# Posts by Chris

Total # Posts: 2,708

**Science**

What does sc mean on all jewlry items

**Math**

What does sc mean on all jewlry items

**Math**

On Feb. 27th, 2010, an earthquake of magnitude 8.8 occurred off the coast of Chile lasting up to 3 minutes. Five months later, a 2nd earthquake occurred with magnitude of 5.3. How much more intense was the first earthquake compared to the 2nd earthquake?

**Chemistry**

Equation of Mg(OH)2 (aq) + KOH (aq) gives you what ?

**math**

the building supply store sells one liter bottles of water for $1.09 approximately how many 8 ounce servings of water in 1 liter

**chemistry**

What is the difference between the acid and base notation of a hydroxide? Give an example of the same molecular formula written in acid and base notation.

**financial management**

Angela Anderson is employed as a Tax Manager by Super Cell Phone Service, Inc. She earns $135,000 per year in this role, supervising a department of five Tax Accountants. Calculate the Medicare taxes that will be withheld from Angela’s annual salary assuming a tax rate of...

**English**

People who don’t know Harry tend to underestimate him. They cast a skeptical eye on his typical outfit: ragged jeans and shirts that bear evidence of his most recent meal. And his most frequently uttered expression, “Waaaal, I just don’t know,” can make ...

**Math**

suppose that when your friend was born your friends parents deposited $4000 in an account paying 4.1% interest compounded quarterly. what will the account balance be after 15 years?

**Math**

1/180

**math**

a plat form and a building are on the same horizontal plane , the angle of depression of the bottom of the building from the top A of the platform is 39 degree. the angle of elevation of the top D of the building from the top of the platform is 56 degree. given that the ...

**Chemistry**

When chromium has 26 electrons, how many neutrons and protons does it have and what is it's standard notation

**Calculus**

Farmer Jones, and his wife, Dr. Jones, decide to build a fence in their field, to keep the sheep safe. Since Dr. Jones is a mathematician, she suggests building fences described by y=4x^2 and x^2+10. Farmer Jones thinks this would be much harder than just building an enclosure...

**Math 3**

How many times bigger is 8*10^6 than 2*10^2?

**Maths**

If a car weighing 1,054kg collides with another car and then takes 60 metres to come to rest can the speed at the pint of impact be calculated?

**Math**

it's 4 because 3+3=6 and 4+2=6

**Trig**

Problem: A cable from the top of a 60 foot high tower is to be attached to the ground (x) feet from the base of the tower. A) if the cable makes an angle of t radians with the ground when attached, express t as a function of x. B) if t = pi/5, how far is the end of the cable ...

**PHYSICS SPECIFIC GRAVITY**

A 6.8 kg block of some unknown material is suspended from a spring scale and submerged in water. The spring scale reads 48.0 N. What is the specific gravity of the block?

**science**

H2SO4 is labeled 93.2% and density 1.94g/cm3. Find moles in H2SO4?

**Chemistry**

Hello Dr. Bob, I see the mistake that I have made, but the initial values that were in my first sentence were given, I just think my coefficients in the equation were wrong. Do the answers at the bottom make sense though?

**Chemistry**

A flask initially contains 2.00 atm of NH3, 2.00 atm of N2, and 3.00 atm of H2 at 673 Kelvin. -What is the delta G for the reaction? -What is the equilibrium partial pressures of each gas at 673 Kelvin? So I figured out how to do the first question with relevant values: : ...

**Algebra**

7 – 5(2 – x) = –(x – 8) = 11/6

**Math**

Evaluate: -17 + 6 =

**math**

Lines a and b are parallel. When they are cut by transversals, they form a triangle. es025-1.jpg What is es025-2.jpg es025-3.jpg

**Chem**

Given the equation 2C8H18 + 25O2 = 16 CO2 + 18H2O: How many moles of oxygen gas (O2) are consumed upon combustion of 2.20 L of octane ( D = 0.703 g/mL)?

