Wednesday

April 1, 2015

April 1, 2015

Total # Posts: 762

**Chemistry**

56mL of a stock solution of hydrobromic acid, HBr, is added to 85mL of water, yielding a solution having a pH of 1.0. What was the molarity of the stock solution? I know Molarity = moles of solute/ liters of solution
*March 31, 2015*

**Physics **

Cart A has a mass of 10kg and is moving towards cart B at a speed of 15 m/s. If cart B is moving towards cart A with a speed of 5 m/s, what mass must Cart B have to stop both carts upon collision?
*March 26, 2015*

**Calculus **

A manufacture has been selling 1300 television sets a week at $420 each. A market survey indicates that for each $16 rebate offered to a buyer, the number of sets sold will increase by 160 per week. a) Find the price p(x) of each television as a function of x, where x is the ...
*March 25, 2015*

**Calculus**

A model for the food-price index (the price of a representative "basket" of foods) between 1984 and 1994 is given by the function I(t)=0.00009045t5+0.001438t4−0.06561t3+0.4598t2−.6270t+99.33 Where t is measured in years since midyear 1984, so 0≤t&#...
*March 25, 2015*

**Calculus**

The manager of a large apartment complex knows from experience that 80 units will be occupied if the rent is 460 dollars per month. A market survey suggests that, on the average, one additional unit will remain vacant for each 10 dollar increase in rent. Similarly, one ...
*March 25, 2015*

**math **

The outside diameter of a pipe is 5 and 7/32 inches. The walls of the pipe are 5/32 inches thick. find the inside diameter
*March 12, 2015*

**math**

You have 160 boxes of cookies. In each case you can pack 8 boxes of cookies. How many cases would be filled from these boxes of cookies? I'm not sure if i do 160*8 or what i believe its 20 instead of 1280
*March 12, 2015*

**math**

ok thanks
*March 12, 2015*

**math**

The temperature dropped from 6 Celsius to -5 Celsius. How many degrees did the temperature drop?
*March 12, 2015*

**Child education**

As Ms. Ramirez planned for her group time, she considered the best way to begin. Which one of the following would NOT be an effective way for her to begin group time? A. Asking individual children if they brought something to share B. Leading children in the finger play "...
*March 3, 2015*

**Chemistry**

Calculate the number of grams of propane (C3H8) consumed if 17.7 g of water is produced according to the reaction: C3H8(g)+5O2(g)=3CO2(g)+4H2O(g)
*February 16, 2015*

**chemistry**

A freezing point depression experiment was conducted using cyclohexane as the solvent. The freezing point of pure cyclohexane is 6.60°C and the freezing point depression constant is 20.00°C/m. The freezing point of a solution containing 0.135 g of an unknown ...
*February 16, 2015*

**Math**

A math teacher wishes to use groups of 5 and/or 7 students for a class assignment. When she tries to make assignments she notices that it cannot be done with the number of students in her class. However, if the number of students were any larger, the assignments could be made...
*January 30, 2015*

**math**

how can you rename a mixed number to help you subtract
*January 26, 2015*

**math**

Jamal made a list of fractions and asked Will to find the fraction written in simplest form. Which fraction should Will choose? 1/8, 3/89, 9/18, 6/10?
*January 13, 2015*

**english**

In the following sentence identify the appositive or appositive phrase and the noun or pronoun renamed by the appositive. Mr. Murray, the Scoutmaster, likes to hike. Appositive: Noun or pronoun renamed:
*January 12, 2015*

**math**

what is 8/100, 3/5, 7/10 least to greatest
*January 12, 2015*

**Geometry**

The sides of a triangle have lengths of 9, 11, and 16 units. What is the perimeter of a similar triangle with its longest side 24 units in length?
*January 8, 2015*

**Math**

Ava, Keirra, and Victoria ate exactly 3/4 of their candy bars. Ava ate 3 pieces, Kierra ate 6 pieces and Victoria ate 9 pieces. How is this possible?
*January 7, 2015*

