Wednesday

April 16, 2014

April 16, 2014

Total # Posts: 363

**math**

which figure must have both parallel and perpendicular sides. 1.parallelogram 2. rectangle 3. rhombus 4. right triangles

**Chemistry**

Write the balanced chemical equation for each of the following. (Use the lowest possible coefficients. Include states-of-matter at 1 atm and 25unknown_prefixC in your answer.) (b) the reaction of magnesium metal and hydrobromic acid

**Chemistry**

Write the balanced chemical equation for each of the following. (Use the lowest possible coefficients. Include states-of-matter at 1 atm and 25unknown_prefixC in your answer.) (a) the dissociation of solid magnesium hydroxide in water

**Chemistry**

Write a balanced chemical equation that represents the self-ionization of water. (Use the lowest possible coefficients. Include states-of-matter at 1 atm and 25°C in your answer.)

**Chemistry**

How many milliliters of 0.326 M HCl would be required to titrate 5.48 g KOH?

**Chemistry**

What are the molality and mole fraction of solute in a 32.3 percent by mass aqueous solution of methanol (CH3OH)? molality = ?m mole fraction =

**chemistry**

In the laboratory a student finds that it takes 20.7 Joules to increase the temperature of 11.0 grams of solid platinum from 20.5 to 35.8 degrees Celsius. What is the specific heat of platinum she has measured.

**Chemistry**

Possible Sources of error in a reaction or sodium bicarbonate and acetic acid. Also known as baking soda and vinegar.

**Chemistry**

When copper(II) oxide is heated in the presence of hydrogen gas, elemental copper and water are produced. What mass of copper can be obtained if 34.0 g copper(II) oxide is used?

**Chemistry**

In 1901, Thomas Edison invented the nickel-iron battery. The follwing reaction takes place in the battery. Fe(s) + 2 NiO(OH)(s) + 2 H2O(l) Fe(OH)2(s) + 2 Ni(OH)2(aq) How many mole of Fe(OH)2, is produced when 3.70 mol Fe and 6.95 mol NiO(OH) react?

**chemistry**

a 2.52-g sample of a compound containing only carbon, hydrogen, nitrogen, oxygen, and sulfur was burned in excess O to yield 4.23 g of CO2 and 1.01 g of H2O as the only carbon and hydrogen containing products respectively. Another sample of the same compound, of mass 4.14 g, ...

**math**

In the basketball game, Sarah made three times as many 2-point shots as 3-point shots. She made 8 shots in all. How many 2-point shots did she make?

**Math #rd grade**

Thank you! It was worded so weird I didn't know what they wanted. : )

**Math #rd grade**

Bryan has 3 nickels, 3 dimes, and 2 quarters. What fraction of the coins is either a dime or a quarter? There is a space for only 1 fraction answer.

**Spelling**

What is the antonym of brandishing? a) furbishing b) concealing c) defacing d) galvanizing

**us history**

How did immigrants regard public education? a. as an aid to assimilation b. as a threat to cultural heritage c. as a path to advancement d. all of the above

**English**

I have the sentence: Kyle seems calm despite his situation. Kyle is the subject, seems is the being verb, calm is a subject complement adjective that describes Kyle. My question is, is "...despite his situation" an adverb phrase? Is it describing calm or seems? Thanks,

**math**

In a class of 40 students, 27 like math and 25 like Filipino. At most how many students do not like at least one of these subjects?

**chemistry**

a tuning fork produces a sound of musical note middle C. It moves back and forth 256 time each second. What is the frequency of the tuning fork?

**grammar**

can you explain the predicate and complete predicate in a sentence

**Geography **

Why do the trees drop their leaves in the fall?

**Geometry**

The peremiter of triangly rst is 40 what is the perimeter of triange xyz

**calculus**

After solving with A=(-1,2) x^2+2x^2+x+1 got 119/12a pls where did i get it wrong. And with -[(-55)] x^2-25dx i got -50 pls am i correct

**calculus**

find the area enclosed between the x-axis and the curve, if y=x^2-25 for (-5) is less than or equal to x less than or equal to 5

**calculus**

find the area enclosed between the x-axis and the curve, if y=x^3 and the straight line y=x

**calculus**

find the area enclosed between the x-axis and the curve, if y=x^3+2x^2+x+1 between x=-1 and x=2

**calculus**

Determine l= 2e^xdx, given that l=50.2, when x=3

**calculus**

int e^5xsin3xdx =

**calculus**

int dx/3sinx+4cosx dx =

**calculus**

int x^2/(x-2)(x^2+1)dx

**physics **

A car is traveling at 95km/hr. the driver steps on the brakes and the car comes to a stop in 60m. What is the car's deceleration?

