Thursday
July 31, 2014

Posts by Lili


Total # Posts: 67

geometry
1) A billboard on level ground is supported by a brace, as shown in the accompanying diagram. The measure of angle A is 15 degrees is greater than twice the measure of Angle B. Determine the measure of Angle A and the measure of angle B.

math
how can you use models to show and name a number 1,400 in two different ways? explain

Physics
A surveyor measures the distance across a straight river by the following methods: Starting directly across from a tree on the opposite bank, she walks 249 m along the river bank to establish a baseline. Then she sights across to the tree. The angle from her baseline to the tr...

physics
A SUPPOSED TREASURE OF OLD SILVER JEWELRY IS UNCONVERED. a.02M^3 BOX OF THE "OLD JEWELRY" HAS A MASS OF 177KG.IS IT R EALLY OLD SILVER? IF NOT WHAT IS IT?

Physics
why is the heat lost by the metal sample (Ql)equal to he heat gained by the water in the calorimeter (QG)?

statistics
i have first part. If u have a second, wy can exchange.

math please help!!
2x^2-4X-3=6

math
find an equation in slope-intercept form of the line that has slope 2 and passes through point A(-8,7)

math
find all real zeros of the function y=-7x+4. a.-4/7 b.-7,4 c. -7 d.4/7 how do you find it?

physics
An astronaut throws a wrench in interstellar space. How much force is required to keep the wrench moving continuously with constant velocity? Select one of the options below as your answer: A. a force equal to its weight on Earth B. a force equal to zero C. a force equal to ha...

physics
An object has a force of 10 newtons from the right and 17 newtons from the left. Once the object starts moving toward the right, an additional force of 7 newtons is applied from the right. What can you conclude about the direction of motion of the object after the application ...

physics
An object has a force of 10 newtons from the right and 17 newtons from the left. Once the object starts moving toward the right, an additional force of 7 newtons is applied from the right. What can you conclude about the direction of motion of the object after the application ...

physics
An object has a force of 10 newtons from the right and 17 newtons from the left. Once the object starts moving toward the right, an additional force of 7 newtons is applied from the right. What can you conclude about the direction of motion of the object after the application ...

organic chemistry
when 2 propanol was used as the developing solvent, two substances moved with the solvent front (Rf=1) during TLC analysis on a silica gel plate. can you conclude that they are identical? if not what additional experiments would you perform?

math
nearest tenth of a percent of 1/260

physics
A metallic surface emits photo electrons when green light falls on it. But the metal does not emit when yellow light falls on it. Which of the following is correct when red light falls on the metallic surface?

math
I am a 3 digit odd umber. my tens digit is one less than my hundreds digit but two more than my ones digit. The sum of my digits is 20. who am I?

Differenctial equations
Use the change of variable x = exp(s) to recast the differential equation xy′′+y′+(L/x)y=0 Please HELP ME

chemistry
Find the theoretical yield when 100 mL of 0.1 M NaI is reacted with 0.50 mL of Br2 (density: 3.10 g/mL) to produce NaBr and I2. What is the actual yield if the percent yield is 81%? (Atomic masses (g/mol): Na, 22.99; I, 126.9; Br, 79.90)

algebra
6(5)-3(5)^2+3^3=-18

chemistry
(AAAAA)The standard reduction potentials of lithium metal and chlorine gas are as follows: (for Li, reduction potential is -3.04, for Cl it is 1.36) In a galvanic cell, the two half-reactions combine to 2Li{+](s) + Cl{-}2(g) --> 2Li{+}Cl{-}(aq) Calculate the cell potential ...

chemistry
Great! The CN was the spectator that did "nothing." thank you very much.

chemistry
the answer is 4AG + 8CN{-} + O2 + 2H2O=> 4AG(CN)2{-} + 4OH{-} I do not understand the plugging in of CN. COuld You please explain?

chemistry
I think I understand...but how do I do CN- reactant? do I do a half reaction too?-->with a product of CN2???

chemistry
Balance the following redox equation occurring in a basic solution: AG + CN{-} + O2 = AG(CN)2{-} I tried...but this is wrong...2H2O+ AG + CN{-} + O2 = AG(CN)2{-}+4OH{-}... I am supposed to do half reactions...how do I spit the product AG(CN)2{-}?????

chemistry
oh never mind--I got it!!! (I did half reactions...)

chemistry
The reaction of MnO4- with oxalic acid (H2C2O4) in aciic solutiob, yielding Mn2+ and CO2 gas, is widely used to determine the concentration of permanganate solutions. (a) write a balanced equation for the reaction would it be MnO4- + H2C2O4 --> Mn2C2O4 + H2O + O3-?????

