# Posts by Matthew

Total # Posts: 678

**Chemistry**

If 50.00 mL of 0.250 M barium nitrate are combined with 50.00 mL of 0.400 M sodium sulfate, how any grams of precipitate will form? I'd really appreciate it if someone could walk me through this problem. I don't want the answer, I just want to have a hint at which ...

*March 12, 2017*

**English**

1. D 2. TRUE 3. C 4. C 5. TRUE 6. B 7. A, C, & D 8. A, B, C, E, & G 100% correct.

*January 5, 2017*

**English**

#1 is D.

*January 5, 2017*

**pre calc**

write the equation in the slope-intercept form 8x ? 3y + 6 = 0

*January 4, 2017*

**History**

You're a bit late. But thanks Ms. Sue

*December 16, 2016*

**History**

PLEASE HELP!!! What role did the city of Wittenberg, Germany play in the renaissance?

*December 16, 2016*

**Math**

Check** Not 'chack'

*December 15, 2016*

**Math**

PLEASE CHACK MY ANSWER!!! Discussion for Applications of Linear Systems When solving a system of equations, how do you determine which method to use? My answer: I determine which method to use by looking at the equations. If both equations are in slope-intercept form, I choose...

*December 15, 2016*

**very hard PHYSICS QUESTION**

Consider a solid ball of mass m = 50g and is placed on a long flat slope that makes an angle of 30° to the horizontal. The ball was initially at rest and was then released such that it rolled down the slope without slipping. With a detailed explanation of your method ...

*November 21, 2016*

**Physics**

query=a stone of mass 30grams is placed in a measuring cylinder containing some water. the reading of the water level increases from 50cm cubic to 60cm cubic. what is the density of the stone?

*November 10, 2016*

**Algebra**

you are the manager of a firm that produces two products X and Y at zero cost. there are three types of consumers(1000 of each type) with the following valuations of the two products. consumer type Product X($) ProductY($) 1 90 60 2 70 140 3 40 160 What are your profits if you...

*October 27, 2016*

**Science-physics**

A bottle weighs 35g when empty,95g when filled with water and 119g when filled with an organic liquid. What is the capacity of the bottle: A-60cm cube B-84cm cube C-130cm cube D-154cm cube

*October 26, 2016*

**Math**

A submarine at -28 feet dives 40 feet. What is the submarine's elevation after the dive?

*October 23, 2016*

**Chemistry**

A sample of cobalt, A, with a mass of 5g is initially at 25 degrees Celsius. When this sample gains 6.70J of heat, the temperature rises to 27.9 degrees Celsius. Another sample of cobalt B with a mass of 7 g is initially at 25 degrees Celsius. If sample B gains 5 J of heat, ...

*October 17, 2016*

**social studies**

Mrs. Sue I need your help. Which statement BEST describes the power of government provided by the Articles of Confederation? A) The national government held most of the power. B) Congress enforced its power by taxing the states. C) The states had more power than the national ...

*October 12, 2016*

**art**

Its 1b 2 d 3 a just took the test 100% correct i promise

*October 5, 2016*

**Math**

All the odd numbers from 51 to 5001 are written. What is the total number of digits used?

*October 4, 2016*

**math probability**

Assume that every time you buy an item of the Hong Kong Disney series, you receive one of the four types of cards, each with a cartoon character Mickey, Minnie, Donald and Daisy with an equal probability. Over a period of time, you buy 6 items of the series. What is the ...

*September 27, 2016*

**Algebra**

A rock is thrown upward with a velocity of 21 meters per second from the top of a 48 meter high cliff, and it misses the cliff on the way back down. When will the rock be 7 meters from the water, below? Round your answer to two decimal places.

*September 21, 2016*

**Health**

I thick c

*September 6, 2016*

**Math**

Find the area of each triangle with the given dimensions Base=3 centimeter, height =3centimeter

*June 28, 2016*

**Ecology**

an endemic species is best defined as a species that

*June 5, 2016*

**Math**

Please help me with that test!!

*May 19, 2016*

**Physics**

A charge of -5.02 μC is traveling at a speed of 8.86 × 106 m/s in a region of space where there is a magnetic field. The angle between the velocity of the charge and the field is 54.6o. A force of magnitude7.85 × 10-3 N acts on the charge. What is the ...

*May 17, 2016*

**Chemistry**

What is the molar mass of toluene if 0.85 g of toluene depresses the freezing point of 100 g of benzene by 0.47 degrees celsius? Kf= 5.12 C/m

*May 6, 2016*

**math**

A crowd of people is watching a live TV show in an auditorium. Section B of the auditorium has eight rows of seats. Each row has 10 seats. If 75 percent of Section B is occupied, how many people are seated in that section?