**geometry**

Given that r1=6i-8j+2k,r2=4i+5j+7k,r3=-2i+j+6k is a vector. Find r1r2,r2r3,r3r1(a)30,21,-8(b)26,23,8(c)24,19,-7(d)19,27,7

**geometry**

if U=i+3j-2k and V=4i-2j-4k are vectors find U.V, 3U+V& (2U+V).(U-2V) (a)6,10,4(b)4143(c)11,4,5(d)5,11,6

**physics**

Two charges Q 1 =500/mu(C) and Q 2 =100/mu(C) are located on the XY plane at the positions r1=3/vec(j)m and r2=4/vec(i)m. Find the force exerted on the Q2(a)14.4/vec(i)+10.8/vec(j)(b)14.4/vec(i)-10.8/vec(j)N(c)10.8/vec(i)-14.4/vec(j)N(d)10.8/vec(i)+14.4/vec(j)N

**physics**

Two large horizontal metal plates are separated by 4mm. The lower plate is at a potential of (-)6v.What potential should be applied to the upper plate to create field strength of 4000v/m upwards in the space between the plates?(a)(+)22(b)(+)10(c)(-)10(d)(-)22

**Math**

nn jhb

**Math**

tom had 18 comic books , while Diane and Helen had none. Tom gave 1/3 of the comic books to Diane who passed 1/3 of these books along to Helen. If Tom then gave Helen 1/3 of the books he had left, how many comic books did Helen receive from Tom and Diane

**Math**

An airplane traveled a distance d in t hours, where r>1, and arrived one hour late. The airplane would have arrived on time if it had traveled at what rate per hour? a. t-1 b. d/t-1 c. d/t+1 d. d/t-1 e. d/t+1

**Math**

Each plant of a certain variety yields 50 seeds in the early fall and then dies. Only 40 percent of these seeds produce plants the following summer and the remainder never produce plants. At this rate, a single plant yielding seeds in 1986 will produce how many plants as desce...

**Language barriers**

Females are passive

**Ganguage barriers**

If a child displays discriminatory behavior in the classroom, one should

**Language and other barriers**

An example of an exceptional child is one who

**Technology**

Non system disc means

**Technology**

If you want to teach whole classes how to use computers, where is the best place to locate the computers?

**math**

At a point on the ground 80ft from the base of a tree,the distance to the top of the tree is 11ft more than 2 times the height of the tree. find the height.

**Physics**

What happens to the momentum of the truck if sand leaks at a constant rate through a hole in the truck bed while the truck maintains a constant velocity?

**life orientation**

6 ways in which earthquake can impact negatively on one's health

**math**

0.21 x 63 = 13.23

**Math**

A lighthouse is east of a Coast Guard patrol boat. The Coast Guard station is 20 km north of the lighthouse. The radar officer aboard the boat measures the angle between the lighthouse and the station to be 23°. How far is the boat from the station?

**Chemistry**

When I solve for H^+ I put 1.7 x10^-3 x 0.26. I got 4.42 x 10^-4. My pH is 3.35. Is that right?

**Chemistry**

Substance X (MW=356gm) is a weak acid. Its Ka is 1.7x10^-3. Calculate pH of725ml of the following solutions: a)Containing 0.187 mol of substance x b)containing 127gm of Substance x I have been trying to figure this problem out for hours now and do not get it. Please help me an...

**Chemistry**

Does that mean that I do not need to do an ICE table but just use the HH equation?

**Chemistry**

Calculate the pH of the following buffer solution that resulted from 125ml of 0.1M NH3 with 250ml 0.1 M NH4Cl ( for NH3, Kb= 1.76x10^-5)

**Chemistry**

Calculate the pH of the following buffer solution that resulted from 125ml of 0.1M NH3 with 250ml 0.1 M NH4Cl ( for NH3, Kb= 1.76x10^-5)

**Chemistry**

Three metals P,Q and R form three ionic solids with three nonmetals X,Y, ands Z respectively as follows P2X, QY2, and RZ3. If their molar solubilities are the same, how are their Ksp values related? Please not only explain but write the respective dissociation.

**algebra 2 (permutations & combinations)**

from a standard deck of 52 cards, how many different five-card hands can be drawn?

**science**

tundra

**Math**

What property is this? 4(7+9)=(4x7)+(4x9)

**Math**

One half of 9.76

**Math**

The sunglasses that Ramon wants to buy are 50% off the original price of 85$ .How much did he have to pay?

**Math**

What is a attribute?

**Chemistry**

When 50.0ml of 1.00M HCl is titrated with 1.00M NaOH, the pH increases. calculate the difference in pH of the system when you add 49.99ml NaOH and 50.01ml of NaOH. Please work out detailed steps.

**Chemistry**

You have two buffer solutions 1) weak acid and its conjugate base 2)weak base and its conjugate acid. Write explicitly ( considering generic formula for acid and base) the equations of neutralization when you: a) add strong acid and strong base 1) b) add strong acid or strong ...

**Math**

6 quarters, 4 dimes, 3 nickels, 10 pennies. what is the probability you will get at least one of each coin in change of 1 dollar

**chemistry**

what is the total heat lost if you have 8 grams of copper and the temperature changed from 43°C to 36°C

**Statistics**

A national caterer determined that 87% of the people who sampled their food said that it was delicious. A random sample of 144 people is obtained from a population of 5000. The 144 people are asked to sample the caterer's food. If sample proportion, P^, is the sample propo...