**Work**

A truck carrying a 57 kg crate accelerates uniformly from rest to 86.5 km/hr in 18.4 s. Calculate the work done on the crate by the truck (in J). I got 16454 J right. Now why is it positive? K-K = negative if Velocity from rest is 0.

**Block Colliding with a Spring**

I think there something wrong with the quiz, cuz it tells me its wrong. I tried 3.75N (work by spring) and also total work done. It shouldnt be, I got the 2 other questions right. Still, thank you.

**Block Colliding with a Spring**

A moving 1.60 kg block collides with a horizontal spring whose spring constant is 480 N/m. The block compresses the spring a maximum distance of 12.50 cm from its rest position. The coefficient of kinetic friction between the block and the horizontal surface is 0.480. What is ...

**PHYSICS CENTER OF MASS**

what is the .065??? same for y .065???

**chemistry**

A radionuclide undergoes alpha emission, and thorium-234 is produced. What was the original radionuclide?

**math**

Can you plz do callbck for 0799998736&0742239920 then i will call u as soon as i can to tell u anything about careers

**Math**

A student takes a true-false test exam with 10 questions. If the student guesses all ten questions, find the probability he gets 7 or 8 right. p(x=7) + p(x=8) (.5)^7(.5)^3 + (.5)^8(.5)^2 I have the correct answers which are .117+.044= .161 But when I calculate the answer on ...

**Chemistry**

A single dose of a certain antacid contains 250. mg of Mg(OH)2 and 300. mg of CaCO3. How many mmol of H+ can be neutralized by one dose of this antacid? Do not include units in your answer

**math**

the product of a number and five decreased by eight

**math**

use the unit circle to determine the exact value of each angle: sine 30 degrees, cosine pi, sine 11 pi divided by 6, and cosine 135 degrees.

**math**

find the values of cosine 21 degrees, and sine 3 pi divided by 10

**math**

The Washington monument is 555 feet high. If you are standing one quarter of a mile, or 1320 feet, from the base of the monument and looking at the top, find the angle of elevation to the nearest degree.

**math**

At a certain time of the day the elevation of the sun is 40 degrees. To the nearest foot, find the height of a tree whose shadow is 35 feet long.

**Math troubles**

I calculated them on my calculator so I borrowed my friends (since mine was messing up). I got P(x=3) = 5C3 .25^3 .75^2 = 0.008 P(x=4) = 5C4 .25^4 .75^1 = 0.003 P(x=5) = 5C5 .25^5 .75^0 = 0.0007 added up =0.01. Did I calculate correctly

**Math troubles**

There's 5 multiple choice questions on a quiz. Four choices to each question. Find the probability that the student gets 3 or more questions right. p(x=3) (.25)^3= 0.015 p(x=4) (.25)^4=3.906 p(x=5) (.25)^5=9.765 Do you add them all together to get the overall probability?

**Statistics**

There's 5 multiple choice questions on a quiz. Four choices to each question. Find the probability that the student gets 3 or more questions right. p(x=3) (.25)^3= 0.015 p(x=4) (.25)^4=3.906 p(x=5) (.25)^5=9.765 Do you add them all together to get the overall probability?

**Social Studies PLS HELP!!!**

Jury duty is A: a right because it is discussed in the u.s constitution B: a right because only some citizens are required to do it C: A responsibility because citizens do it to help protect other's rights D: A responsibility because judges cannot make decisions without ...

**math**

a nut mixture is made from two types of nuts: one type selling for 7.50/kg the other selling for 9.50/kg what mass of each type of nut should ne included in a 3 kg mixture that sells for 25

**Chemistry**

Using the Table of Thermodynamic Data calculate Kp at 500 K for the reaction 2 HI(g)-->I2(g) + H2(g) , if Kp at 300 K is 2.16x10-3 , assuming that delta H˚ is constant.

**Chemistry**

The Kp for the production of phosgene is 18.0. If one mole each of CO and Cl2 are mixed at the total pressure of 1 atm, what will be the partial pressure (in atm) of COCl2 after equilibrium is reached, CO(g) + Cl2(g)-->COCl2(g)

**Chemistry**

What is the entropy change of liquid glycol (in cal K-1 mol-1 ) when it freezes at -25 ˚C?the heat of fusion of glycol is 2688 cal mol-1 , and the specific heats of liquid and solid glycol are 33.8 and 20.1 cal K-1 mol-1 , respectively.