**math**

Tyler is thinking of a number that is divisible by 2 and 3. By which of the following numbers must Tyler's number also be divisible? 6? 8? 9? 12?
*January 6, 2015*

**math**

I am a number between 60 and a 100. My ones digit is 2 less than my tens digit. I am a prime number. What am I? Explain.
*December 9, 2014*

**math**

The factors of a number include 2, 3, 4, 6, 8, 12, 16, 32, and 48. Which could be the number?
*December 9, 2014*

**math**

Manny makes dinner using 1 box of pasta and 1 jar of sauce. If pasta is sold in pckages of 6 boxes and sauce is sold in packages of 3 jars, what is the least number of dinners that Manny can make without any supplies left over?
*December 9, 2014*

**Child Development**

What kind of teacher are you to say my answers are laughable?
*December 8, 2014*

**Child Development **

Please Check my answers 1. A type of communication that isn't only about the present and that promotes higher level thinking such as planning and reminiscing is called A. child-child conversation. B. chanting. C. early production. D. decontextualized talk. ANSWER: A 2. ...
*December 8, 2014*

**Child Development**

I corrected the other ones that were wrong can you please check them? Thank you:) 2) B 4) D 8) A 9) C 10) A 11) D
*December 4, 2014*

**Child Development**

Can you check these? 1a) The recording method that's most useful in discovering the causes or results of a child's behavior is A. rating scale. ￼￼￼￼ B. time sampling. C. event sampling. D. checklist. ANSWER : B 2a) Which of the following can...
*December 4, 2014*

**Child Development**

2) C 4) D 8) A 9) C 10) A 11) D
*December 4, 2014*

**Child Development**

10) A?
*December 4, 2014*

**Child Development**

1) B 2) D 3) A 4) B 5) A 6) C 7) B 8) B 9) A 10) C 11) A 12) B
*December 4, 2014*

**Child Development**

Possibly
*December 4, 2014*

**Child Development **

1) The recording method that's most useful in discovering the causes or results of a child's behavior is A. rating scale. ￼B. time sampling. C. event sampling. D. checklist. 2) One way a teacher can help a child stand up for her rights is A. making other ...
*December 4, 2014*

**Chemistry**

A 100.0 mL sample of a 0.200 molar aqueous solution of K2CrO4 was added to 100.0 mL of a 0.100 molar aqueous solution of BaCl2. The mixture was stirred and the precipitate was collected, dried carefully, and weighed. How many grams of precipitate should be obtained? The ...
*December 1, 2014*

**Calc**

Three students have ordered a 14 inch diameter pizza. They slice it with 2 parallel cuts, giving them 3 pieces with equal area. The two cuts are equidistant from the center of the pizza. Find the horizontal distance between one cut and the center of the pizza. I figured the ...
*November 23, 2014*

**chem**

How many mL of a 0.123 M aqueous solution of aluminum bromide, AlBr3, must be taken to obtain 7.77 grams of the salt?
*November 18, 2014*

**college algebra**

Suppose that the Russian population is declining by 0.48% each year, and continues to decline at this rate every year. a.) what is the overall 'growth' factor (really a decline factor) for 40 years of population decline? As a percentage of the current population, what ...
*November 17, 2014*

**math- bc calc**

a building is 36 ft tall. A pulley is attached to the top of the building. A rope is looped through the pulley. One end of the rope is attached to the lantern that hangs vertically parallel to the side of the building. The rope passes up vertically from the lantern, through ...
*October 29, 2014*

**math**

A college student is looking at her monthly checking account records. On September 1, 2008, her checking account held a balance of $1,050. At the end of March 2009, her checking account held a balance of $800. What is the monthly rate of change for the student’s checking ...
*October 23, 2014*

**Salford **

How to prepare 500ml of 7% Question 6 You need to make 500mls of a 7% bovine serum albumin solution. What mass, in grams, do you need to add? Perform the calculation then type in the correct answer to 1dp. Do not add units or additional spaces. 10 points
*October 19, 2014*

