Friday

January 20, 2017
Total # Posts: 2,670

**chemistry**

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

*April 7, 2016*

**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

*April 7, 2016*

**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 ...

*March 30, 2016*

**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

*March 29, 2016*

**math**

the product of a number and five decreased by eight

*March 29, 2016*

**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.

*March 28, 2016*

**math**

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

*March 28, 2016*

**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.

*March 28, 2016*

**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.

*March 28, 2016*

**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

*March 27, 2016*

**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?

*March 27, 2016*

**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?

*March 27, 2016*

**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 ...

*March 24, 2016*

**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

*March 24, 2016*

**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.

*March 23, 2016*

**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)

*March 23, 2016*

**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.

*March 23, 2016*

**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.

*March 20, 2016*

**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?

*March 14, 2016*

**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.

*March 13, 2016*

**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 ...

*March 13, 2016*

**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.

*March 13, 2016*

**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 ...

*March 7, 2016*

**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 ...

*February 29, 2016*

**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

*February 28, 2016*

**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

*February 28, 2016*

**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

*February 28, 2016*

**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

*February 28, 2016*

**microeconomics**

4.00 or less .

*February 27, 2016*

**N/A**

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

*February 23, 2016*

**Chemistry**

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

*February 18, 2016*

**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.

*February 18, 2016*

**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

*February 16, 2016*

**Assessment**

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

*February 14, 2016*

**Math**

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

*February 9, 2016*

**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.

*February 7, 2016*

**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?

*February 2, 2016*

**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 ...

*February 1, 2016*

**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 ...

*February 1, 2016*

**COMP1**

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

*January 31, 2016*

**Math**

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

*January 27, 2016*

**Math**

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

*January 27, 2016*

**Math**

Thank you guys both of you!

*January 27, 2016*

**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 ...

*January 27, 2016*

**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 ...

*January 27, 2016*

**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 ...

*January 26, 2016*

**Math**

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

*January 25, 2016*

**Math**

The answer is 306.

*January 25, 2016*

**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?

*January 25, 2016*

**chemistry**

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

*January 25, 2016*

**Math**

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

*January 25, 2016*

**Math**

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

*January 25, 2016*

**Math**

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

*January 25, 2016*

**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.

*January 24, 2016*

**Math**

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

*January 14, 2016*

**Math**

Finding the composite function

*January 13, 2016*

**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

*January 13, 2016*

**Math**

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

*January 12, 2016*

**Math**

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

*January 10, 2016*

**Math**

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

*January 10, 2016*

**Math**

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

*January 6, 2016*

**Math**

the value

*January 6, 2016*

**Math**

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

*January 6, 2016*

**Math**

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

*January 6, 2016*

**Math**

i mean the y value,change it to sin function

*January 6, 2016*

**Math**

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

*January 6, 2016*

**Math**

solve for d i mean

*January 5, 2016*

**Math**

Error I mean for d

*January 5, 2016*

**Math**

how do i solve for t and turn this equation into a sin function d(t)=-8cos(pi(t)/30)+8

*January 5, 2016*

**Math**

For each of the functions below, state the domain and range, the restrictions, the intervals of increasing and decreasing, the roots, y-intercepts, and vertices. a) f(x)=2x(^2)−8 b) f(x)=+√x-2

*January 3, 2016*

**English 3**

A verb must agree with its subject in number

*January 3, 2016*

**Math Exponetial Function Problem Question?**

Thank you so much damon!!

*January 2, 2016*

**Math Exponetial Function Problem Question?**

Im confused if im doing this right Last week there was an earthquake that measured as a magnitude of 3.2 on the Richter scale. Today you hear on the radio that there was a second earthquake that was 27 times more intense than the first. What was the magnitude of the second ...

*January 2, 2016*

**Math**

*86.4 i mean

*January 2, 2016*

**Math**

Are you sure this is right,someone told me since to get magmitude of the second i have to multiply 27 by first earthquake which is 3.2 27(3.2)=84 Im confused

*January 2, 2016*

**Math**

Ok,thanks!

*January 2, 2016*

**Math**

solve for x using logarithms round your answer to four decimal places. a)2^2x+3=80

*January 2, 2016*

**Math**

So i guess my answer is acceptable right :)

*January 2, 2016*

**Math**

For a)

*January 2, 2016*

**Math**

Okay i was wondering because some people told me the answer is log(f(x))=2xlog(3)

*January 2, 2016*

**Math**

I don't if I'm right for these two questions i just need a check if I'm right,if I'm wrong please show me how to get that answer. Rewrite the following exponential functions as logarithmic functions a)f(x)=9^x ans:f(x) Log^-1(xlog(9)) b)f(x)=(7/8)^x ans:log^-1(...

