Sunday
September 25, 2016

Posts by EMILY

Total # Posts: 2,815

was not in class bio/ math
Preparing a Solution: A. Calculate the amount of methylene blue chloride (MW = 319.8 g/mol) needed to make 50 ml of a 10 mM stock solution. (Show calculations below) B. If you wanted to then dilute the solution from Part A to a final concentration of 0.1mM (in 50 ml total ...
September 20, 2016

math
translate the following sentence into an equation: The product of 9 and four less than n is 27 is is 9(n-4)=27 or 9n-4 = 27
September 13, 2016

Chemistry
Do you think the copper and zinc underwent a physical change or a chemical change?
September 7, 2016

Algebra 1
you have $50 in your bank account and you deposit $20 per week. Write an equation for the total amount of money you have in your account after x weeks.
September 7, 2016

Math
CLIMATOLOGIST Each year a tree is alive,it adds a layer of growth,called a tree ring,between its core and its bark. A climatologist measures the width of tree rings of a particular tree for different years: YEAR: 1900:1910:1920:1930:1940 Width of ring:14/25:29/50:53/100:13/20:...
September 6, 2016

Texas History
Both answers is wrong it's C if you want to be correct just pick it it will be right becauseI chose D and it said it was wrong as well with A and B.
August 26, 2016

English
Revise the following sentence so that ACTIONS name KEY VERBS. 1. Our discussion was lively and fun
August 25, 2016

Health
Which of the answer is correct
August 18, 2016

chemistry
A major component of gasoline is octane C8H18. When octane is burned in air, it chemically reacts with oxygen gas O2 to produce carbon dioxide CO2 and water H2O. What mass of octane is consumed by the reaction of 8.8g of oxygen gas? Round your answer to 2 significant digits.
August 9, 2016

Math
composite number: positive integer that isn't a prime number Less than 10 + greater than 6 + even: 8 - Factors: 1,2,4,8 -- composite Answer:8
August 3, 2016

calc
a parallelogram has an area of 150 cm^2. the side lengths are 80 cm and 40 cm what are the measures of the angles
July 15, 2016

calculus
A door is opened by pushing inward explain in terms of torque why this is most easily accomplished when pushing at right angles to the door as far as possible from the hinge side of the door?
July 15, 2016

calc
a wrench is rotated with torque of magnitude 175 N (M). the force is applied 45 cm from the pivot point at an angle of 48 degrees. what is the magnitude of the force, to one decimal place?
July 15, 2016

calc
Would k(a-b) x (a x c) -a +( b x c) be a scaler, vector or meaningless? (these are all vectors besides k)?
July 15, 2016

Math
Thank yoU!
July 14, 2016

Math
Mr.Adams had a coin collection including only nickels, dimes, and quarters He had twice as many dimes as nickels and half as many quarters as he had nickels. If the total face value of his collection was $300.00, how many quarters did the collection contain? A) 75 B) 100 C) ...
July 14, 2016

Calc.
Determine the value and value for each of the following: a) 2(3,y )-5(x,2)= (6,-4 )
July 8, 2016

Calc.
Find the angle between the vectors ⃗⃗u (-1,4,2 ) and ⃗v (-2,5,1 )
July 8, 2016

Sciencr
Why is a cool basement damp, in terms of humidity? I know that when you increase temperature and relative humidity decreases but I don't get how this fits? It's a closed environment so maybe there is condensation?
July 2, 2016

algebra
Yes it can be whatever you want between that given range. For example, if the slope was -0.2, (or -1/5) then, your line would go down from left to right (because it's negative) and move down 1 every time you move 5 to the right (m= rise/run) Hope that helps!
June 13, 2016

Math
Marie traveled to work (7km) in 25 minutes. What was her speed? I got 16.8km/h but my teacher said it's 28km/h and I have no idea how he got that. Also, how do you calculate average speed when there's more than one speed? (this is just for the next question)
June 13, 2016

math
First, I would put all the times to one unit. (I'm going to use minutes because I don't like working with decimals.) 1 hour: 60 minutes 1 day: 60 minutes times 24 (hours in a day) = 1440 minutes Now set up proportions: 150 people/1 minute = x people/60 minutes cross ...
June 13, 2016

algebra
a math exam is marked out of 120. draw a conversion graph to change the following marks to percentages. a_80 b_110 c_54 d_72
June 6, 2016

algebra
long-distance calls from New York to Harare are priced at 85 cents/min off peak and $1.20/min at peak times. a_ draw, on the same exes, conversion graphs for the two different rates. b_ from your graph estimate the cost of an 8 minute call made off peak. c_ estimate the cost ...
June 6, 2016

algebra
long-distance calls from new york to harare are priced at 85 cents/min off peak and $1.20/min at peak times. a_ draw, on the same axes conversion graphs for the two different rates. b_ from your graph estimate the cost of an 8 minute call made off peak. c_ estimate the cost of...
June 6, 2016

