# Posts by Emily

Total # Posts: 3,062

**calculus**

D. Plugging 2 into original fxn gives you y-coordinate. (2,6) Taking the derivative of y=(x^3)-x gives you f'(x)=3x^2-1. Plug in x=2 to find slope. use point slope form to get equation! :)

**Math**

sin^2 theta + 2 cos theta -1/ (sin^2 theta +3 cos theta-3= cos^2 theta+cos theta/ (-sin^2 theta) Prove the identity.

**chemistry**

Formula for specific heat:q/(m * delta t) Input given data: 35.2 J/(4.0 g * 20 c) Solve: 0.44 J/(g*c)

**Biology-Respiratory System**

What's the difference between capillaries, pulmonary artery and pulmonary vein?

**Math**

Prove this identity. State any restrictions on the variables. sin x/(tan x)= cos x

**Physics**

A satellite has a mass of 101 kg and is located at 1.99x10^6 m above Earth's surface. (a) What is the potential energy of the satellite at this location? (b) What is the magnitude of the gravitational force on the satellite? for potential energy, I was using the equation ...

**Physics**

A satellite has a mass of 101 kg and is located at 1.99x10^6 m above Earth's surface. (a) What is the potential energy of the satellite at this location? (b) What is the magnitude of the gravitational force on the satellite? for potential energy, I was using the equation ...

**Math**

Determine whether each general term defines a geometric sequence. Explain. a) f(n)= 2/(3n+1) b) f(n)= 11/(13^n)

**math**

I Don't know

**2nd grade math**

measure the perimeter to the nearest 1/2cm.

**statistics**

An Urn contains 7 red and 3 white balls. Two balls are drawn in succession without replacement. If the second ball is white, what is the probability that the first ball was white?

**8th grade**

what i think the legal age 4 drinking should be

**Algebra 2**

Need help on the #13-20. 13. What is the quotient of d − 2 ) d 4 − 6d 3 + d + 17 __________________ ? A. d 3 − 4d 2 − 8d − 15 R −13 B. d 3 − 8d 2 + 16d − 31 R 79 C. d 3 − 4d 2 + 9d + 35 D. d 3 − 8d 2 + 17d − 17 ...

**chemistry**

if you combust 30kg of octane (about the amount in one tank for a small car), how many kilograms of CO2 will you emit?

**chem 2**

What concentration of NaF is required in order to convert a 0.15M HF solution to a buffer with a pH of 5.50?

**Math**

Given angle theta is bigger than 0 and smaller than 360, determine two possible values of theta where each ration would be true. a) cos theta= 0.6951 b)sin theta= -0.7571

**Math**

Use the related acute angle to state an equivalent expression: a) tan 110 degrees b)sin 350 degrees

**Biology**

Explain your liver's role in changing your blood sugar level

**chemistry**

How much energy (in kilojoules) is needed to heat 5.45g of ice from -12.0 C to 32.0 C? The heat of fusion of water is 6.01kJ/mol, and the molar heat capacity is 36.6 J/(K x mol) for ice and 75.3 J/(k x mol) for liquid water

**Biology**

What is the lumen of the human digestive system?

**Physics**

how many sig figs do you use for estimated absolute uncertainties?

**Math**

Is RESP a form of annuity?

**physics**

A record player is spinning at 32 rpm when the motor is switched off. After 6.8 seconds the angular speed has decreased to 20 rpm. Calculate the frictional torque if the record player can be treated as a solid wheel of mass 2.4 kg and radius 15 cm. A) 476.47059 Nm B) 0.00499 ...

**need physics help**

2.1=0(.6)+.5(a)(.6^2) you can get drop the vit since vi=0. that will leave you with 2.1=.5a.6^2 multiply (.5)6^2 then you can divide 2.1 with the answer you got.

**physics help please**

The tub of a washer goes into its spin-dry cycle, starting from rest and reaching an angular speed of 6.0 rev/s in 12.0 s. At this point the person doing the laundry opens the lid, and a safety switch turns off the washer. The tub slows to rest in 11.0 s. Through how many ...

**Math**

Thanks!

**Math**

The hypotenuse of,c of right triangle ABC is 7.0 m long. A trigonometric ratio for angle A is given for four different triangles. Which one of these triangles has the greatest area? Justify your decision. a)sec A=1.7105 b)cos A=0.7512 c) csc A=2.2703 d)sin A= 0.1515

**Math**

In simple annuities, why is the amount of payment for the first deposit R(1+i)^n-1? Shouldn't it be n?

**8th grade**

how much water vapor is in 15 C

**math**

in addition to x=0, x=7 2[2x-7]+11=25 2[2x-7]=14 [2x-7]=7 2x=14 x=7 Check 2[2(7)-7]+11=25 2[7]+11=25 14+11=25 25=25 :D

**math**

You want to get the absolute value portion of the equation alone first. They you can find what x would equal if it were (2x-7) = blah and if -(2x-7) = blah.

**Math**

Nevermind, I was able to do it with synthetic division.