**Maths**

The probability a pupil takes a bus to school is 0.3. If a sample of 10 pupils are chosen at random. Using binomial distribution. Find the probability that a) exactly four pupils travel by bus. b) more than six pupils travel by bus.

**ratios/algebra**

During class elections 64 students voted for candidate A .if the ratio of votes for candidate a is to the votes for candidate B was 8:5,how many votes did candidate B receive?

**Science**

Heat ice from 20 to 32= 6BTUx5lb=30 Melt Ice at 32=144x5lb=720 Change temp of water from 32to160=128x5LB=640 30+720+640=1390 Correct? I think I got it. Thanks for the help. Cleared a lot of things up.

**Science**

How many Btu's are required to change five pounds of ice at 20°F to water at 160°F? a. 2,608 Btu’s b. 1,390 Btu’s c. 1,304 Btu’s d. 141 Btu’s I am trying ((160-20)x.5)x5 but not getting any of the possible choices. What am I missing? Thanks for ...

**Maths**

A drawer contains 8 brown socks and 4 black socks. A sock is taken a random from the drawer, its colour noted and replaced. This is done three times. If X is the discrete variable, the number of brown socks taken. Draw the probability distribution of X.

**statistics**

Case Study Chapter 6 and 7 FOR FULL CREDIT SHOW EQUATIONS USED AND WORK. ELEVATOR CAPACITY: Suppose an elevator has a maximum capacity of 16 passengers with a total weight of 2500 lbs. The mean weight of females is less than the mean weight of males so we will only look at ...

**Math**

need direction on part c. Rosa and her friend build & paint a tree house. On monday they paint 2/5 of the tree house. On tuesday they paint 3/7 of the house. A - painting of the house need to be finished on wednesday. how much more work do they have to do? 14/35 + 15/35=29/35 ...

**Art**

Frosty is right

**physics**

Calculate the heat given off by the hot water. GIVEN: Original quantity of water (hot water) 50g Orig.temperature :40°C Final temperature: 9°C Final quantity of water: 264g Increase in quantity of water 214g. PLEASE KINDLY SHOW ME THE EQUATION FOR THIS THANK YOU. <3

**physics**

Calculate the heat given off by the hot water. GIVEN: Original quantity of water (hot water) 50g Orig.temperature :40°C Final temperature: 9°C Final quantity of water: 264g Increase in quantity of water 214g. PLEASE KINDLY SHOW ME THE EQUATION FOR THIS THANK YOU. <3

**physics**

Calculate the heat given off by the hot water. GIVEN: Original quantity of water (hot water) 50g Orig.temperature :40°C Final temperature: 9°C Final quantity of water: 264g Increase in quantity of water 214g. PLEASE KINDLY SHOW ME THE EQUATION FOR THIS THANK YOU. <3

**physics**

Calculate the heat given off by the hot water. GIVEN: Original quantity of water (hot water) 50g Orig.temperature :40°C Final temperature: 9°C Final quantity of water: 264g Increase in quantity of water 214g. PLEASE KINDLY SHOW ME THE EQUATION FOR THIS THANK YOU. <3

**microeconomics**

4.00 or less .

**N/A**

The most basic software required for an online course where writing is involved is:

**Chemistry**

How many mL of 1.2 M HCl is needed to react with 5.8 g of Al(OH)3

**science**

A feather is dropped on the moon from a height of 1.40meters.The acceleration of gravity on the moon is 1.67m/s^2.Determine the time for the feather to fall to the surface of the moon.

**Math**

Kathy is y years old Find her age,if 1/2 of wat she was 3 years ago is equal to 1/3 of what she will be in 4 years time

**Assessment**

Authentic and performance assessments strive for greater realism and complexity of tasks under the premise that real-life problems can often be solved ______________.

**MATH HELP**

its not b

**Math**

If Sam has 6 apples and Linda takes 12 apples how many apples does Jesica have?

