Thursday

October 27, 2016
Total # Posts: 101,594

**geometry**

Dave had a section of his roof damaged by hail, so he needs to replace the shingles. The roof section can be represented by trapezoid JKLM. How many square feet of shingles must he order?

*July 7, 2016*

**chemistry**

To 100 mL of a 0.1M NH3(Kb=1.8*10-5)solution,200mL of a 0.1M NaOH have been obtained.Calculate the pH of the solution.

*July 7, 2016*

**Math**

(x – 2)^2 + (y + 4)^2 = (x + 1)^2 + (y – 5)^2 x^2 – 4x + y^2 + 8y + 20 = x^2 + 2x + y^2 – 10y + 26 x^2 – 4x + y^2 + 8y + 20 – (y^2 + 8y + 20) = x^2 + 2x + y^2 – 10y + 26 – (y^2 + 8y + 20) x^2 – 4x – (x^2 + 2x) = x^2 + 2x –...

*July 7, 2016*

**General Math**

Jajshsjs

*July 7, 2016*

**pre-calc**

A ball is dropped from the top of a 25-m ladder. In each bounce, the ball reaches a vertical height that is 3/5 the previous vertical height.Determine the total vertical distance traveled by the ball when it contacts the ground for the sixth time. Express your answer to the ...

*July 7, 2016*

**Math**

The fourth term of a geometric series is 30; the ninth term is 960. Determine the sum of the first nine terms. How do I find t1 and r?

*July 6, 2016*

**Chemistry**

correction: no space between amminenitrotrichloride and chromium. sodium amminenitrotrichloridechromium(I)

*July 6, 2016*

**Chemistry**

Na3 = sodium, NH3 = ammine, NO2- = nitro, cl3 = trichloride, cr = Chromium Now chromiums charge is -1+(-3)+3+ chromium= 0. chromium is 1. NH3 is a cation, cl is anion, but we use chromium instead of chromate. Sodium amminenitrotrichloride chromium(I).

*July 6, 2016*

**math**

how do i simplify 3 square root of 5 end root minus 2 square root of 7 end root plus square root of 45 end root minus square root of 28

*July 6, 2016*

**hialeah campus**

Assume that women's heights are normally distributed with a mean of 63.6 and a standard deviation of 2.5 a) If 90 woman is randomly selected, find the probability that they have a mean height between 62.9 and 64.0 inches.

*July 6, 2016*

**math**

In K&M grocery store, apples are sold in groups of 3 and oranges are sold in groups of 5. If Mrs. Winter buys 26 apples and oranges in all how many apples does she buy? How many oranges does she buy?

*July 6, 2016*

**Math**

I am 5 digit number between 20,000 and 40,000. My ten thousand digit is 6 less than in ones digit and my thousands digit is more than my tens digit. My hundred digit is the sum of my ten thousands digit. What number am I?

*July 6, 2016*

**Delta**

According to a previous report, 25% of households had some type of high-speed Internet connection. Suppose 8 households are selected at random and the number of households with high-speed Internet is recorded (a) Find the probability that exactly 3 households have high-speed ...

*July 6, 2016*

**Physics**

A neutral solid conducting sphere of radius R has charge Q deposited in it, and is sitting at the centre of a conducting shell of inner radius 2R and outer radius 3R. After the conductor reaches equilibrium, find the potential at R<r<2R at r=R, and at r=R/2, and r=5/2R.

*July 5, 2016*

**home economics**

Parts of home economics

*July 5, 2016*

**Chemistry 1111**

0.121 M

*July 5, 2016*

**chemistry**

0.02 Moles of HCl were added to a buffer solution, prepared by fluxing 20 L of gaseous NH3 and 10 L of gaseous HCl, both measured in normal conditions, in 2L of water. Calculate the pH of the solution before and after the HCl addition. (Kb NH3 = 1.8 * 10-5).

*July 5, 2016*

**chemistry**

Calculate the pH of a solution containing 10 g / L of NH4Cl (Kb NH3 = 1.8x10-5

*July 5, 2016*

**chemistry**

To 100 mL of a 0.1M NH3(Kb=1.8*10-5)solution,200mL of a 0.1M NaOH have been obtained.

