us history**

free soil party

**precalculus**

B. find projected vU C. resolve u into u1 parallel to v and U2 perpendicular to v.

**precalculus**

Let u= <3,1> and v=<6,-1> A. what is the angle between u and v? B. find projvU C. reoslve u into u1 parallel to v abd U2 perpendicular to v.

**precalculus**

what are those numbers in radians

**precalculus**

no not at all

**precalculus**

Let z1=2(cos 2pi/3+isin 2pi/3) what are z1^(1/3)?

**precalculus**

solve the rest because i am not getting correct answer?

**precalculus**

Let u have a length of 20 and direction of 60 degrees, and v= 5i-3j what is u? what is abs(2v-u)?

**chemistry**

calculate the pH after 0.02 mol NaOH is added to 1.00 L of .1 M sodium propanoate NaC3H5O2

**chemistry**

PH of gatorade and body sweat

**Grade 11 Chemistry**

find the moles of each element then divided by total volume

**SUPER HARD CHEMISTRY**

a solution containing 100.0 mL of 0.135 M CH3COOH (ka=1.8E-5) is being titrated with 0.54 M NaOH. calculate the ph: at the equivalence point

**HARD COLLEGE CHEMISTRY**

thanks

**HARD COLLEGE CHEMISTRY**

a solution containing 100.0 mL of 0.135 M CH3COOH (ka=1.8E-5) is being titrated with 0.54 M NaOH. calculate the ph: at the equivalence point and 5 mL past the equivalence point. how much is 5 mL past? i do not know how to do it?

**COLLEGE CHEMISTRY HARD**

a solution containing 100.0 mL of 0.135 M CH3COOH (ka=1.8E-5) is being titrated with 0.54 M NaOH. calculate the ph: at the equivalence point and 5 mL past the equivalence point. how much is 5 mL past? i do not know how to do it?

**COLLEGE CHEMISTRY HARD**

jai i still need help

**COLLEGE CHEMISTRY HARD**

calculate the ph at the equivalence point for the titration of 0.01 M Ch3COOH with 0.1 M NaoH ka= Ch3Cooh 1.8E-5 idek how to do it?

**college chemistry HARD**

thanks

**college chemistry HARD**

I STILL NEED HELP WITH EQUIVALENCE POINT WITH THIS PROBLEM

**college chemistry HARD**

a solution containing 100.0 mL of 0.135 M CH3COOH (ka=1.8E-5) is being titrated with 0.54 M NaOH. calculate the ph: at the equivalence point and 5 mL past the equivalence point. how much is 5 mL past? i do not know how to do it?

**chemistry**

calculate the ph at the equivalence point for the titration of .1 M NH3 and .1 M HCl. kb NH3= 1.8E-5 how you do it?

**chemistry**

calculate the ph at the equivalence point for the titration of 0.01 M Ch3COOH with 0.1 M NaoH ka= Ch3Cooh 1.8E-5 idek how to do it?

**chemistry**

a solution containing 100.0 mL of 0.135 M CH3COOH (ka=1.8E-5) is being titrated with 0.54 M NaOH. calculate the ph: at the equivalence point and 5 mL past the equivalence point. how much is 5 mL past? i do not know how to do it?

**math - exponent laws**

now you mention,yes I could have paste the link but i didn't think of it, SORRY! Thank You very much!

**math - exponent laws**

evaluate -(11/17^-10/(9/5)^(1/10) answer from Reiny: (-11/-17)^-10 = 1/(11/17)^10 = 77.725... (I stored that in A on my calculator) (9/5)^(1/10) = 1.0605.. so -(11/17^-10/(9/5)^(1/10) = -77.725... /1.0605... = -73.28837824 --- do we need to reciprocal -(11/17) to -(17/11) ?

**MATH - exponent laws**

do we need to reciprocal -(11/17) to -(17/11) ?

**MATH - exponent laws**

how do you evaluated this? (-)sign ↓ _ __________( -11/-17)^-10 line is divide (9/5)^1/10

**Calculus**

oi

**math**

Sam bought a new car for $26,500. The car depreciates approximately 13% of its value each year. A) What is the decay factor for the value of this car? b) Write an equation to model the decay value of this car? c) What will the value of the car be in 10 years?

**Math**

angles ABC and XYZ are complementary angles. if m < ABC is 18 more than three times m < XYZ, find < XYZ i have no idea how to do this i know that something has to equal 18+ 3m but i don't understand the (<) sings

**Math**

4*3 8*9

**Science**

Thanks Kiki!!!!

**chemistry**

Where is an electron in 3Py orbital most likely to be found and where does the probability it vanish?

**Physics (mechanics)**

A u-control airplane of mass m is attached by control wires of length L and negligible mass to the "pilot" who controls the lift provided by the wing FL. The wires control the plane's elevator or angle of attack. The plane's engine keeps it moving at constant...

**Alan**

could anyone test ACDE??

**physics**

exercise 4.1 suppose the pilot start agin from rest

**parallelograms**

52.2

**geometry**

there are 4 cirlces in an equilateral triangle with sides equal to 16cm. what is the radius of the big circle and the little circles

**Economics**

jk

**physics**

jk

**chemistry**

for empirical formula C=3.97mg; H=0.44mg; and O=5mg-3.97mg-0.44mg=0.59mgO Then 0.59mg/16g=0.036mmol. Then you good to go! Thank you DrBob222:D

**chemistry**

I got the right answer by following DrBob222's step

**math**

50

**Math**

998

**Finance**

102,857

**Understanding percent**

In the square, if part A is 1/4 of the square and part C is 1/10 of the square, what percent of the square is part B?

**Poop**

Yo JK just kid in yo!!!!! Got any poopy patties

**English**

Vinegar (by Roger McGough) sometimes i feel like a priest in a fish and chips queue quietly thinking as the vinegar runs through how nice it would be to buy supper for two (1967) Poem for Roger McGough (by Adrian Henri) A nun in a supermarket standing in the queue Wondering ...

**english**

Vinegar (by Roger McGough) Poem for Roger McGough (by Adrian Henri) sometimes A nun in a supermarket i feel like a priest standing in the queue in a fish and chips queue Wondering what it’s like quietly thinking To buy groceries for two. as the vinegar runs through (1967...

**Physics 203**

7890

**Probability**

27

**Chemistry**

How many moles of oxygen atoms are contained in 1.86 x 10-2 mol CuSO4·5H2O

**Physics 3**

ip

**Algebra 1**

Nico drives from school to the store at 25 miles per hour. He drives back to the school (along the same route) at 35 miles per hour, and the returns to the store (via the same route) travelling at 40 miles per hour. Find the average rate for the three trips. Round your answer ...

**Organic Chemistry**

Benzyl chloride, through a primary halide, readily a precipitate when treated with 2% ethanolic silver nitrate. Why?

**math**

A ferris wheel is 35 meters in diameter,and can be boarded at ground level. The wheel turns in a counterclokcwise direction, completing one full revolution every 5 minutes. Suppose that a t=0 you are in the three o'clock position. Write a formula, using the sine function ...

**math**

sinx+ siny/ (cosx+cosy)= tan 1/2 (x+y) prove this identity

**Physics Help**

velocity

**math**

5