**Physical Science**

A box has a mass of 90 kg If the box is accelerating upward at 1.0m/s2, what is the tension of the cable?
*October 14, 2014*

**com 200**

All of the following are true of what typically occurs when first meeting someone EXCEPT:
*October 7, 2014*

**Physics**

A plane with a velocity of 111. 9 meters per second at a maximum rate of 6.8 m/s^2 the plane touches the runaway what's the minimum time before it can come to rest? A=6.8m/s^2 V=111.9m/s t=?
*September 28, 2014*

**Math Homework**

183.79
*September 28, 2014*

**Chemistry**

If you dilute 14.0mL of the stock solution to a final volume of 0.350L , what will be the concentration of the diluted solution? Before it, there was a question: How many milliliters of a stock solution of 5.60 M HNO3 would you have to use to prepare 0.190L of 0.450 M HNO3? ...
*September 27, 2014*

**Chemistry**

A professor orders 250 mL of house coffee at precisely 95°C. She then adds enough milk at 10°C to drop the temperature of the coffee to exactly 90° C. Calculate the amount of milk (in mL) the professor must add to reach this temperature. Assume that the coffee and ...
*September 23, 2014*

**physics**

A motorcycle daredevil is attempting to jump across as many buses as possible (see the drawing). The takeoff ramp makes an angle θ = 16.8° above the horizontal, and the landing ramp is identical to the takeoff ramp. The buses are parked side by side, and each bus is 2...
*September 21, 2014*

**philosopy**

Milton Friedman observes that if the same argument that advocates of corporate social responsibility say should be brought to corporate shareholders is instead brought before union members, the logical bankruptcy of the argument would be clearly evident because?
*September 17, 2014*

**Physics**

Bill throws a tennis ball vertically upward such that it leaves his hand with a speed of 12 m/s. Bill catches the ball at the same height from which he released it. Assume that air resistance is negligible, so the tennis ball can be considered to be in free-fall, with an ...
*September 12, 2014*

**Chemistry**

The level of water in a rectangular swimming pool needs to be lowered 4.00 inches. If the pool is 36.50 ft long and 15.00 ft wide, and the water is siphoned out at a rate of 5.0 gal/min, how long will the siphoning take? 1 ft^3 = 7.48 gal.
*August 28, 2014*

**physics**

A swimmer heads directly across a river, swimming at 1.5 m/s relative to the water. She arrives at a point 30 m downstream from the point directly across the river, which is 87 m wide. (c) In what direction should the swimmer head so as to arrive at the point directly opposite...
*August 9, 2014*

**physics**

AH! Sorry, I didn't know it would make the site look messy. I've been working on these for a while now,and I promise I just a lot of work into them. i didn't realize I had posted so many. Sorry.
*August 9, 2014*

**physics**

Two boat landings are 8.0 km apart on the same bank of a stream that flows at 2.8 km/h. A motorboat makes the round trip between the two landings in 50 minutes. What is the speed of the boat relative to the water?
*August 9, 2014*

**physics**

Ball A is dropped from the top of a building of height h at the same instant that ball B is thrown vertically upward from the ground. When the balls collide, they are moving in opposite directions, and the speed of A is twice the speed of B. At what height does the collision ...
*August 9, 2014*

**physics**

You have designed a rocket to be used to sample the local atmosphere for pollution. It is fired vertically with a constant upward acceleration of 17 m/s2. After 20 s, the engine shuts off and the rocket continues rising (in freefall) for a while. (Neglect any effects due to ...
*August 9, 2014*

**physics**

You have designed a rocket to be used to sample the local atmosphere for pollution. It is fired vertically with a constant upward acceleration of 17 m/s2. After 20 s, the engine shuts off and the rocket continues rising (in freefall) for a while. (Neglect any effects due to ...
*August 9, 2014*

**physics**

A swimmer heads directly across a river, swimming at 1.5 m/s relative to the water. She arrives at a point 30 m downstream from the point directly across the river, which is 87 m wide.
*August 9, 2014*

