Monday
September 1, 2014

Posts by danielle


Total # Posts: 709

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

Math
Every moment of every day, light pours out from the Sun at the center of our solar system and travels to Earth. It does not arrive at Earth instantaneously though; it takes time to get here. Your task is to figure out how long it takes for light to travel from the Sun to Earth...
February 18, 2014

AP Chemistry- Equilibrium
If 10.0 mL of 0.18 M MgCl2 are mixed with 20.1 mL of 0.56 M NaOH, what will be the final concentration of Mg2+ in solution when equilibrium is established? Assume the volumes are additive. Ksp = 1.2 ✕ 10-11 for Mg(OH)2.
February 9, 2014

AP Chemistry- Equilibrium
If 10.0 mL of 0.18 M MgCl2 are mixed with 20.1 mL of 0.56 M NaOH, what will be the final concentration of Mg2+ in solution when equilibrium is established? Assume the volumes are additive. Ksp = 1.2 ✕ 10-11 for Mg(OH)2.
February 9, 2014

chemistry
What [Ag1+] is required to start precipitation of AgOH from a saturated solution of Mg(OH)2? Ksp = 2.4 ✕ 10-8 for AgOH and Ksp = 2.6 ✕ 10-11 for Mg(OH)2
February 9, 2014

Math (pre calculus)
please simplify (1/1+x+h) - (1 /1+x ) divided by h
February 6, 2014

pre calculus
Correction: the question is to simplify the FRACTIONAL expression.
February 6, 2014

pre calculus
Simplify the rational expression 3 (1 + x)^1/3 - x (1 + x)^-2/3 divided by (1 + x)^2/3
February 6, 2014

Math (pre calculus)
State whether the given equation is true for all values of the variables (disregard any value that makes a denominator zero) equation one (2/ 4 + x) = (1/2) + (2/x) equation two (1 + x + x^2 / x) = (1/x) + 1 + x
February 6, 2014

Math (pre calculus)
Solve 2^3-x = 5^2x+1 Give an exact solution.
December 12, 2013

Math (pre calculus)
The population of a certain town grows from 10,000 in 1982 to 35,000 in 1995. At this rate, in what year will the population reach 300,000? Tip* Population growth formula: P = P(subzero)multiplied by e^(k)(t)
December 12, 2013

Pre algebra
Vernon drew an 8in. Wide by 5in.tall picture that will be turned into a 48 ft wide billboard.How tall will the actual billboard be?
November 19, 2013

Chemistry, Science
How many Cl- ions are present in 2.35 mol of CaCl2 and please show steps ! Need help so I can study for a huge test tomorrow
November 14, 2013

statistics
In the following problem, check that it is appropriate to use the normal approximation to the binomial. Then use the normal distribution to estimate the requested probabilities. More than a decade ago, high levels of lead in the blood put 89% of children at risk. A concerted ...
November 14, 2013

Algebra 2 H
No, its not suppose to have a denominatory
November 9, 2013

Algebra 2 H
well no its a parabola. so there are no discontinuius? How would I find the x-values if they are not.
November 9, 2013

Algebra 2 H
Find x-values if any at which the function f(x)=13x^2-15x-15 is not continuous. Which of the discontinuities are removable? THANKS YOU!!
November 9, 2013

math
. Cimarron Homes Inc. purchased a snow plow for $57,000 and financed the full amount for 5 years at an annual simple interest rate of 9%. a. Find the interest due on the loan. b. Find the monthly payment
November 7, 2013

calculus HELP!
A person stands on a bridge that is 100 feet above a river. If she drops a pebble how fast is it moving after 2 seconds? How long does it take the pebble to reach the river below? She has another pebble that she tosses up with initial speed of 8 feet per second. It goes up, ...
November 6, 2013

Math
I understand what you did but which one would i round it to the 20 speeches or 21 speeches?
October 7, 2013

Math
A speaker has a collection of 62 jokes. He uses 3 jokes in each speech. Please help i got a is 37820 but really need help with part b (a) In how many ways can he select 3 jokes for a speech? How many speeches can he give without using a joke twice? (Round your answer down to ...
October 7, 2013

Math
A sociology seminar has 7 members (a) They begin each meeting with each member shaking hands with all the other members. No one shakes another member's hand twice. How many handshakes take place? (b)The professor shakes hands with each member of the seminar and in a ...
October 6, 2013

