# Posts by ALISON

Total # Posts: 347

**Chemistry**

you would use 1 Hz =299792458wavelength meters so using that you would convert kHz to Hz, then Hz to meters. for the radio wave in meters then you would continue using the same conversion as the one above and then convert meters to nanometers using 1m= 1X10^-9 nm. for the last...

**math**

thats correct.

**chemistry**

you would divide the grams of each molecule produced by the smallest ratio to find the subscripts.

**chemistry**

empirical formula is the smallest whole number ratio molecular formula is the empirical doubled i believe.

**Math**

you would do... combine the i"s and the whole numbers together. (8-4)+(-i+i)= 4

**PreCal**

Combine the whole numbers and the i's (7+-8) + (-7i+-2i) =-1+-9i

**mathematics**

Area of what kind of shape? it depends on the shape for the formulas for area. A=pie X r^2 for a square. V= LXWXH so to find your area you would need the radius.

**trig**

nevermind, figured it out.

**trig**

oh and its in degrees.

**trig**

find the exact values of the six trig functions of the angle. -750 sin(-750)= cos(-750)= tan(-750)= csc(-750)= sec(-750)= cot(-750)= I've tried this question over and over again and i cannot get it right. i believe -750 is in the fourth quadrant but I'm not sure. can ...

**Chem**

water is the base(H+ acceptor) and C2H4O2 is the acid(H+ donor) so Hydronium is the conjugate acid and C2H3O2 is the Conjugate base.

**algebra**

48-40x= -24x+48 add 40x from both sides.... 48= 16x +48 subtract 48 from both sides... 0= 16x 0=x

**trig**

find a value of interval in degrees cotalpha=1.3692847 alpha=0.023903 is that correct?

**trig**

degrees

**trig**

find the value of alpha cotalpha=1.3692847 is 0.023903 correct?

**trig**

find reference angle 111degrees and -105 does it equal =75? i don't know the first one

**trig**

suppose theta is in the interval (90,180 degrees) find the sign of csc(-theta) is it positive or negative = positive???

**trig**

use a calculator to find the decimal approx. (roud 8decimal places) : sec28°6' does it equal 1.13362379 or 87.99624264 ???

**Pre-Calc-Please check my answer**

I believe you are trying to factor the polynomial. so x^2 -4x+3 (x-1)(x-3) =0 x= 1,3

**trig**

the length of the base of an isosceles triangle is 30.42 inches. each base is 26.54 degrees. find the length of the two equal sides of the triangle to the nearest hundredths. i get 15.19. is that right?

**trig**

find all values of theta in the interval (0,360) that have the given value: sintheta= √2 ______ 2

**maths**

i think 4.631 or 4.6309 depending on sig figs.

**math**

For Calculating Percentages: You can for example change 4.89 to .00489 % by moving the decimal two places. or for science we usually divide the part of mass/ the whole and times it by 100 to get percentages. Calculating ratios: you can set up a proportion by.. x/30 = 1/3 and ...

**Trig**

find the exact values of the six trig functions of angle... sin(-315degrees) how do i do this?

**Trig**

assume A= alpha using complementary rule how do I solve for alpha? cos(2A+40) =sin(3A-60) I don't understand how to start the question. What are the steps in solving for alpha. Do i get cos to equal sin somehow?

**CHEMISTRY:))))**

A rock is 5.0% by mass fayolite(Fe2SiO4), 7.0% by mass forsterite(Mg2SiO4) and the remainder silicon dioxide. What is the mass percent of each element in the rock? I have the answers but i don't know how to solve the problem. How would you in steps solve the problem?

**chemistry**

Combustion rxn's produce carbon dioxide and water for their products.

**science**

WE BREATH AIR. WHICH IS COMPOSED OF OXYGEN,NITROGEN,ETC...

**algebra**

Post your answers and i can check them if you want.

**algebra**

For 2004: the deaths:.... y=-1777(4)+27153 Solve for y. For 2009: deaths.... y=-1777(9)+27153 solve for y. To find the number of deaths in years... 7606=-1777x +27153 and solve for x.

**Chemistry**

If you determine the volumes of these three ionic compounds, NaCl has the greatest volume. AlCl3--Has four ions MgCl2--has 3 NaCl-has 2 Salt can hold more Na+ to Cl- collisions. which form ionic compounds since there is a greater volume.

**7th grade science**

1) you might ask yourself, was my hypothesis correct, does my data seem reliable, was the experiment data reflect the law or theory proposed.