**physics**

You are riding in a boat whose speed relative to the water is 7.4 m/s. The boat points at an angle of 24.8° upstream on a river flowing at 15.2 m/s. Find the time it takes for the boat to reach the opposite shore if the river is 26.1 m wide.
*August 9, 2014*

**American History**

11. Which of the following is true of the Supreme Court's decision in Brown v. Board of Education of Topeka? A. It ruled that desegregation was a state issue, but that segregation was a federal issue. B. It established that all citizens should have access to public ...
*July 25, 2014*

**algebra**

Please help me solve this: If an object is projected upward with an initial velocity of 112 feet per second from a height h of 128 feet, then its height t seconds after it is projected is defined by the equation h=-16t^2 + 112t + 128. How many seconds after it is projected ...
*July 14, 2014*

**trig**

At a horizontal distance of 101 meters from the base of a tower, the angle of elevation to the top is 15 degrees. Find the line of sight distance to the nearest meter.
*May 28, 2014*

**math**

A 1.6 km road rises 400 m. What is the angle of elevation of the road to the nearest degree?
*May 28, 2014*

**math problem**

In DABC, what could the 7 shown in the ratio sin A = 7/9 represent? A) the length of the adjacent side of angle B B) the length of the opposite side of angle A C) the length of the hypotenuse of a right triangle D) the length of the adjacent side of angle A I did this as an ...
*May 27, 2014*

**math**

thank you
*May 27, 2014*

**math**

A ladder is leaning against the side of a house and forms an angle of 66o with the ground. The foot of the ladder is 11.3 feet from the base of the house. Find the length of the ladder to the nearest foot.
*May 27, 2014*

**trig**

thank you, I was confused
*May 27, 2014*

**trig**

A road has a 10% grade (slope). To the nearest degree what is the angle of elevation of the road? should I use sin?
*May 27, 2014*

**trig**

A 15 ft. ladder makes a 35o angle with the side of a house. To the nearest tenth of a foot how high up on the house does the ladder come?
*May 27, 2014*

**math**

The Washington Monument is 169 meters high. Find the angle of elevation to the nearest degree to the top of the monumenmt from a point .5 km from the base.
*May 25, 2014*

**need help1 what function to use? math**

thank you
*May 25, 2014*

**need help1 what function to use? math**

An airplane approaches a runway at a 3 degree angle of depresssion. If the plane is flying at 30,000 ft., find the ground distance from the airport to the point directly below the plane when the pilot begins the descent. Round your answer to the nearest foot.
*May 25, 2014*

**trig**

Robert is standing on a cliff and looks down at an angle of depression of 62 degrees to look at a boat. The cliff is 76 feet high. How far is the boat from the cliff? Round your answer to two decimal places. The boat is _________ feet from the cliff.
*May 24, 2014*

**geometry**

thanks. steve
*May 22, 2014*

**geometry**

Part of a road that is 452 meters in length has a slight incline. The vertical rise is 12 meters. Find the angle of elevation. can anybody help? and it must be rounded to the nearest tenth
*May 22, 2014*

**math**

To secure a 500 meter radio tower against high winds, guy wires are attached to a ring that is 5 meters from the top of the tower. The wires form a 15 degree angle with the tower. Find the distance from the base of the tower to the guy wire anchor in the ground. Round your ...
*May 22, 2014*

**Statistics **

The Jefferson valley bank claims that the variation of their wait time is less when using a single line that feeds three tellers as opposed to having threes peerage lines. Test the claim that the standard deviation for wait time is less than 1.9 minutes with a single feed line...
*May 7, 2014*

**pre calculus**

4+7i divided by 2 (problem is written as a fraction) 4+7i _________ 2
*May 1, 2014*

**pre calculus**

Express statement as an equation. Use the given information to find the constant proportionality z varies inversely as t. If t 3, then z 5.
*May 1, 2014*

**pre cal**

An airplane is flying at a speed of 350 mi/h at an altitude of one mile. The plane passes directly above a radar station at time t 0. (a) Express the distance s (in miles) between the plane and the radar station as a function of the horizontal distance d (in miles) that ...
*May 1, 2014*