*April 25, 2016*

**Chemistry**

At 350 K, Kc = 0.142 for the reaction 2 BrCl(g) ⇀↽ Br2(g) + Cl2(g) An equilibrium mixture at this temperature contains equal concentrations of bromine and chlorine, 0.077 mol/L. What is the equilibrium concentration of BrCl?

*April 23, 2016*

**math**

you and your friend are selling tickets to a charity event. you sell 9 adult and 13 student tickets for 212 dollars. your friend sells 4 adult and 15 student tickets for 168 dollars. what was the cost of a student ticket.

*March 29, 2016*

**Physics**

Bob (80 kg) lands with a resultant GRF of 1200 N at an angle of 80 degrees from the horizontal. What was his vertical acceleration during landing? If his vertical velocity at initial contact of landing is 3.0 m/s, how much work is required to bring his body to a complete stop...

*March 20, 2016*

**Physics**

Bob (80 kg) lands with a resultant GRF of 1200 N at an angle of 80 degrees from the horizontal. Round answers to nearest whole number. What was his vertical acceleration during landing?

*March 20, 2016*

**Functions, graphs**

f(x)=(x+1)/(1+x^2) a) explain why the graph lies above the x axis on the interval x=0 and x=sqrt(3) b)write an expression using the indefinite integral that gives the area between the graph f and the x axis between the values x=0 and x=sqrt(3). c)use integration to find the ...

*March 5, 2016*

**Maxima, Stationary Points**

Thanks Reiny, Ive had a look on wolfram alpha and seen the solutions. My problem is I need to show it using Maxima but for some reason Maxima will not solve my equation 9x^6 + 28x^4 + 51x^2 - 88x - 10 = 0. So frustrating.

*March 5, 2016*

**Math Algebra**

Learning Center would like a possible net profit of $650,000 on its new resource manual it sells to schools. The fixed costs for producing the manual are $780,000 and the variable cost per package is $19.85. If the estimated unit sales are 1,250,000 units, what selling price ...

*February 26, 2016*

**algebra**

The formula will be A=P(1+r/n)^nt P stands for the initial amount invested, so P= 4000 R is the rate (.04), and N is the amount of times it is compounded per year (1). For example, saying "compounded quarterly" would make n=4. T is, of course, time (3). This makes ...

*February 25, 2016*

**Physics**

A spherical satellite has 12 identical monopropellant thrust chambers for attitude control with the following performance characteristics: thrust (each unit): 5 lbf; Is (steady state or more than 2 sec): 240 sec; Is (pulsing duration 20 msec): 150 sec; Is (pulsing duration 100...

*February 19, 2016*

**Math question/help please!**

Jacklynn draws two adjacent angles that form a right triangle. One angle measures 32°. What is the measure of the other angle?

*February 16, 2016*

**Physics**

(Someone please help me !! I don't understand this.) Two tiny conducting spheres are identical and carry charges of -27.3C and +61.0C. They are separated by a distance of 2.64 cm. (a) What is the magnitude of the force that each sphere experiences? (b) The spheres are ...

*February 9, 2016*

**math**

Chelsea has 10 yards of yarn. How many bows can be made if each bow uses 2/3 yard of yarn? Draw a diagram that represents the situation. How many 2/3 yard did he cut? Does he have any left over? How much? Write a division sentence to show the situation.

*February 3, 2016*

**chem**

The temperature of a 80.0 g sample of mate- rial increases from 15.0◦C to 42.0◦C when it absorbs 4.00 kJ of energy as heat. What is the specific heat of this material? Answer in units of J/g · K.

*February 1, 2016*

**science**

False

*January 20, 2016*

**History,Business Studies,Maths Lit,Cat,English,Afrikaans**

What can I study after Grade 12

*December 30, 2015*

**English**

I have to do a 10-minute speech based on this: Give an account of Britain’s colonial policies concerning Africa, Australia, India, and New Zealand in the 19th century. I have little to no prior knowledge of this, so I'm not really sure where to start, or what I can ...

*December 10, 2015*

**Algebra**

If x varies directly as y and x=9 when y=2 find x when y is 6

*November 24, 2015*

**geography**

Where did the Cold War take place?Please just be specific(answer in countries).

*November 16, 2015*

**math**

Least to greatest quart gallon liter pint cup deciliter

*November 9, 2015*

**Programming**

Create and test a Visual Basic application to allow teachers to enter student results. One dimension of the array will hold the results for up to 10 students. The other dimension will hold up to 5 subjects. Additionally a string based array will hold the names of the subjects...