**Chemistry**

10loadsX6quartersX1hr.X60minX1shift _____________________________________ 1loadX4quartersX6dollarsX1hr.X75minutes equals the amount of shifts.

**Chemistry**

3.00X10^8 m X 1mileX 60secX60min ____________________________________ 1secX1610mX1minX1hr. equals mile/hr.

**Chemistry**

1foot = 0.305 what? units please. 164m^2 X 100cm^2 X 1in^2 X 1ft^2 _____________________________ 1m^2X 2.54cm^2X 12in^2 if you still need help post your work.

**Chemistry**

what are you units for speed of light?

**science**

you're welcome:)

**science**

a Conclusion is. is there choices?

**chemistry**

Use a conversion factor. You need the formula of sugar to solve for it. 9grams 1mol 6.022X10^23 formulaUnits X _____ X ___________ g of sugar 1mol ... __Formula units X atoms of oxygen ________________ 1formula unit then you get your answer in atoms of O.

**Chemistry**

A rock is 5.0% by mass fayolite(Fe2SiO4), 7.0% by mass forsterite(Mg2SiO4) and the remainder silicon dioxide. What is the mass percent of each element in the rock? I have the answers but i don't know how to solve the problem. How would you in steps solve the problem?

**math**

Use PEMDAS for operations. P-arentheis E-xponents M-ultiplication D-ivision A-ddition S-ubtraction So distribute the 6 first to 2z-9. And then combine like terms.

**Chemistry**

TO FIND THE % OF THE ATOM THAT THE NUCLEUS MAKES UP YOU NEED TO DIVIDE THE MASS OF THE PART YOU ARE TRYING TO FIGURE OUT BY THE WHOLE MASS OF THE NUCLEUS TIMES 100.

**geometry**

THE QR WITH THE LINE OVER IT REFERS TO A SEGMENT OF A LINE. JUST QR IS REFERRING TO A SIDE USUALLY OF A SHAPE.

**chemistry**

You have to use the combined gas law. (V1)(P1) / T1 = (V2)(P2) / T2 AND YOU PLUG YOUR GIVEN INTO THE EQUATION. (1910ML)(740TORR) / -22.8 = (V2)(740TORR) / 285DEGREES AND SOLVE FOR V2.

**english**

I think it's "they." Can the simple subject also be the complete subject?

**word processing**

For Letters--use single space For Reports----MLA Format-Double spaced

**algebra**

plug in your x and y values into the equation and solve. 2(15)+7(3) / 30.

**science**

atomic number = protons of element

**Math**

If you were to graph it, i would think that the more you spend time exercising the more you burn. SO a positive correlation.

**algebra**

You're missing something here. Because if you were to solve you would get 30/26.

**algebra**

You're saying that you are solving for z then. Are you trying to divide the 2xy+6/3y-4z?

**Chemistry**

The mass of the earth is known to be about 5.98 X10^24kg assume that it is approx. spherical with an average diameter of 1.276X10^7 METERS. from these data calculate the average density of the earth(g/cm^3) could the earth be made mostly of water (density=1.00g/cm^3), abundant...

**Math**

you need values to plug in for the variable "n". such as 1,2,....

**Chemistry**

number one contains 4 significant figures.

**Chemistry**

2,3,4

**Calculating Averages?**

i got 56.2amu but it was wrong. i don't know how to find the average amu?

**Calculating Averages?**

A certain element has four isotopes. 5.85% of has a mass of 53.93961 . 91.8% of has a mass of 55.934939 . 2.12% of has a mass of 56.93539 . 0.282% of has a mass of 57.93328 . What is the average atomic mass of element ? Express your answer numerically to three significant ...

**trig**

find the next two positive and negative angles coterminal with the quadrantal angle. 90 degrees. would the answer be..... would it be 450, 810?????? and -630, -270 ????

**Trig**

oh okay thanks! i wanted to put a negative.

**Trig**

cos270degrees -5cos180degrees (0/1)-5(-1/1) 0-5(-1) does it equal -5 or +5?

**Chemistry**

Density= Mass/vollume Density= 25.75g/25.00ml density =1.030g/ml

**Trig**

How do you write the answer in __degree___' it wants it written like that... would it be 22degrees30' or 22degrees25'

**physics**

A car starts from rest and accelerates for 6.1 s with an acceleration of 3.1 m/s2. How far does it travel? Answer in units of m.

**Chemistry**

2.0 %

**math**

what numbers would you use to estimate the sum of 47 and 21?

**math**

dans cette figure on compte 8 triangle.Ã‰cris le nom de chacun d'eux.

