Monday
July 28, 2014

Posts by Emily


Total # Posts: 2,300

Math Analysis
Can someone check my answers please? Thank you! If tan x = 3/5, evaluate: 1) tan 2x 2) tan 3x ==> For #1, I got 15/8; for #2, I got -99/5. Are these answers correct?

English
Wha are the nouns that describe a person called? They are like a noun that describe's a person's perosnality, such as perfectionist, troublemaker, bookworm etc.

English
Is there a verb for "question someone doubtfully or suspiciously"?

english
Using the four basic plot elements from the dramatic plot (exposition, complication, climax, resolution), how would I outline the progression of the main conflict in "The Miracle Worker"?

English
I need an adjective to describe someone who does not like to take the lead, or initiative. Thanks in advance!

English
thanks!

English
Thank you!

English
I need a character trait to describe someone who does not think or plan ahead. Thanks in advance!:)

Physics
Thank you!

Physics
Subject: Light and Geometric Optics Question: Where must a light source be placed in front of a concave mirror for a) light energy to be concentrated to a single point b)the light to be reflected in a parallel beam?

Honors Chemistry
Thanks so much!! This helped a lot!! :)

Honors Chemistry
"Would it be possible to have an addition polymer synthesized from a monomer that has only single bonds? Why or why not?" ==> I know that an addition polymer can only be synthesized from a monomer that has double bonds, but my textbook did not explain why. Can som...

geometry
The measures of the angles in quadrilaterals are in the extended ratio of 3:4:5:6. What are the measures of the angles?

math
how to solve y= 3cos2x + 5 pls help me

Chemistry
I know this is supposed to be a really easy concept, but I need help with balancing redox reactions: KClO3 ==> KCl + O2 My textbook says to write the ionic equation next, which I have written like: K(+1) + ClO3(-1) ==> K(+1) + Cl(-1) + O2(-2) (the number in parentheses i...

Chemistry
An air bubble has a volume of 0.500 L at 26 Celsius. If the pressure does not change, what is the volume, in liters, at -14 Celsius? If the pressure does not change, what is the volume, in liters, at 600 k?

Math Analysis
Use the half-angle formula to find the exact value of cos(x/2) when tanx = -5/8 and x is in quadrant IV. (| is a radical) ==> I got sqrt((89 + 8sqrt(89))/178). Is this correct? I hope my answer is easy to read..

math analysis
There's a hidden trigonometric identity.... 2sinxcosx ==> 4sinxcosx = 1 2(2sinxcosx) = 1 2sin2x = 1 Then you solve for x :)

Math Analysis
Oops, yeah those were supposed to be radicals :) thanks so much!!!!

Math Analysis
Find the exact value of cos(x/2) if sin x = 3/4 and x is in quadrant II. ==> I got ã(4-ã7)/2. Is this correct?

Physics
thanks!

Physics
Which is more harmful---smaller wavelength, like gamma ray, or larger wavelength, like radio waves?

Physics
thanks!

Physics
What is a mirror ( reflective surface and back) made out of?

Phsyics
Can you explain to me how an LCD works?

Physics
Thanks you!

Physics
What gases are in a fluorescent and incandescent bulb?

Physics
How when light rays travel outward from their light source in all directions, they are not parallel to each other, but when they approach an object they are parallel to each other?

Physics
DO diffuse reflections still follow the law of reflection? (Angle of incidence equals angle of reflection)?

us history
Do you think the changes in the 1920s gave Americans more control over their lives? Explain

Physics
How do you see your reflection in a plane mirror?

Calculus
Find the absolute max of f(x)=5x-e^(5x)

Physics
Does the law of reflection only apply to mirrors or any object?

Honors Chemistry
Ohhhh I see now! Thanks so much!! :)

Honors Chemistry
That's supposed to be q = mc(delta)T

Honors Chemistry
I have two questions on my review study guide that go like this: 1) What is the equation for calculating the energy change that occurs when a substance changes state? 2) What is the equation for calculating the energy change that occurs when a substance increases in temperatur...

Physics
A balloon appears to be yellow when seen in white light. Explain the colour it will appear in a) green light and b) magenta light. I really don't undestand the subtractive theory of light, and it applies to this question. Can you plese explain to me how to get the answer? ...

chemistry
when 5.0 g of CaCl2 is dissolved in 50 g of water, how do you get the boiling temperature of 101.5 degree c

Math
Idk . how to even do ?