*October 28, 2015*

**ELA Reading**

Lun is right

*October 7, 2015*

**Norman**

Algebra 2 The difference of two numbers is 4. Three times the smaller minus the larger is 10. Find the numbers.

*September 30, 2015*

**science**

What is the rarest element?

*September 29, 2015*

**math**

What is the hardest expression in the world?

*September 28, 2015*

**math**

What is 57 divided by 2.95

*September 28, 2015*

**Math**

A scuba diver dives to a depth to a of 50 feet, then rises 15 feet, sinks 12 feet, then rises 20 feet, whats the answer?

*September 14, 2015*

**Math**

Suppose that a wind is blowing in the direction S45°E at a speed of 50 km/h. A pilot is steering a plane in the direction N60°E at an airspeed (speed in still air) of 150 km/h. The true course, or track, of the plane is the direction of the resultant of the velocity ...

*September 14, 2015*

**Algebra 1**

Find the range of f(x)=-x+4 for the domain {-3,-2,-1,1} A) {7, 6, 5, 3} B) {7, 6, 5, 4} C) {-7,-6,-5,3} D) {-7,-6,-5,4}

*June 30, 2015*

**Science**

I promise is correct except #2 is C

*May 11, 2015*

**governmnt**

Congress convenues every two years on_____of every____ year.

*May 8, 2015*

**Chemistry**

1.1026 ATM 3ATM •50ml/150ml•310k/281.15k=1.1026

*May 7, 2015*

**math**

Box B by $0.04 or 12in.^2

*April 23, 2015*

**Pre-calc**

There exist constants a, b, c, and d such that(sin x)^7 = asin 7x + bsin 5x + csin 3x + dsin x for all angles x. Find d. I tried rewriting them in the exponential form, but it becomes ugly as there are many negative cosines and divisions of i. Help?

*April 7, 2015*

**Physics**

A skateboarder approaches the circular hill with a velocity of 8.0 m/s at point B. The angle formed between the lines that join point AO and BO is 20 degrees. a) what is her speed at the top of the hill(Point A) if she coasts up to this point? b) what min speed must she have ...

*April 7, 2015*

**chemistry**

why doesnt the radius ratio rule work for TlCl3??? the division would be the radius of the cation / radius of the anion. For Tl3+ and Cl-...88pm/181pm = .49 which would correspond to a 'zinc blende' crystal structure and not a CsCl type crystal as the rest of the ...

*March 7, 2015*

**science**

I would say it is 0 because work is the a function of Force and horizontal displacement.

*March 7, 2015*

**Art 7**

Number 3 is D and Number 7 is D

*March 6, 2015*

**math**

A cyclist covers his outward journey downhill at 24mph. His return journey, over exactly the same distance uphill, is covered at only 12mph. What is the cyclist's average speed over the entire journey?

*March 5, 2015*

**Chemistry Help**

How many moles of H2 and N2 can be formed by the decomposition of 0.250 mol of ammonia, NH3? Is it 0.250*3mol H2=0.75 0.25*1mol N2=0.25 Am I correct?

*February 28, 2015*

**Chemistry Help**

oh i got it... thank you so much

*February 27, 2015*

**Chemistry Help**

so i have to do 1/2*0.00759=0.003795 = 3.795 mL is the answer?

*February 27, 2015*

**Chemistry Help**

Ba(OH)2 is 1/2 How can you get 1/2 from.

*February 27, 2015*

**Chemistry Help**

I still have problem on how can you get mols Ba(OH)2 from. Can you explain please

*February 27, 2015*

**Chemistry Help**

How many milliliters of 0.534 M Ba(OH)2 solution are needed to completely neutralize 34.5 mL of 0.220 M HBr solution? The reaction is Ba(OH)2(aq) + 2HBr(aq) → BaBr2(aq) + 2H2O(l) I did 0.0345 * 0.220 = 0.00759 Moles of HCl =2*0.00759= 0.01518 0.01518*1000= 15.18 mL ...

*February 27, 2015*

**Chemistry Need Help**

Thanks both of your replied. I got it now :)

*February 27, 2015*

**Chemistry Need Help**

Sorry but I still don't understand your explaining. Can you explain more briefly please. Thanks.

*February 27, 2015*

**Chemistry Need Help**

Cl2 + F2 -> 2ClF

*February 27, 2015*

**Chemistry Need Help**

Given the chemical equation, Cl2 + F2 2ClF, how many moles of ClF are produced in the reaction, if 1.50 moles Cl2 are made to react with 1.75 moles F2 ? I got the answer 3.50 moles but it was wrong. Can anyone help me please.