Calculus
I should probably specify that I got the area by integrating y^(-1/2) - (-y^(-1/2)) with my calculator on the interval [1,3] Sorry!
May 24, 2016

Calculus
Find the area of the region bounded by the curves y = x^(-1/2), y = x^(–2), y = 1, and y = 3. a) (1/2)(3)^1/2 + (4/3) b) 2*(3)^1/2 - (8/3) c) (1/2)(3)^1/2 - (32/3) d) 2*(3)^1/2 - (32/3) e) (8/3) - 2*(3)^1/2 So one thing that is throwing me off on this question is that I ...
May 24, 2016

trigonometry
Verify that sec(θ)/csc(θ)-cot(θ) - sec(θ)/csc(θ)-cot(θ) = 2csc(θ) is an identity. can some help me through this? thank you!
May 24, 2016

trigonometry
25. simplify: sin^2 ø/1- cos ø please help? thank you!
May 20, 2016

math
i don't have any work to show you... i don't get it
May 15, 2016

math
You want to cover a trapezoidal box with paper. You have a sheet of paper that is 1m by 500cm. What is the size box that can be made with minimal wastage? plz plz plz help me with this.. i don't understand how to do this
May 15, 2016

Algebra
You want to cover a trapezoidal box with paper. You have a sheet of paper that is 1m by 500cm. What is the size box that can be made with minimal wastage?
May 15, 2016

Maths
the total answer will be 437 +248 6 8 5
May 15, 2016

Maths
437 +248 do the math...
May 15, 2016

Maths
okay, and does the 4 at the bottom go under 3 and the 8 go under 7?
May 15, 2016

Maths
Does the 2 go under 4 or 3?
May 15, 2016

math
9. solve |4x + 3| = 9 + 2x and check for extraneous solutions. the first answer I got was: |4x +3| = 9 + 2x |4x| = 6 + 2x 2x = 6 x = 3 can someone help me find the other answer? thank you!
May 12, 2016

math
8. The half-life of a certain radioactive material is 71 hours. An initial amount of the material has a mass of 722 kg. Write an exponential function that models the decay of this material. Find how much radioactive material remains after 17 hours. Round your answer to the ...
May 11, 2016

math
6. The half-life of a certain radioactive material is 32 days. An initial amount of the material has a mass of 361 kg. Write an exponential function that models the decay of this material. Find how much radioactive material remains after 5 days. Round your answer to the ...
May 11, 2016

Math
A tank measures 30 can by 60cm by 50cm. What is the height of water in the tank when 60000 ml of water are poured into it?
May 10, 2016

math
O MY GOODNESS I UNDERSTAND NOW THANK YOU SO MUCH
May 10, 2016

math
14. Let f(x) = -­2x ­- 7 and g(x) = ­-4x + 3. Find (f o g)(-­5) A)23 B)-53 C)-9 D)3 please help!!
May 10, 2016

math
17. Let f(x) = x2 + 6 and g(x) = x+8/x . Find ( g o f)(­ -7) A)384/7 B)295/49 C)-57/7 D)63/55 could someone please help?
May 10, 2016

math
18. For the function f(x) = x2 ­ -12, find (f o f­-1)(4). A)4 B)10 C)6 D)0 help please?
May 10, 2016

Math
Yesterday kate and her cousin robert went out for a movie there they spent $50 in total robert spent $10 more than kate how much did kate spend?
May 9, 2016

Chemistry
how many grams of AlCl3 is produced if 15.5 grams of Al are reacted with excess Cl2 gas? 2Al + 3Cl2 > 2AlCl3
May 9, 2016

math
sorry, I meant A or B, because I am "sure" that there is a remainder from looking at the equation. I just needed someone to help go through the equation.
May 6, 2016

math
Divide -3x^3 - 2x^2 - x - 2 by x – 2. A. -3x2 - 8x - 17, R –36 B. -3x2 + 4x + 15, R 32 C. -3x2 + 4x + 15 D. -3x2 - 8x - 17 I'm sure it's either B or C, can someone help?
May 6, 2016

math
Is the relation a function? 4 -> 8 7 -> 11 10 -> 14 12 -> 10 A. yes B. no
May 4, 2016