*July 5, 2016*

**chemistry**

Determine the pH of a solution containing 1.00 mol/L of HCN (Ka = 5.00×10–10) and 5.00×10–2 mol/L of HCl.

*July 5, 2016*

**chemistry**

Calculate the pH of a solution obtained dissolving 10 g of NH3 and 15 g of NH4Cl in 300 ml of water (Kb NH3 = 1.8 x10-5)

*July 5, 2016*

**Physics**

In the 0.97F-67-(36.8-0.052F) = M*0 = 0, where the 0.97 came from?

*July 4, 2016*

**Math**

Certain financial aid students must pass 2/3!of their classes in order to continue their aid. If they are taking 18 hours , how many hours do they have to pass

*July 4, 2016*

**ophs**

the hat of a clown is in the form of a cone. the slant height of the cone is 15cm and it makes the angle of 45 degree with the height of the hat. what is the diameter of clown's head ?

*July 4, 2016*

**maths**

a number consist of two digits of which tens digit exceeds the unis digit by 7 the number itself is equal to 10 times the sum of its digit find the number

*July 4, 2016*

**maths**

the digit at the tens place of a two digit number is four times that in the units place if the digits are reversed he new number will be 54 less than the orginal number. find the orginal number

*July 4, 2016*

**math**

two number are such that ratio between them is 3:5 find the orginal number

*July 4, 2016*

**Physics**

angular momentum of a system of particles

*July 3, 2016*

**maths**

the diameter of a biycle wheel is 49 cm. how far will it travel in 50 revolutions?

*July 3, 2016*

**math**

a fish with a mass of 4kg causes a fishing pole to bend 10cm. if the amount of bending (b) varies directly as the mass (m), how much will the pole bend for a 7 kg of fish

*July 3, 2016*

**math**

thnx

*July 3, 2016*

**science**

A lump of ice falls from an airplane as it comes it to land. If the ice hits the ground with a vertical speed of 85 m/s, what was the height of the plane when ice feel off?

*July 2, 2016*

**chemistry**

Determine the pH of a solution containing 1.00 mol/L of HCN (Ka = 5.00×10–10) and 5.00×10–2 mol/L of HCl. It will be the best for me if you give me the answer of this problems.

*July 2, 2016*

**chemistry**

Calculate the pH of a solution obtained by mixing 50 mL of NH3 0.1 M (Kb = 1.8•10–5 mol/L) and 25 mL of HCl 0.2 M.

*July 2, 2016*

**chemistry**

Why and How you took 90 as HCl millimos? Is there any possibility to use ICE table?

*July 2, 2016*

**chemistry**

Calculate the pH of 0.3 M HCl solution. Calculate the pH when 100 mL of a 0.5 M solution of NaOH are added to 300 mL of the HCl solution.

*July 2, 2016*

**chemistry**

Calculate the pH of a solution obtained by mixing of 100 mL of a 10-3 M and 50 mL of a 10-2 M solution of CH3COONa.

*July 2, 2016*

**maths**

the difference of two positive number is 69 the quotient obtained on dividing one by the the other is 4 find the numbers

*July 2, 2016*

**math**

one number is 6 more than the other number also 7 times the smaller number is equal to 6 times the larger number find the two numbers

*July 2, 2016*

**science**

what is i for glucose

*July 2, 2016*

**Math**

It this circumference of a circle is 44cm. find its area

*July 1, 2016*

**Chemistry**

Ammonium phosphate and nickel(II) nitrate solutions are mixed, what precipitates out?

*July 1, 2016*

**Chemistry**

When the equation below is balanced and all coefficients are in the lowest, whole number ratio, the coefficients are: C2H6 + O2 ¨ CO2 + H2O I am currently doing an online worksheet to improve in chemistry and I am not quite understanding how to find the coefficients ...

*July 1, 2016*

**Chemistry**

When the equation below is balanced and all coefficients are in the lowest, whole number ratio, the coefficients are: Bi + O2 ¨ Bi2O3

*July 1, 2016*

**maths**

43-12square root7

*July 1, 2016*

**Math**

If cotA=3/4find the value of 2sinA-3cosA ÷2sinA - 3cosA.