**pre calculus**

You have a $50 coupon from the manufacturer good for the purchase of a cell phone. The store where you are purchasing your cell phone is offering a 20% discount on all cell phones. Let x represent the regular price of the cell phone. (a) Suppose only the 20% discount applies. ...
*May 1, 2014*

**algebra 2/trig**

Tina can paint a room in 8 hours, but when she and her friend Emily work together, they can complete the job in 3 hours. How long would it take Emily to paint the room alone?
*April 9, 2014*

**pre calculus**

determine whether the equation defines y as a function of x. √x + y = 12
*April 8, 2014*

**pre calculus**

A taxi company charges $2.00 for the first mile (or part of a mile) and 20 cents for each succeeding tenth of a mile (or part). Express the cost C (in dollars) of a ride as a piecewise-defined function of the distance x traveled (in miles) for 0 < x < 2
*March 27, 2014*

**Biology**

Read the DNA sequence given below in the 3' to 5' direction and please tell me all of the potential start codons (i.e. every time you see the DNA version of a start codon, even if it does not immediately come after a promoter). 3'-...
*March 22, 2014*

**Biology**

What 3' to 5' DNA sequence would correspond to a 5'-AUG-3' start codon?
*March 22, 2014*

**Biology**

(This question ties into the previous question I posted about mRNA). Use the Universal triplet code to determine the sequence of amino acids that would be generated for each of the mRNA sequences that you generated in question 2. Remember that the reading of mRNA goes in the 5...
*March 22, 2014*

**Biology**

Does it matter which strand is the 'code strand'? The following two sequences look identical, except one runs 3'-5' and the other 5'-3'. For each DNA sequence given below, write the mRNA sequence that would be coded from it. Make sure you indicate the ...
*March 22, 2014*

**Biology**

For the DNA sequence given below, write the complementary DNA sequence that would compliment the double-strand DNA 3'--ATTGCTTACTTGCATGGTACCTCTAGCGTTTAGGC--5'
*March 22, 2014*

**Pre-Calc**

3x+4y
*March 4, 2014*

**Pre-Calc**

why is the line <x,y,z>=<8,9,10>+t<3,4,5> perpendicular to the plane 3x=4y+5z=10
*March 4, 2014*

**chemistry 2**

You are instructed to create 800. mL of a 0.69 M phosphate buffer with a pH of 7.6. You have phosphoric acid and the sodium salts NaH2PO4, Na2HPO4, and Na3PO4 available. what is the molarity needed for the acid component of the buffer?What is the molarity needed for the base ...
*March 4, 2014*

**pre calculus**

Candy and Tim share a paper route. It takes Candy 70 min to deliver all the papers, and it takes Tim 80 min. How long does it take the two when they work together?
*March 4, 2014*

**pre calculus**

Jack invests $1000 at a certain annual interest rate, and he invests another $2000 at an annual rate that is one-half percent higher. If he receives a total of $190 interest in 1 year, at what rate is the $1000 invested?
*March 4, 2014*

**pre calculus**

solve nonlinear inequality x^4 > x^2
*March 3, 2014*

**Chemistry**

If a 0.192 g sample of copper metal reacts with elemental sulfur to form 0.240 g of the sulfide product, (a) find the percent by mass of copper and sulfur in the product and (b) find the empirical formula of the copper sulfide
*February 24, 2014*

**Physics**

Determine the displacement of a plane that experiences uniform acceleration from 77 m/s to 110 m/s in 16 seconds.
*February 22, 2014*

**Math (pre calculus)**

ax+b/cx+d=2 solve for x
*February 20, 2014*

**calculus**

ax+b/cx+d=2 solve for x
*February 20, 2014*

**pre cal**

a+1 a-1 B+1 _________ = _______ + _________ B B a Solve for A. Note: I set up problems with underlines so they can look like fractions. That's what they are.
*February 20, 2014*

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