# Posts by matthew

Total # Posts: 730

**Chem**

At room temperature and pressure RbI crystallizes with the NaCl-type structure. (a) Use ionic radii to predict the length of the cubic unit cell edge. (b) Use this value to estimate the density. (c) At high pressure the structure transforms to one with a CsCl-type structure. (...

**probability**

For part 5 (though this only affects 5b), ensure that you have normalized the conditional PDF.

**Maths**

Two concentric circles are such that one circle has half the radius of the other. If a point is chosen at random inside the larger circle, the probability that it also lands outside the smaller circle is?

**Science**

Witch of the following shows the path followed by nerve impulses in a reflex

**Math**

The smaller angle between the hands of a clock at 8:43 is what?

**Math**

A sum of $7260 is invested at 11 1/4 % simple interest for one year. The amount, in dollars, that must be invested at 7 1/2% simple interest for one year to earn the same amount of interest?

**Chemistry**

Potassium superoxide, KO2, is used for producing oxygen and removing carbon dioxide in selfcontained breathing units, space shuttles, and other enclosed spaces. First the potassium superoxide reacts with moisture to release oxygen and produce potassium hydroxide. Then the ...

**Chemistry**

Suppose you have a mixture that contains CaCl2, plus other compounds that do not react with AgNO3. If 0.2918 g of the mixture yields 0.4462 g of AgCl, what is the percentage of CaCl2 in the mixture (thats what was missing from the prior q). Also what did you mean when you said...

**Chem**

So... its correct?

**Chem**

An organic compound containing only C, H, and possibly O was subjected to combustion analysis. A sample weighing 0.4801 g yielded 1.014 g CO2 and 0.498 g H2O. What is the empirical formula of the compound? I got C5H12O2. Please let me know if this is correct.

**Chem**

Suppose you have a mixture that contains CaCl2, plus other compounds that do not react with AgNO3. If 0.2918 g of the mixture yields 0.4462 g of AgCl, what is the percentage of CaCl2 in the mixture. Thats whats missing.

**Chem**

CaCl2 reacts with AgNO3 in aqueous solutions to produce a precipitate of AgCl that can be filtered and weighed. The balanced equation for the reaction is: CaCl2 (aq) + 2 AgNO3 (aq) ? 2 AgCl (s) + Ca(NO3)2 (aq) I got 59.22%.

**Biology**

A stock protein sample that has a concentration of 250.0mg/ml. You need to dilute this sample to 20.0 mg/ml in buffer. The final volume of the diluted solution is 5.0ml. how much of the stock protein solution and buffer are required to achieve this? Answer with appropriate sig...

**Chemistry**

A mixture of KCr(SO4)2 and its hydrate KCr(SO4)2•12H2O has a mass of 1.6336 g. After heating to drive off all the water, the mass is only 1.4659 g. What is the weight percentage of KCr(SO4)2•12H2O in the original mixture? Report your answer to 4 significant figures. ...

**Math**

Nine wonderful students decided to buy their math teacher an expensive present, each contributing the same amount of money. Four other students found out about the plan and joined in, agreeing to pay their share of the present's cost. This resulted in a saving of $33.32 ...

**How many beats are in a measure of 3/8 time?**

A)2 B)3*** My ansnwer C)4 D)8

**Music **

How does the duration of a quarter note compare to a dotted quarter note? A) longer B) shorter**** my answer C) the same

**math**

to which subset of real numbers does the number -22 belong?

**algebra**

simplify log (xy/z^2) log^5square root a^4/b^2

**algebra**

thank you Steve for helping me out. Accurately classify the sequence and then create a corresponding explicit and recursive formula for finding the nth terms of each sequence. A. 32, 30, 28, 26,..... B. 9,-3, 1, - _1 .......

**algebra**

find a quadratic model and term number the last given for 10,12,16,22,30,40,....516

**algebra**

the second and fifth terms of an arithmetic sequence are 5 and 38 respectively. Find the explicit formula for the sequence

**algebra**

If Ron put $1000 of his money into a bank account that earns a 2.3% annual interest rate, how much will he earn after 10 years if the interest is compounded A. yearly, B monthly? C. continuously?

**Math**

The number of 3 digit odd numbers with no repeated digits is?