*July 1, 2016*

**Math**

Mike is paid at a rate of 950 per hour for the first 40 hours worked in a week and one and one half times that rate for all hours over 40 if he works 52 1/4 hours in a week what is his gross pay rounded to the nearest cent

*June 30, 2016*

**chemistry/biochemistry**

How can we calculate the HCO3- (bicarbonate ion) concentration in water in 25C pH7.0? I think we can use PV=nRT equation, but I am not sure. If pH is changed from 7.5 to 6.5 ( around pka 6.3 of CO2), how can change the HCO3- concentration? Thanks in advance.

*June 30, 2016*

**English**

Actually, I just checked and it WASN'T B.

*June 30, 2016*

**science**

The least count of a screw gauge is 0.001cm.the diameter of wire measured by it is 0.225cm.find out percentage error in the measurement.

*June 30, 2016*

**Science**

Calculate the no. Off molecules atom in 360gm of water...??

*June 30, 2016*

**Music**

2222222

*June 30, 2016*

**Music**

19. c 20. d

*June 30, 2016*

**math**

find the given equation table 4x+y=9 x y1-3 -1 3 2

*June 30, 2016*

**physics**

A motorcycle/rider combination has a center of mass that is half a meter diagonally upward and in front of the point of contact between the wheel and the road at an angle of 30 degrees when the bike is level. What acceleration is necessary to keep the bike tilted up stably ...

*June 29, 2016*

**Chemistry**

What will the pH of a solution be when 0.5447 L of NaOH (pH = 14.436) is added to 0.357 L of 2.01 M ascorbic acid (H2C6H6O6)? Not sure how to do this.

*June 29, 2016*

**Algebra**

My question is related to this algebra question. Could you kindly explain how did you get the father's age? Pls.

*June 29, 2016*

**U.S History**

How much did the availability of resources aid in industrialization? Why?

*June 29, 2016*

**Math**

Workers in a certain company are required to 8% of their salary into a social security fund. Mr Doe has a monthly salary of GH¢22.00 . How much does he pay into the fund every month? And every year?

*June 29, 2016*

**Algebra**

car a leaves phoenix heading north at a constant speed of 40mph car b leaves two hours later and follows car a at a constant speed of 54 mph how many hours does it take car b to catch up to car a? algebra

*June 29, 2016*

**Differential Calculus**

It this circumference of a circle is 44cm. find its area

*June 28, 2016*

**math**

Spoon

*June 28, 2016*

**math**

grassland-29% wilderness-9% urban-2% wetlands-3% forest-30% cropland-17% if humans use half of forest and grassland plus all cropland and urban areas how much land is used by humans. is it 48.5%

*June 28, 2016*

**math**

if 2sinx=1,π÷2<x<π and √2cosy=1, 3π÷2<y<2π, find the value of tanx + tany÷ cosx - cosy

*June 28, 2016*

**maths**

A projectile is thrown with a velocity of 2om/s at an elevation 30Â°.Find the greatest height attained and the horizontal range.

*June 28, 2016*

**math**

i have four hundreds. i have one more tens than i have hundreds. i have eight ones. what number am i?

*June 28, 2016*

**Physics**

How much kinetic energy does the electron gain?

*June 28, 2016*

**Calculus**

11522122020

*June 28, 2016*

**Calculus**

Use implicit differentiation to find the derivative of y with reapect to x x^2y-y^2+ln(xy)=1

*June 28, 2016*

**rio hondo**

f(x)=7x2+x+2

*June 27, 2016*

**english**

No one has ever seen me, nor ever will. I never was, but am always to be. Yet everyone waits for me, either in hope or in terror, for they always know I will come. What am I?

*June 27, 2016*

**chemistry**

why did you take 0.1M? Why don't you multify with volume in the first step?

*June 27, 2016*

**chemistry**

sorry,for the mistake. To 200mL of a 0.1M solution of a CH3COOH (Ka=1.8 x 10-5) 70mL of a 0.2M solution of NaOH have been added.calculate the pH before and after the NaOH addition.