statistics
5x4x3

BK
If the incline is 25 degrees and a box that is resting on the frictionless incline 50 kg, what is the box acceleration

chemistry
mol HA + NaOH --> NaA + H2O i x 0.030 f x-0.030 0 0.030 pH = pKa + log(0.030/x-0.030) x = 0.042 mol PM=5.5g/0.042mol = 129.1 g/mol

science
a girl delivering newspaper travels 3 blocks west, four blocks north, then 6 blocks east. What is the total distance she travel

4th grade
sol. ass 5% + ? apa distilata = sol. hipochloride 4%

physics
39.16

Physics
1.6

sequence and series
express the given repeating decimal 0.159159159 as a fraction

Pre Algebra
can you teach me how to do math? please

matc
If a manufacturer charges q dollars each for footballs, then he can sell 3000-150q footballs per week. Find a polynomial R(q) that represents the revenue for one week. Find the weekly revenue if the price is $8 for each football.

math
MY DAUGTHER WILL BE 10 YEARS NEXT WEEK AND THE HOMEWORK SAID: A NORMAL PERSON BLINKS ABOUT 25 TIMES PER MINUTE WHEN AWAKE. A) HOW OLD WILL YOU BE ON YOUR NEXT BIRTHDAY; B) TO THE NEAREST MILLION, HOW MANY TIMES WILL YOU HAVE BLINKED ON YOUR NEXT BIRTHDAY?. ASSUME YOU SLEEP 8 H...

math
Roberto ate 3 pieces of a pizza and them felt that he should pay 1/4 of the cost because that's the fraction he ate. How many pieces was the pizza cut into? Please could you explain me the problem and you give me the answer? thank you

geometry
given: angle 1 is congruent to angle 2, angle measure 1=120 prove: angle measure 3=120

physics
For constructive interference d sinQ=ml=2x460nm=920nm For destructive interference of the other light, we have d sinQ=(m’+1/2)l When the two angle are equal, then 920nm=(m’+1/2)l l=1.84x103 nm for m’=0 l=613 nm for m’=1 l=368 nm for m’=2 The only wavel...

Math(place value numberation)
what 1min 38.29

Maths-Algebra.
z=6.75?

algebra 2
oh yeah duh haha it doesn't matter what was before there're two choices haha i remember now :] hey answer my question!!

algebra 2
i think ... isn't it 3/4?

Algebra
that's what i got too

History
it looks like my teacher printed out highlights from our lesson and whited out parts, it's a "fill in the blank" packet but i don't have the book and it's due tomorrow! What do i do?

math6
between 2 1/2 and 3 is 2 3/4 between 3 1/2 and 4 is 3 3/4

7th grade science
i'm an eighth grader and idk what you guys are talking about :]

ochem
Can you suggest some possible reasons for using a mixture of water and ethanol (1:1 mixture H2O/EtOH) as crystallizing solvent rather than using either pure ethanol or pure water?

organic chemistry lab
What would be the effect of raising the temperature and increasing the carrier gas flow rate on the ability to resolve two closely spaced peaks?

Science
If the energy carried by a sound wave is multiplied by a thousand, by what factor does the intensity of the sound wave increase?

history
when was willian (Bill) H. Gates born?

chemistry
What preliminary test are you looking for to identify conclusively your unknown solutions as Set C? Explain

chemistry
what simple test would you use to identify the possible presence of HCl(aq)? What result do you expect if the solution is HCl(aq)?

chemistry
write a balanced equation for the reaction that occurs when an aqueous solution of iron(II) chloride is mixed with an aqueous solution o potassium hydroxide.

chemistry
Hydrogen gas (a potential future fuel) can be formed by the reaction of methane with water according to the following equation: CH4(g)+H2O(g) = CO(g) + 3H2(g) In a particular reaction, 26.5 L of methane gas (measured at a pressure of 736 torr and a temperature of 25 C ) is mix...

chemistry
A weather balloon is inflated to a volume of 27.0 at a pressure of 730 and a temperature of 31.3. The balloon rises in the atmosphere to an altitude, where the pressure is 365 and the temperature is -14.6. Assuming the balloon can freely expand, calculate the volume of the bal...

chemistry
A weather balloon is inflated to a volume of 27.0 at a pressure of 730 and a temperature of 31.3. The balloon rises in the atmosphere to an altitude, where the pressure is 365 and the temperature is -14.6. use as a ideal gas behavior

chemistry
use as a ideal gas behavior

chemistry
A 3.00- flask is filled with gaseous ammonia, . The gas pressure measured at 28.0 is 1.55 . Assuming ideal gas behavior, how many grams of ammonia are in the flask?

italiano
come cambiare la scuola

geometry
the surface area of a sphere if the radius, r, is 6 meters.

WRITING
What differences did you notice between your logical reasoning process and your moral reasoning process?

pigskin
week 11 and 12 its hard

GEOMETRY
the surface area of a sphere if the radius, r, is 6 meters.

science - controlled experiment
what's the answer

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