Math
Idk . how to even do ?

Math
The Relatioship between x and y is y=5x + 18 How does the value of y change when x increses form 1 to 4? a. y increase by 15 b. y increase by 3 c. y decresases by 3 d y dercreased by 15 Help Prettty Pleassseee !

geometry
write an expression for the sum of the angle measures in a regular polygan with n sides. then wirte an expression for the measure of each angle in a regular polygan with n sides.

Chemistry
Why is it not a good idea to use an antacid routinely? (two reasons)

Chemistry
How come the charges of H*2O*2 (asterisk means subscript), which is hydrogen peroxide,don't equal? The charge of hydrogen is 2, and the charge of O is 4. For an ionic compound you can figure out the formula by the charges(when the charges of the ions add up to zero) but do...

S.S
Could you drive from Wisconsin to Michigan without crossing another state? If yes, how? If no, why not?

Social Studies
What is the name of the only colony on the South American continent?

Chemistry
If you have to write the products of the chemical reaction Fe+O*2( asterisk means subscript),how would you know the charge of Fe in the compound FeO? If the charge is 2+, then the product would be FeO, but if the charge was 3+, then the product would be Fe*2O*3. Thanks!

Chemistry
Suppose you place a kettle on the stove and boil some water.Is the steam that forms physical of chemical change?

math
what is the perimeter of a rectangle that measures 27 inches on one side and 56 inches on the other side?

business law
Please give me some insight on a law hypo...? This is the hypo: Joe received an advertising brochure from X Corp. in the mail. The brochure contained a photo of a Peach 442 computer, and above it the statement, "While supplies last. All Peach computers on sale at 25% belo...

Physics
i figured it out after all - thanks

Physics
The work function for potassium is 2.24eV. If potassium metal is illuminated with light of wavelength 310 nm, find the maximum kinetic energy of the photoelectrons. I have tried everything and still keep getting the wrong answer. The speed of light is 3 × 108 and Planck&...

fraction comparisons
Max did 19 situps. This is 1/7 as many as Isabel. How many situps did Isabel do?

chemistry
help me. i dont understand

chemistry
Excess florine, F2(g) reacts at 150 degrees celius with bromine, Br2(g) to give the compound BrF(n). If 423 mL of Br2 at 150 Degrees and 748mmHg produced $.20 g BrF(n), what is it? describe the bonding in the molecule, using valence bond theory.

grammer
Yesy the correct one is 3. The conjunction in that sentence is for. A conjunction links sentences together. There is always a comma before a conjunction.

geometry
y= 24

MATH
It is a well-known fact that homing pigeons fly faster over land than over water. Assume that they fly at 10 metres per second over land, and only 8 metres per second over water. A pigeon is located at the edge of a straight river bank, 500 metres wide, and must fly to its nes...

geometry
If a circle has a diameter of 2 3/8 inches, then what is the length of the radius?

algebra
Find the minimum and maximum values of the objective function subject to the given constraints? Objective Function: C=4x+5y Constraints: x>=0, y>=0, x+y<=6

math
you work at a grocery store. your hourly wage is greater after 6pm than it is during the day. one week you work 20 daytime hours and 12 evening hours and earn $280. another week you work 30 daytime hours and 12 evening hours and earn a total of %276. what is your daytime rate?...

math
during a recent telethon people pledged $25 or $50. twice as many people pledged $25 as $50. altogether, $18000 was pledged. how many people pledged $25?

Help me think of ideas for my essay?
My thesis statement for my synthesis essay to connect The Grapes of Wrath, The Great Gatsby and The Death of a Salesman is "It is impossible to maintain honor and also achieve success." Could anybody give me any ideas for my 3 body paragraphs I'm having trouble ...

Chemisty
calculate pH of 50.0 mL of a .100 M solution of the weak monoprotic acid HX

Chemistry
When you balance equations, do you treat polyatomic ions as one unit or treat the different elements in the ion separately? Because if you treat them as one unit, then what if the elements get separated in the products side of the equation?

Physics
i need help on this problem too

9th grade
soil dwelling insects are examples of invertabrates. explain why this statement is true and use examples of two soil dwelling insects

Civics
Are there any reliable websites that would give information and statistics on improvements that should be made to Immigration Canada?

science
I am doing a project on the Silurian time period and we need to know some organisms that were created during the time and some that went extinct. I found a bunch that were created but i didnt find any that went extinct!! Help!!

math
5 x (x + 2y) - (5x +2y) + y(2x + z) translate into a word phase.

physics
A 250. MW coal-fired power plant burns fuel with an energy density of 35.0 MJ kg-1. Water enters the temp reduction tower at 293 K and leaves at 350. K at a rate of 4200. kg s-1. 4. Calculate the energy removed by the water each second. 5. Calculate the energy produced by the ...