4th grade math
62 < ( 62+ 14 )
October 1, 2013

Chemistry
Calculate the molarity of a solution prepared by dissolving 16 g of urea, NH2CONH2, in 39 g of H2O. The density of the solution is 1.3 g/mL. I've tried this question so many times but I keep getting it wrong please help me
September 29, 2013

science
would the order be Algae, small fish, large fish, sea lion, and shark
September 25, 2013

science
Hello, I need help with 2 food chain orders the first one is : plants, hawk, toad, grasshopper and snake. Would the order for that be plants, grasshopper, snake, hawk, and toad. Second food chain is algae, shark, small fish, sea lion, large fish. Would that order be algae, ...
September 25, 2013

science
how to make a problem about butterfly, using the scintific method
June 24, 2013

english
how does the woman have the power to ruin men in the book of the great gatsby and the crucible?
June 4, 2013

english
i have to write about the crucible and the great gatsby all in one essay
June 4, 2013

english
what grabber can i make for the essay I'm making for the book the great gatsby?
June 4, 2013

english
what can i make my grabber for an essay I'm doing on the great gatsby?
June 4, 2013

Geometry
The surface area of a cone is 16.8pi in squared. The radius 3 in. What is the slant height?
May 6, 2013

Geometry
One right circular cone is set inside a larger circular cone. The cones share the same Axis, the same vertex, and the same height. Find the volume of the space between the cones of the diameter of the inside cone is 6in., the diameter of the outside cone is 9in and the height ...
May 6, 2013

Chemistry
A current of 2.34 A is delivered to an electrolytic cell for 85 minutes. How many grams of Au will be deposited from an aqueous solution of AuCl3?
April 28, 2013

Chemistry
A current of 2.34 A is delivered to an electrolytic cell for 85 minutes. How many grams of Au will be deposited from an aqueous solution of AuCl3?
April 28, 2013

math hw (algebra)
On the sidewalk the distance from the dormitory to the cafeteria is 400 meters. By cutting across the lawn, the walking distance is shortened to 300 meters. how long is each part of the L shaped sidewalk?
April 25, 2013

math (algebra)
An auto dealer wants to string a wire from the top of a pole to the ground and hang colorful pennants from it. The distance from the base of the pole to the point where the wire is attached to the ground is 3 times the height of the pole. If the wire is 63 feet long, how tall ...
April 25, 2013

chemistry
what will be the internal pressure causes by hydrogen gas when 5.00 g of zinc is dissolved in 50 g of concentrated hydrochloric acid if the volume of the container is 250 mL and the container is allowed to cool 20 degrees celcius
April 21, 2013

Math
The value of a computer bought in 1998 decreases as time passes. Two years after the computer was bought, it was worth $2,600. Five years after it was bought, it was worth $2,000. If the relationship between number of years past 1998 and value of the computer is linear, write ...
April 18, 2013

Algebra
The value of a computer bought in 1998 decreases as time passes. Two years after the computer was bought, it was worth $2,600. Five years after it was bought, it was worth $2,000. If the relationship between number of years past 1998 and value of the computer is linear, write ...
April 18, 2013

algebra graphing
according to some students, what is the true purpose of homework?
April 9, 2013

Algebra
The length of a rectangular flag is four yards longer than the width. The area f the flag is 140 square yards. Find the length and the width.
April 7, 2013

Physics - Electric Potential
A charge of - 0.15 C is moved from a position where the electric potential is 13 V to a position where the electric potential is 60 V. What is the change in potential energy of the charge associated with this change in position?
April 1, 2013

math
C.3.75x + 7x; $10.75
March 26, 2013

algebra
A model car is constructed with a scale of 1 : 15. If the actual car is 12 feet long, which proportion represents the length x of the model car?
March 26, 2013

geometry
the perimeter of parallelogram QRST is 26cm. If ST=e 6cm what is the length of RS
March 17, 2013

physics
P1/T1 = P2/T2 P1 = 3.0 ATM T1 = 20+273 = 293K P2 = ? T2 = -33+273=240 3.0/293 = P2/240 P2 =(3.0/293)*240 P2 = 2.457337 = 2.46 ATM
March 8, 2013

trig
a lighthouse is located at point A. a ship travels from point B to point C. At point B,, the distance between the ship and the lighthouse is 7.5km. At point C the distance between the ship and the lighthouse is 8.6km. Angle BAC is 58 degrees. Determine the distance between B ...
February 14, 2013

Math
I need to figure this equation out and I do not understand what the backwards E means ODR= # of people aged ∃65 --------------------- x 100 # of people aged 15-64
February 6, 2013

Math
Use the method of elimination to solve the following system of equations. You must check your answer: 1)x/2 + y/5 = 1/2 2) 3x - y = -8
January 19, 2013

Math
Translate this situation into a system of equations of the first degree in two variables and make sure you identify the variables clearly: Today, the difference in age between a father and his son is 23 years. Two years from now, the father's age will be double the age of ...
January 17, 2013

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