**NJHS (essay)**

hi, i'm currently applying for the national junior honor society, and i'm working on my essay. any ideas what i should include??? ps. i have no leadership experience and the section is blank! D:

**Statistics**

Suppose a basketball player is an excellent free throw shooter and makes 90% of his free throws (i.e., he has a 90% chance of making a single free throw). Assume that free throw shots are independent of one another. Suppose this player gets to shoot three free throws. Find the...

**Basic Math Venn Diagram**

Hi! Having a lot of trouble with this one problem. The venn diagram problem is n(U)-n(B). I realize I did not post the venn diagram, I just need to know how to solve that type of problem using a venn diagram! Help would be greatly appreciated. : ) Thank you so much!! God Bles...

**Math**

Thx that really helped😄😃😜😝👍👍❕👏🎓🆗🆕🔝🆒 freind bump🆙

**Math**

I don't know what 4r=96 means. Also I don't know what 51=3n means!😰😁😱😨📝HELP! It's due tomorrow

**Physics**

A uniform ladder of 5.0 m long and 12 kg is leaning against the wall (contact with the wall = point b, contact with the floor = point a). The height from the ground to point b is 4m . The wall is frictionless but the floor is not. A painter of 55 kg climbs 75% of the way up th...

**MATH**

if 5 times a certain integer ìs subtracted from twice the square of the integer the result is 63. find the integer

**Algebra 1**

In 1991, the federal minimum wage rate was $4.25 per hour. In 1997, it was increased to $5.15. Find the annual rate of change in the federal minimum wage rate from 1991 to 1997.

**Macroeconomics**

If the economy is at point C what is the cost of one more automobile? One more forklift?

**3rd grade math**

30/100 = 3/10

**3rd grade math**

30/100 = 3/10

**chemistry**

a sample of sulphuric acid is 95.7% by mass and has a density of 1.84g/cubic cm.calculate the mass of pure H2SO4 in a 2.00L bottle and volume of acid that contain 200g of pure H2SO4.

**Environmental Biology**

Identify two different types of businesses or corporations (be as specific as possible) that receive subsidies, through which it could be argued that environmental damage is a result. Briefly describe the environmental damage for each.

**solid mensuration**

what is the area of a section bounded by a closed elliptical figure in which the major and minor segments measure 60 cm and 45 cm

**Physics...Help!!!**

given that Earth's surface gravitaitional field strength has a magnitude of 9.80N/kg, determine the distance(as a multiple of Earth's radius re) above the Earth's surface at which the magnitude of the field strength is 3.20N/kg.

**Economics**

If businesses believe consumption will increase six months from now, everything else held constant, and they begin to increase investment, what do you predict will happen to aggregate demand?

**Chemistry**

Devise a test to distinguish between Cu2+ and Co2+.

**Chemistry**

Devise a test to distinguish between Cu2+ and Co2+.

**Chemistry II**

Devise a test to distinguish between Cu2+ and Co2+.

**science**

what do oxygen and sugars do in photosynthesis

**Algebra**

Task Type: Individual Project Deliverable Length: 3 Parts: See Assignment Details Points Possible: 150 Due Date: 11/5/2012 11:59:59 PM CT Weekly tasks or assignments (Individual or Group Projects) will be due by Monday and late submissions will be assigned a late penalty in a...

**math**

Can someone please help me? I don't know how to work this out, and my friends don't either. Eight hot dogs and ten buns come in separate packages. a. Is the number of hot dog packages proportional to the number of hot dogs? Explain. b. Is the number of hot dogs per pac...

**calculus **

Write a formula for f^-1 (x) if f(x) = (x+5)/(3x-4) and state the domain of F^-1

**art need help**

Yeah! Connections Academy Questions!!! I need em all!!! Halp!!! The text book is poop on my Mac.

**physics**

The maximum speed of a child on a swing is 4.90 m/s. The child's height above the ground is 0.525 m at the lowest point in his motion. How high above the ground is he at his highest point?

**Math**

I really need help

**BIS 245 lab**

need help

**physics**

A passenger on a moving train tosses a coin with an initial velocity of (-2.25 m/s)x unit vector + 4.26 m/s)y unit vector (from the point of view of the passenger). The train's velocity relative to the ground is (11.5 m/s)x unit vector. (a) What is the minimum speed of the...

**Math**

There are 36 students in Mrs. Keaton's sixth grade class. If 5/12 of her students are girls, how many girls are in the class? Thanks :-)

**math**

al has twice as many baseball cards as frank and four times as many football cards as joe. the expression 2x+4y can be used to show the total number of baseball and football cards Al has. If the answer is y, then what is the question?

**Math**

a jar contains green,red,and blue marbles.The probability of choosing a blue marble is 1/3, the probability of choosing a red marble is 1/2,the probability of choosing a green marble is 1/6.If there are 12 marbles in the jar,and then three green marbles are added,what is the n...

**Math**

If x-2y-z=2,x-y+2z=9 and 2x+y+z=3,then z=?

**Math**

the cube has a volume of 8.If point x,the midpoint of AV is joined to point y, the midpoint of edge CD what is the length of the shortest distance from x to y?

**Math**

John will have to make 180 monthly mortgage payments and the first payment was made on January 15,1989.If he makes one payment each month,in what year will John make his last payment?