**English**

In "Girls Can We Educate We Dads?," the writer uses dialect for all of the following reasons except to A) create a sense of rhythm B) emphasize the speaker's voice C) emphasize the speaker's viewpoint D) illustrate the theme of defiance

**College Chemistry**

A 86.3mL sample of water is initially at 17.4 degC. How many kilojoules (kJ) of heat must be added to raise the temperature of the water to 31.8? The specific heat capacity of water is 4.184 J/g.degC. How do I set this up to find the answer. Really confused,we haven't been...

**Chemistry**

How many moles of nitrate ions are present in 24.0mL of a 2.93M solution of potassium nitrate? I'm thinking this is some form of unit conversion problem I know that M= molarity which is mol/L how ever I am confused on how to set this up and input information or if I'm ...

**english**

Yes! Thank you i took your advice from last time and it worked!! Thanks you're awesome!

**english**

Which of the following contains a comma splice? Geraldine is a volleyball star, she generated most of the points for her team. ** Obviously, the pull of gravity effectively keeps us from flying off into space. The letter on the coffee table, a note from the president, arrived ...

**english**

okay thank you.

**english**

would it be "Molimo has all the ingredients: dough, tomatoe sauce, pepperoni, and shredded cheese." and "Ivan arrived late to the theater consequently, he could not enter until intermission. "?

**english**

Which sentence is correctly punctuated? Ivan arrived late to the theater, consequently, he could not enter until intermission.** Ivan arrived late to the theater consequently, he could not enter until intermission. Ivan arrived late to the theater. consequently, he could not ...

**Probablity **

Having a hard time with this question: Help Please With Replacement: This is a multi-stage experiment. There are 7 colored cubes in a bag. The colors are purple, blue, red, orange, white, yellow, and green. This is a multi-stage experiment with dependent events. Determine the ...

**Math **

This 3 dimensional shape has 6 faces that are triangles as well as one base that is a polygon. What is this shape?

**Probablity**

I think it is with replacement. The question doesn't say

**Probablity **

Having a hard time with this question: Help Please This is a multi-stage experiment. There are 7 colored cubes in a bag. The colors are purple, blue, red, orange, white, yellow, and green. This is a multi-stage experiment with dependent events. Determine the probabilities of ...

**Probablity **

There is a bag with 200 cubes in it. Some of the cubes are red and some are black. You reach into the bag 20 times, each time picking up random cube, recording its color, and putting the cube back in the bag. You picked 7 black cubes and 13 red cubes. With this information, ...

**math**

Circle the prime numbers in the following set of numbers. Show your work. 953, 1,427, 2,971 I can tell whether each number is prime but I am having a hard time with individual numbers

**psychology**

Something along the lines of... The people that pick up litter come in all shapes, sexes and colors topic sentences need to establish the topic quickly and concisely

**psychology**

Couldn't it be as simple as placing a piece of trash on the floor in a mall and see how many people pick it up and throw it away in an hour. Fake results being 12 people out 25 picked it up, 6 of the 13 who didn't pick it up didn't even look at it

**Science**

momentum=mass(kg) multipled by speed(m/s)

**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 ...

**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.

**English**

#1 is D.

**pre calc**

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

**History**

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

**History**

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

**Math**

Check** Not 'chack'

**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...

**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 ...

**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?

**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...

**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

**Math**

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

**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, ...

**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 ...

**art**

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

**Math**

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

**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 ...

**Math**

How can you compare 0.7 and 5 over 8

**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.

**Health**

I thick c

**Math**

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

**Ecology**

an endemic species is best defined as a species that

**Math**

Please help me with that test!!

**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 ...

**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

**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?

**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?

**help azap math**

C. yards

**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.

**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...

**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?

**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 ...

**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.

**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 ...

**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 ...

**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...

**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?

**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 ...

**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.

**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.

**science**

False

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

What can I study after Grade 12

**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 ...

**Chemestry**

2FE+3O2=2FE+2O3 so=2FE2O3

**Algebra**

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

**geography**

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

**math**

Least to greatest quart gallon liter pint cup deciliter

**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...

**ELA Reading**

Lun is right

**Norman**

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

**science**

What is the rarest element?

**math**

What is the hardest expression in the world?

**math**

What is 57 divided by 2.95

**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?

**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 ...

**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}

**Science**

I promise is correct except #2 is C

**governmnt**

Congress convenues every two years on_____of every____ year.