*February 27, 2015*

**Math**

1 inch = 15 miles: Franklin to Washington is 45 Miles (3 inches) Franklin to Lincoln is 30 miles (2 inches) How much farther from Franklin is Washington than is Lincoln? I worked it out to be 7 1/2 miles but my teacher says I am wrong? She says the answer is either 11 - 17 - ...

*February 25, 2015*

**science**

two small spheres lie 1.5 meters apart and carry identical charges. How large is the charge on each if a sphere experiences a force of 2.0 N.

*February 24, 2015*

**Math**

47. For science class, Kyle needs to make a dilute solution of 12 ounces that is 30% vinegar. But he only has 20% vinegar 60^ vinegar. How many ounces of 20% vinegar should he use? A. 3 ounces B. 6 ounces C. 9 ounces D. 10 ounces

*February 18, 2015*

**Math**

In triangle ABC, the degree measure of angle A is 20 degree greater than the degree measure of angle B. Angle C is a right angle. What is the measure of angle B? Is it 70 degrees. 90-20=70

*January 28, 2015*

**Calculus**

Ohhhhhhhhh THANKS

*January 12, 2015*

**Calculus**

F(x) = 3/4x^4 –x^3 -3x^2 + 6x Determine the interval(s) where f(x) is increasing (if any) and the interval(s) where f(x) is decreasing (if any). How do I know where f(x) is increasing or decreasing?

*January 12, 2015*

**sociology**

What does "Social Space" mean when we talk about location

*January 3, 2015*

**Sociology101**

thx

*January 2, 2015*

**Sociology101**

I found out. She said APA

*January 2, 2015*

**Sociology101**

She did not tell us which writing style to use. I think MLA is the standard.

*January 2, 2015*

**Sociology101**

I have to write an essay for my Intro to Sociology class. Do I write it in MLA or APA style?

*January 2, 2015*

**Simple math**

oh, I feel you

*December 4, 2014*

**Simple math**

If Kristin buys gas at $2.69 per gallon, which includes all taxes, what percentage of the price is the state tax? What percentage is the federal tax The state tax is .8 and federal tax is .18. So would I multiply each by the total amount the gas cost?

*December 4, 2014*

**math**

Darion needs 20 pieces of string 3/8 inch in length .He cut a 4 7/8 inch piece of string into pieces that are 3/8 of a inch long each. How many more pieces of string does he need?

*November 16, 2014*

**Operations with Fractions**

Darion needs 20 pieces of string 3/8 inch in length. He cut a 4 7/8 inch piece of string into pieces that are 3/8 of an inch long each. How many more pieces of string of string does he need?

*November 15, 2014*

**Is this correct**

Anyone??

*November 11, 2014*

**Is this correct**

f(x)= 1/3x^5 + x^-2 + 3, then f'''(x) is.. I got f'''(x)= 20x^2-24x^-5

*November 11, 2014*

**math**

A florist had an equal number of red and yellow tulips. She sold 624 red tulips. Then she had 4 times as many yellow tulips as red tulips. How many tulips did she have at first. 624 X 5 ----- 3120

*October 27, 2014*

**Physics**

A 15 kg sled experiences an applied force of 5.5 N [north] and an opposing frictional force of 2.5 N [south]. If the sled starts from rest, what will be the velocity of the sled after 4.0 s?

*October 26, 2014*

**Chemistry**

What is the difference between Citric Acid C6H8O7 and H3C6H5O7? I am seeing both and don't know which is the right one. Is one a solution of citric acid? Thanks

*September 29, 2014*

**P.E**

Lun is right

*September 8, 2014*

**algebra**

18x+4y=-10 9x-7y=-23

*September 4, 2014*

**math**

Area of a rectangle = 221 m2; width = length = ? Should the answer be 13 or or 26

*September 2, 2014*

**Physics**

Two boys are pulling a box across a horizontal floor as shown in the figure below. vector F 1 = 50.0 N and vector F 2 = 100 N. (a) Find the resultant (or sum) force by the graphical method. (b) Find the resultant (or sum) force by the component method.

*August 25, 2014*

**Trig**

Use the given information to evaluate sin (a-b). Exact answers. No decimals. Sin a = -7/25, cot b = 8/15; neither a nor b are in quadrant III.

*May 7, 2014*

**Math**

How many roots does x to the 3rd power -2x to the 2nd power-13x-10=0 have

*April 21, 2014*