4gr math
6/87

4th grade math
write and solve a mixed number word problem

fractions
Claire cut some apples into eights. She ate all but 17 pieces. how many whole apples and parts of apples did she have left over?

fractions
Castor brought 6 3/4 cakes to share with 26 students. Did Castor bring enough for each student to have 1/4 of a cake? Explain your thinking and show your work

Math Analysis
From a ship off-shore, the angle of elevation of a hill is 1.1°. After the ship moves inland at 4.5 knots for 20 min, the angle of elevation is 1.4°. How high is the hill? (1 knot = 1 nautical mile = 6080 ft per hour) As I was just about to get the answer, I realized t...

4th grade
4/5682

science
I figured out the other three questions but im stuck on this one... If you digest an entire human genome with a restriction enzyme you get a blurry smear in the lane of the gel. Why?

science
What type of organism makes restriction enzymes? How did restriction enzymes evolve? How do scientists use restriction enzymes? If you digest an entire human genome with a restriction enzyme you get a blurry smear in the lane of the gel. Why? I have a quiz tomorrow on electrop...

6th grade
Cone u

6th grade
Cone u

english
"There" is defined as "at or in that place." ex. Sit over there. "They're" is a contraction of the two words "they are." ex. They're sitting on the bench. "Their" is the "possessive form of 'they'." ex...

Honors Chemistry
How does heating or boiling a substance affect its pH?

pre calc
You're correct about the numerator. You would simplify the denominator to be x(x-1). So now you have: x(x+2) ------- x(x-1) You can cancel out the x's on both the numerator and denominator, and so for your final answer you would have: (x+2) ------ (x-1) Does this make ...

Algebra 2
Both the numerator and denominator have the same bases for the exponents, right? So, dividing these two variables is the same as subtracting the exponents, like: n^(3-¨i)

Honors Chemistry
Ohhh I see. This makes more sense. Thank you! :)

Honors Chemistry
If 20 mL of 0.01 M aqueous HCl is required to neutralize 30 mL of an aqueous solution of NaOH, determine the molarity of the NaOH solution. ==> I got 0.01 M NaOH as my answer. Is this correct?

Honors Chemistry
I don't exactly understand this question -- can someone maybe explain it to me please? 6) Suppose you have an NaOH solution of unknown concentration. Name three possible substances that could be used in "known" solutions to titrate the NaOH solutions.

Math
In right triangle ABC, altitude CD is drawn to hypotenuse AB. If AD equals 4 and AC exceeds DB by 1, find DB. It is from a worksheet about proportions in a right triangle.

pre-Algebra
Sorry, struggling through pre-Algebra .. :-( .. How do i figure out 5x = -20 ?

Pre-Algebra ... again :-(
Thank you Miss Rose!

Pre-Algebra ... again :-(
How do i go about finding the integers of a product and quotient ... like, product of -20 whose quotient is -5 ..... thanks again

Math Pre-Algebra
Gotcha ... makes sense to me! :-) ... thank you! ... i may be back! :-)

Math Pre-Algebra
What is the value of 1 raised to a negative exponent? ... Maybe an example would help me better understand. Thank you very much ... I know it is like a fraction

Data management
The camera club has 5 members, and the math club has 8 members. There is only one member common to both clubs. In how many ways could a committee of 4 people be formed with at least 1 member from each group?

chemistry
is the correct answer 68.93kJ?

chemistry
Given that the specific heat capacities of ice and steam are 2.06 J/g°C and 2.03 J/g°C, the molar heats of fusion and vaporization for water are 6.02 kJ/mol and 40.6 kJ/mol, respectively, and the specific heat capacity of water is 4.18 J/g°C, calculate the total qu...

chemistry
What quantity of heat is required to vaporize 32.5 g of liquid water at 100°C?

Ecology
How does the skin and life cycle of a frog help indicate the health of local ecosystems?

cal 2
Find the number b such that the line y = b divides the region bounded by the curves y = x2 and y = 16 into two regions with equal area. (Round your answer to the nearest hundredth.)

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