**Math**

How would I find the zeros of the function x^3 -7x +6 ? I know how to do with a x^2 term but, I'm confused as to how to do it when there isn't an x^2.

**Math**

In a geometric series, t1=12 and S3=372. What is the greatest possible value for t5? Justify your answer.

**Math**

cent, cent, scent equals 35128; how do you solve it?

**Math**

The 10th term of an arithmetic series is 34, and the sum of the first 20 terms is 710. Determine the 25th term.

**Science**

A gas filled balloon having a volume of 3.0 L at 1.1 atmosphere of pressure and a temperature of 22 C is allowed to rise into the stratosphere where the temperature and pressure are: - 28 C (note the negative sign) and 0.002 atmospheres , respectively. What is the approximate ...

**Calculus**

The volume of a cone of a radius r and height h is given by V=(3.14/3)(r^2)(h). If the radius and the height both increase at a constant rate of .5 cm per second, at what rate, in cubic cm per second, is the volume increasing when the height is 9cm and the radius is 6cm.

**Science**

Is sugar a covalent or ionic compound?

**Math**

why do you let n=1, 2 and 3?

**Math**

How do you get the general term for a sequence that has increasing common differences? For example: 1,2,4,7,11

**Math**

Thanks!

**Math**

Determine the 10th term of the sequence 3, 10, 28, 72, 176... State the general term.

**social studies**

guarentee

**social studies**

you should always read the ______ before you a buy a product... answer is 9 letters long third letter is an a...

**social studies**

if you own a factory the factory and any equipment in it are part of your... answer is 7 letters fourth letter is an i... i have been through everything in my study guide and cannot find the answer for this one...

**1**

omg i absolutely love you bobpursley! thankss for the help as well. =]

**Accounting**

I have a problem with management accounting However, I have trouble posting the question here Is it possible that i can send it to someone for their assistance

**Math(geometric sequences)**

sorry i meant 4

**Math(geometric sequences)**

sorry i subbed 10 into it, and it was wrong.

**Math(geometric sequences)**

A certain antibiotic reduces the number of bacteria in your body by 10% each does. a)If four does of the antibiotic are taken, what percent of the original bacterial population is left? I think the formula is supposed to be tn=100(9/10)^-1, but when i substituted 1 into it, ...

**US History**

1 b 2 c 3 a 4 d

**5th grade**

I don't now

**5th grade science/ colloids**

what are some examples of colloids? like a mixture,compound or sometin.... im looking for something like a colloid is water and oil mixed together and so on. thx :)

**1st grade**

In the past, Lucy was a great singer.

**chemistry**

Light with a wavelength of 405 nm fell on a strontium surface, and electrons were ejected. If the speed of an ejected electron is 3.49 105 m/s, what energy was expended in removing the electron from the metal? Express the answer in joules (per electron) and in kilojoules per ...

**chemistry**

Calculate the shortest wavelength of visible light (in nanometers) seen in the spectrum of the hydrogen atom. nm What are the principle quantum numbers for the levels in this transition?

**chemistry**

What is the wavelength of the transition from n = 2 to n = 1 for Li2+? Li2+ is a hydrogen-like ion. Such an ion has a nucleus of charge +Ze and a single electron outside this nucleus. The energy levels of the ion are -Z2RH/n2, where Z is the atomic number. nm In what region of...

**chemistry**

What is the de Broglie wavelength of an oxygen molecule, O2, traveling at 503 m/s?

**chemistry**

Calculate the frequency of electromagnetic radiation emitted by the hydrogen atom in the electron transition from n = 7 to n = 6.

**math**

jasmine is helping her father plant trees to create a border around their back yard jasmine plants a treesevery 25 and her father plants a tree every 15 minutes if they started together how long before they would finsh planting a treee at the same time

**math**

slove the folowing eqaution negtive 23=x+35

**geometry**

the quadrilateral has a pweimeter of 60 meters. mp and no are congruent the length of mn is 10 meters and the length of no is 15 meters what is the length of po

**analytical chemistry**

blank is used to dissipate the error brought about by impurities. What is the other reason of using blank in Mohr method?

**English**

I have a few question on linking verbs: 1. I am fond of both kinds of comics. linking verb - fond? 2. Joseph Pulitzer was the first to publish color funnies. linking verb - was? 3. The sales of his newspaper were high. linking verb - sales 4. Sunday Funnies soon became part of...

**physics**

What is the approximate mass of air in a living room 6.0 m times 3.9 m times 2.7 m?

**PHYSICS ---HELP!**

Suppose there is a circular metal disk spinning at a constant angular velocity. Now imagine near to, but not in contact with the first disk, there is an identical metal disk spinning at the same angular velocity but in the opposite direction (ie. W1 = -w2) and the surfaces are...

**Physics-- Please Help!!**

Suppose there is a circular metal disk spinning at a constant angular velocity. Now imagine near to, but not in contact with the first disk, there is an identical metal disk spinning at the same angular velocity but in the opposite direction (ie. W1 = -w2) and the surfaces are...