**Trigonometric**

A woman standing on a hill sees a flagpole that she knows is 55 ft tall. The angle of depression to the bottom of the pole is 14°, and the angle of elevation to the top of the pole is 18°. Find her distance x from the pole.

**Physics**

A bat moving at 5 meters per second is chasing a flying insect, if the bat emits a 40 khz chirp and receives back an echo at 40.4 khz what is the speed of the insect and will the bat be able to catch the insect?

**Math**

I got A and B but i need C Suppose a ship is sailing at a rate of 35km/h parellel to a straight shoreline. The ship is 10km from shore when it passes a lighthouse at 11am. a) Let k be the distance between the lighthouse and the ship. Let d be the distance from the ship has ...

**Math**

I got A and B but i need C Suppose a ship is sailing at a rate of 35km/h parellel to a straight shoreline. The ship is 10km from shore when it passes a lighthouse at 11am. Question 6 a) Let k be the distance between the lighthouse and the ship. Let d be the distance from the ...

**COMP1**

Heading back to the states but on edge since he survived the tsunami FRAGMENT OR NO

**Math**

wait I'm confused with c what do i do or put

**Math**

So b) i would just say d=35km *t

**Math**

Thank you guys both of you!

**Math**

Someone answer all of this clearly, I don't get it at all. Suppose a ship is sailing at a rate of 35km/h parellel to a straight shoreline. The ship is 10km from shore when it passes a lighthouse at 11am. Question 6 options: a) Let k be the distance between the lighthouse ...

**Science**

A tank which is raised above the ground level, has a hole in its flat base, through which water flows and falls to the ground below. If the depth of water in the tank is 0.5 m and the tank base is 0.7 m above the ground, what is the fluid velocity (u) (m/s) just before it ...

**Math**

Someone answer all of this clearly, I don't get it at all. Suppose a ship is sailing at a rate of 35km/h parellel to a straight shoreline. The ship is 10km from shore when it passes a lighthouse at 11am. Question 6 options: a) Let k be the distance between the lighthouse ...

**Math**

whats the composite function of these two equations and its domain and range f(x)=2^x and g(x)=3-x

**Math**

The answer is 306.

**Math**

Can you explain or show me how to do this problem: Mary bought 8 1/2 yards of ribbon. How many inches did she buy?

**chemistry**

How much energy is absorbed to change 7.25 g of ice at -3 C to 25.5C?

**Math**

Edit for g(x) i mean g(x)=3-x

**Math**

How about this idk if im right for this part F(x)=2^x g(x)=y-x

**Math**

What is the composite function of 3x^2-5x+6 and x^2+3x and what is its domain and range

**Math**

Help me for this question on composite functions Does the composition of functions display the commutative property? Give an example of each case to illustrate your answer.

**Equations and Inequalities Unit Test**

are these right one or what

**Math**

If a1,a2,…,a100 are real numbers such that a1=1 and a100=.01, evaluate ∑(j=1 to 99) (aj−aj+1).

**Math**

Finding the composite function

**Math**

Question 1 A) f(x)=2^x and g(x)=3−x I got 3x^2+12 don't know if im right B) i need help for this f(x)=sinx and g(x)=x

**Math**

We need help putting these fractions from greatest to least 2/3 3/4 1/2 8/10

**Math**

When I convert 400 quarts to 4000 Cups would the answer be 400 qt= 1600 cups and 4000 C < 400 qt?

**Math**

is the answer 4000 cups < 400 quarts because 400 quarts= 1600 Cups? Is it right?

**Math**

i have this so far 8=-8cos(pi/30(0-y))+8

**Math**

the value

**Math**

how can i solve for y value with this equation f(x)=-8cos(pi/30(x-y))+8

**Math**

Change the cos function into a sin function d(t)= -8cos (pi(t)/30)+8

**Math**

i mean the y value,change it to sin function

**Math**

Solve for d D(t)= -8cos (pi(t)/30)+8

**Math**

solve for d i mean

**Math**

Error I mean for d