*January 2, 2016*

**Math Logarithmic Question**

Solve for all possible values of x within the domain of the following logarithmic expressions. a)logx+log2=log7−log3

*January 1, 2016*

**Math**

Logrithmetic Problem question Last week there was an earthquake that measured as a magnitude of 3.2 on the Richter scale. Today you hear on the radio that there was a second earthquake that was 27 times more intense than the first. What was the magnitude of the second ...

*January 1, 2016*

**Math**

Exponetial Functions In the following exponential relations, solve for x using logarithms. Round your answers to 4 decimal places. a) 5^3x=65 b) 2^2x+3=80

*January 1, 2016*

**Math**

error i mean f(x)=(2)^x-7

*December 31, 2015*

**Math**

For the following function, state: i. the domain and range ii. the y-intercept, and iii. the horizontal asymptote f(x)=(2)x−7

*December 31, 2015*

**Math**

Describe the Transformations For Each Function a)f(x)=3sin(1/2x+pi/2)+1 b)-1/3cos(2x-pi)-2

*December 25, 2015*

**Math**

The temperature, throughout the year, in a particular town can be graphed using trigonometric functions. On July 24th, the hottest day of the year, the temperature is 27 degrees Celsius. On Jan. 24th, the coldest day of the year, the temperature is -11 degrees Celsius. ...

*December 22, 2015*

**Trignometric Functions**

The temperature, throughout the year, in a particular town can be graphed using trigonometric functions. On July 24th, the hottest day of the year, the temperature is 27 degrees Celsius. On Jan. 24th, the coldest day of the year, the temperature is -11 degrees Celsius. ...

*December 22, 2015*

**math**

You put $1,000 into a savings account today that offers a 5% APR with semi-annual compounding (i.e., two times per year).

*December 22, 2015*

**math**

What is the effective annual rate on the loan? (I.e., what is the interest rate once we take into account compounding?)

*December 21, 2015*

**math**

$400,000 for 30-years at a fixed APR of 3.87%. The loan payments are monthly and interest is compounded monthly.

*December 21, 2015*

**Math**

For a stat class the mean of the midterm is 75 with a standard deviation of 7. What percentage of students scored between 67 and 83

*December 21, 2015*

**Marketing**

We want to advertise a service that we can use the phrase "Save 40! Either % or $ - You Choose. What would the retail amount of that service be if the amount of savings in dollars were 40 and the percent savings were 40? Assume zero cost. List price and sell price would ...

*December 16, 2015*

**physics**

A golf ball is dropped from rest from a height of 8.30 m. It hits the pavement, then bounces back up, rising just 5.00 m before falling back down again. A boy then catches the ball when it is 1.10 m above the pavement. Ignoring air resistance, calculate the total amount of ...

*December 16, 2015*

**physics**

A model rocket blasts off from the ground, rising straight upward with a constant acceleration that has a magnitude of 90.3 m/s2 for 1.75 seconds, at which point its fuel abruptly runs out. Air resistance has no effect on its flight. What maximum altitude (above the ground) ...

*December 16, 2015*

**physics**

A golfer rides in a golf cart at an average speed of 3.93 m/s for 43.3 s. She then gets out of the cart and starts walking at an average speed of 1.13 m/s. For how long (in seconds) must she walk if her average speed for the entire trip, riding and walking, is 1.99 m/s?

*December 16, 2015*

**physics**

A projectile is launched from and returns to ground level, as the figure shows. There is no air resistance. The horizontal range of the projectile is measured to be R= 166 m, and the horizontal component of the launch velocity is v0x = 26.0 m/s. Find the vertical component v0y...

*December 16, 2015*

**physics**

Traveling at a speed of 16.5 m/s, the driver of an automobile suddenly locks the wheels by slamming on the brakes. The coefficient of kinetic friction between the tires and the road is 0.590. What is the speed of the automobile after 1.35 s have elapsed? Ignore the effects of...

*December 16, 2015*

**Business Math**

Mortgage lenders base the mortgage interest rate they offer you on your credit rating. This makes it financially critical to maintain a credit score of 700 or higher. How much more interest would you pay on a $193,000 home if you put 20% down and financed the remaining with a ...

*November 29, 2015*