**chemistry**

How much heat is released when a mixture containing 12.6 g CS2 and 12.6 g Cl2 reacts by the following equation? CS2(g) + 3 Cl2(g) → S2Cl2(g) + CCl4(g) ΔH° = −230. kJ

**chemistry**

How many grams of oxygen gas are required to produce 7.46 kJ of heat when hydrogen gas burns at constant pressure to produce gaseous water? 2 H2(g) + O2(g) → 2 H2O(g) ΔH = −484 kJ Liquid water has a heat of vaporization of 44.0 kJ per mole at 25°C.

**chemistry**

Calculate the heat released when 4.260 L Cl2 with a density of 2.46 g/L at 25°C reacts with an excess of sodium metal to form solid sodium chloride at 25°C.

**chemistry**

A 19.5-g sample of a metal was heated to 61.67°C. When the metal was placed into 26.5 g of water in a calorimeter, the temperature of the water increased from 25.00°C to 30.00°C. What is the specific heat of the metal?

**Chemistry**

Hydrogen cyanide is a highly poisonous, volatile liquid. It can be prepared by the following reaction. CH4(g) + NH3(g) → HCN(g) + 3 H2(g) What is the heat of reaction at constant pressure? Use the following thermochemical equations. N2(g) + 3 H2(g) → 2 NH3(g) Δ...

**Math**

An auditorium has 50 rows of seats. The first row has 20 seats, the second row has 21, the third row has 22 seats, and so on, each row having one more seat than the previous row. How many seats are there all together? a. write 2 different expressions for the total number of ...

**trig**

If a=8, the angle C=50 degrees and the angle A=35 degrees find the other angle B and the remaining b and c sides. Give your answer to at least 3 decimal places.

**physics**

Consider a hoola-hoop of radius R and it is spinning about its symmetry axis at a constant angular velocity. Now, I double its mass and halve its angular velocity. What is the new angular momentum in terms of the initial angular momentum?

**physics**

With acceleration of 2500 m/s2, how long will it take to rreach speed of light

**physics**

With acceleration of 2500 m/s2, how long will it take to rreach speed of light

**English**

Thank you so much. I think I get it!

**English**

Zoo keepers harvest bamboo for Pandas harvest = transitive? In China people eat the tender shoots as a vegetable. eat = transitive?

**English**

last two, I think I am getting it... Zoo keepers harvest bamboo for Pandas harvest = transitive? In China people eat the tender shoots as a vegetable. eat = intransitive?

**English**

Asian farmers live in bamboo houses? live = intransitive? Their sandals are made from bamboo strips. made = intransitive? Peoples sometimes sleep on bamboo mats. sleep = intransitive? In some countries, bamboo cages hold animals. hold = transitive?

**English**

Asian farmers live in bamboo houses? live = transitive? Their sandals are made from bamboo strips. made = transitive? Peoples sometimes sleep on bamboo mats. sleep = transitive? In some countries, bamboo cages hold animals. hold = transitive?

**English**

The Size might suprise you. suprise = transitive Some reach a height of 120 feet. reach = transitive The Japanese also make flutes from these stems. make - transitive

**English**

I am trying to figure out transitive or intransitive.... It is related to wheat, oats and barley. related = intransitive? The stems measure a foot in diameter. measures - transitive? Engineers strengthen concrete with it. Intransitive?

**Chemistry**

What is the temperature (in kelvins) at which 0.0260 mol occupies 1.00 L at 0.563 atm?

**Biology**

also located on the X chromosome is a gene that codes for deafness. This gene is recessive. a black female cat that is heterozygous for deafness (Dd) is crossed with a yellow cat that is not deaf What is the Punnet Square . and must use two letters on the x chromosome

**algebra**

what does x equal in this equation?1/2+7x/10=13/20

**Biology**

Thanks

**Biology**

Why do we perform aerobic respiration when we're resting and both aerobic and anaerobic respiration while we're running?

**math**

A low ha this paper sux ):

**math**

352$ for mae assurian and sally got $4.44 cents for 148 newspapers.

**Applied statistics for business and economics**

I apologize, 3 of the above answers are not correct. * a. 0.0498 * b. 0.0000 c. correct * d. 0.0038 e. correct f. correct

**Applied statistics for business and economics**

a. 0.9998 b. 0.0002 c. 0.0504 d. 0.0224 e. 3 cards f. 1.731877594 (rounded 1.7319)

**Math**

Thank you!

**Math**

For what values of k does the function f(x)=(k+1)x^2+2kx+k-1 have no zeros? One zero? Two zeros?

**Physics**

average acceleration in m/s squared

**Physics**

A sports car accelerates from rest to 89 km/h in 6.1s . What is its average acceleration in

**Physics**

A sports car accelerates from rest to 89 km/h in 6.1s . What is its average acceleration in

**Physics**

If you are driving 100km/h along a straight road and you look to the side for 1.9s , how far do you travel during this inattentive period?