**Chemistry**

The boiling point of another member of this homologous series was found to be 309 K. What is the likely molecular formula for this compound? How many carbon atoms would you expect this new compound to have if its boiling point is between that of a four-carbon alkane and that ...

**pre calc**

Find the critical number of the function. g(t) = | 6t - 9 | t =

**science**

what is the food web!!!!!!!!!!!!!

**science**

what is the food web for the checkerspot butterfly

**geometry**

find the area of a trapezoid whose diagonals are each 30 and whose height is 18.

**maths pre ap**

Krispy Krunch cereal is 49% sugar. about how many ounces of sugar are in a 16 oz box of Krispy Krunch?

**MATH EMERGENCY**

Ok. That kind of makes sense.

**MATH EMERGENCY**

I still don't get it:\ Is C the y-intercept? or B? How do I know which one is greater or less? This is mind twisting, i don't get it

**MATH EMERGENCY**

Given Equation AX + BY + C = 0, which following conditions would be true for graph of line to have a negative slope and a postive y-intercept? A. A>0, B>0, C>0 B. A>0, B<0, C>0 C. A>0, B>0, C<0 D. A>0, B<0, C<0 I cant figure this out!

**ENGLISH**

ive done ten sentences, five are verb and five are adjective, please check. 1. Lily bought a pink cat mask for the halloween party. 2. Anna was covering her scar with makeup as she didn't want anyone to make fun of it. 3. Tory dressed up in disguise to scare his little ...

**ENGLISH**

Oh thank you. sentence number 4 needs to be longer, atleast ten words? how do i do that?

**ENGLISH**

Begin five sentences with the synonym of yellow. 1.Bumblebees collect nectar from flowers to create honey. 2.Daisies were Sally's favourite kinds of flowers as they always seemed to be happy and smiling. 3.Lemon was Andrew's favourtie gum flavour, as he likes sour. 4....

**ENGLISH**

write 5 sentnces using synomnyns of hide as 5 description and 5 verb. please help, atleast one sentence give to me using one description synonym of hide and one verb synonym of hide all in one sentence.

**englsh**

write 5 sentnces using synomnyns of hide as an adverb and adjective. 1. A thief dressed in a dark black outfit and a black mask came to the bank account to steal. i don't know how to do this sentence. Mask is an synomyn of hide. i think i have used it as adjective. but ...

**math**

nevermind i got it thanks anyway!

**math**

you are going to end up hating me i am really bad at dimensions so please bear with me. a dorm room your sister is considering seems small.the room is rectangular and has a perimeter of 42 feet. the room is 4 feet longer than its width. what are the dimensions of the room?

**math**

thank you so very much you are awesome i wish you were my math teacher!

**math**

yes it certainly is

**math**

im referring to the deminsions of a rectangle with a triangle with a hypotneuse of 5m in the top right corner

**math**

i have the deminsions of the rectangle but i need to know how to get it , the deminsions are 8m by 3m

**math**

the hypotneuse is 5 meters so how could i figure the dimensions of the rectangle out?

**math**

the perimeter of a rectangle is 22 meters, and the perimeter of the triangle is 12 meters. find the dimensions of the rectangle?

**algebra**

3x+4y

**Math**

i honestly think it is c. its the only one that makes sense.

**algebra**

y = 5x+40

**5th math**

1,000

**Trigonometary**

I'm using the sin formula. I've got w over 1.2 and I'm not sure whether I should multiply it out by 1.2 or by w? The formula looks like this sin20 = w/1.2

**Math**

I have a fraction x/1.2 If i multiply this fraction by x will I end up with the denominator on its own of 1.2x?

**economics**

I would think it would have been b. Because inflation is caused by an increase in money, decrease in money demand, decrease of goods, increase of demand for goods. So if inflation decreased there was more demand for money but no increase in good supply hence everything ...

**Math**

How to solve: There are 40 chickens and cows in the farmyard. There are 100 legs in all. How many are cows and how many are chickens

**chemistry**

use dimensional analysis and the heat vaporization table. Water = 40.7 kj/mol. Start with the information that you were given and make sure that all of your units cancel out! (65.0mL)(1.00g/1mL)(1 mole H2O/18.0g H2O)(40.7kj/1 mole H2O) = 146.9 kj. There are 3 significant ...

**Math**

What are the intercepts of F(x)=x^3-2x-6 and how do you find the answer? HELP!

**Geography**

Umm... does anyone know anything about Wave Break Island on the Gold Coast, Aus? I need to know why it was developed. I seriously need help!

**english**

for one robe it is: he/she was wearing a robe for more than on robes: wearing robes