*June 27, 2016*

**literature and the arts**

thanks Sue :)

*June 27, 2016*

**Bio**

Which of the following best describes the influence of latitude on climate? A. Temperate regions receive more solar energy and heat per unit area than tropical regions. B. Polar regions receive less solar energy and heat per unit area than tropical regions. C. Earth's ...

*June 27, 2016*

**hhs**

ml;

*June 27, 2016*

**language arts**

Which sentences are punctuated correctly? Check all that apply. The cake (that I made for my mother’s birthday) was dark chocolate. The nurse, who was kind and compassionate, bandaged my thumb. F. Scott Fitzgerald was a famous writer—who inspired many great films. ...

*June 27, 2016*

**Math**

The nutritionistof FLC Foods, Inc. designed a new product for everybody's consumption and believes that the variable cost in producing the said product is Php950.00 per unit and the fixed cost is Php60,000. Write the total cost as function of the product sold. If the ...

*June 27, 2016*

**yogi science **

HOW are all living things alike ?

*June 27, 2016*

**Urgent help here! Math**

I don't know

*June 27, 2016*

**hindi**

vigyapan on paints, new hospital opened in your town, musical instruments

*June 27, 2016*

**physics**

a car travelling at 60km/h uniformly retards for 10s and reaches a velocity of 45km/h. find the retardation.

*June 27, 2016*

**physics**

an object undergoes an acceleration of 10m/s2 starting from rest. find the distance travelled by it in seconds

*June 27, 2016*

**write a paragraph**

produce,reproduce,process,production,assembly line,lead actor,animation,hire

*June 27, 2016*

**math**

if 359=sum 17 how can the unknown next number be 966=sum 21

*June 26, 2016*

**music art **

The renaissance concided with Van eycks paintings lack any refrencesto this

*June 26, 2016*

**Algebra help**

Please help me compute how to draw a graph after I receive the answer. The problem I have is physically connection the graph.

*June 26, 2016*

**Grammar**

We made too many wrong mistakes

*June 26, 2016*

**Maths**

The measure if one angle of a parallelogram is 25 degree . Find the measures of the other 3 angles

*June 26, 2016*

**chemestry**

To 400mL of a 0.1 M CH3COOH solution(Ka=1.8 x 10-5),two subsequent additions of 100mL of 0.2 M NaOH solution have been done.determine the solution pH after each addition. Drbob,I don't understand this problem how to solve.Can you help me and give me the full calculation.

*June 26, 2016*

**Math**

When the teacher buys tennis rackets for his gym class, he must buy five more than three times as many tennis balls. Rackets cost $20 each and ball cost $1.50 each. How much does the teacher spend if he needs 17 tennis rackets?

*June 25, 2016*

**biology**

31. A student conducts an investigation in which she dissolves 1 gram (g) each of several substances in 50 milliliters (ml) of water. She has 12 identical plastic cups of water. She places 1 g of salt in three cups, 1 g of sugar in three cups, and 1 g of baking soda in three ...

*June 25, 2016*

**Chemistry **

64g of oxygen reacts completely with methane gas to form 44g of carbon dioxide gas and 36 g of water vapour. Calculate the amount of methane that takes part in the reaction .

*June 25, 2016*

**Math**

If 2 times the square of a number is equal to the 6 times the number,find the number

*June 25, 2016*

**chemestry**

calculate the pH of the 120mL of a 0.12 M HCOONa,Ka=1.8*10^-5,solution are added to 50mL of a 0.05 M H2SO4 solution.Determine the pH of the sodium formate solution before and after the H2SO4 addition. please someone help me!

*June 25, 2016*

**pysics**

128 km/hr * 1 hr/3600 s * 1000 m/km 128 km/hr * 0.62137119224 mi/km

*June 25, 2016*

**physics**

work done against gravity = 50*9.81 *20 total work done, add 200 J to above efficiency = 100 * work against gravity/total work I do not know tension in line because I do not know how your five blocks are arranged.

*June 25, 2016*