Geometric Sequence
The colour of some clothing fades overtime when washed. Suppose a pair of jeansfades by 5% with each washing. To the nearest wash, how many washes would it take so that only 25% of the original colour remains in the jeans? 1. first term = 2. r = 3. tn = 4. n = I know that tn ...
May 4, 2016

math
The distance between town A and town B was 210 km. At 9:20 pm, a bus set off from town A to town B and a car from town B to town A. The average speed of the bus was 60 km/h, and the average speed of the car was 80 km/h. a) Calculate the time at which the car passed the bus. b...
April 28, 2016

math
Ava made 100 paper cranes, and Brittany made 3/4 of paper cranes Ava made. Ava gave 9/20 of her paper cranes to Brittany. Then, Brittany gave 1/4 of her paper cranes to Ava. How many more cranes did Brittany have than Ava in the end?
April 28, 2016

Physics
a cube slides down a frictionless incline as shown and inelastically strikes a cube at the battom of the incline that's 1/2 (one-half) it's mass. The coeff. of restitution between the two masses is 0.7. If incline is 30 cm high and table is 90cm off floor, at what ...
April 27, 2016

physics
a cube slides down a frictionless incline as shown and inelastically strikes a cube at the battom of the incline that's 1/2 (one-half) it's mass. The coeff. of restitution between the two masses is 0.7. If incline is 30 cm high and table is 90cm off floor, at what ...
April 26, 2016

Math
A person plans to invest a total of $9000 in an account that pays 3% annual interest and another account which pays 8% annual interest. How much should be invested in each account so that the total interest for one year will be $580.
April 25, 2016

math
the power (P) generated in a electrical circuit is proportional to the square of the current ( L amps) . when the power is 108, the current is 6 amps. a_ write down the relationship between P,L and the constant of variation k . b_ calculate the value of k c_ calculate the ...
April 24, 2016

math
the length ( L cm) of an edge of a cube is proportional to the cube root of its mass ( M grams).It is known that if L= 15, then M=125. let K be the constant of variation. CALCULATE THE VALUE OF K
April 23, 2016

Physics
Blood flows in an aorta of radius 4.62mm at 35.0cm/s. Calculate the volume flow rate. Although the cross-sectional area of a capillary is much smaller than that of the aorta, there are many capillaries, so their total cross-sectional area is much larger. If all the blood from ...
April 22, 2016

Physics
Thank you!
April 22, 2016

Physics
I keep getting .154
April 22, 2016

Physics
Thank you so much! And What distance, d, from the edge of the table does the block hit the floor?
April 22, 2016

Physics
A 0.294-kg box is placed in contact with a spring of stiffness 3.792×102 N/m. The spring is compressed 1.42×10-1 m from its unstrained length. The spring is then released, the block slides across a frictionless tabletop, and it flies through the air. The tabletop ...
April 22, 2016

Chemistry
The pH of human blood needs to be between 7.35 and 7.45. You want to prepare a buffer solution that gives a pH of 7.40. You decide to use a sodium phosphate buffer: the acid is H2PO− 4 and the conjugate base is HPO2− 4 . You want the concentration of the acid to be...
April 22, 2016

Math
Thank you£¡
April 22, 2016

Math
I don¡¯t know how to slove this problem can someone help me£¿ The shorter leg of a 30¡ã60¡ã90¡ãtriangle is 2.5 feet long.Find the perimeter.
April 22, 2016

Physics
Consider a metal rod that is 1.42 m in length at a temperature of 14.4°C. The coefficient of linear expansion is 5.22×10-5°C-1. What is the change in length of the rod as temperature increases from 14.4°C to 52.0°C.
April 21, 2016

Language arts
1.C 2.D 3.A 4.D
April 20, 2016

Physics
The volume flow rate in an artery supplying the brain is 4.59E-6 m3/s. If the radius of the artery is 5.33 mm, determine the average blood speed.
April 20, 2016

Physics
A block of mass M=0.525kg is floating stationary in a beaker of water. A string connected to the bottom of the beaker holds the block in place. The tension in the string is 7.10 N. The bottom of the block is floating a distance h=1.66cm above the bottom of the beaker. What is ...
April 20, 2016

Chemistry
I'm sorry the full question was: 1. If the initial H2PO− 4 concentration is 0.0100 M, what is the initial concentration of HPO2− 4 that will give a pH of 7.40? 2. What is the maximum molarity of acid that this buffer can neutralize without the pH dropping below...
April 19, 2016

Chemistry
The pH of human blood needs to be between 7.35 and 7.45. You want to prepare a buffer solution that gives a pH of 7.40. You decide to use a sodium phosphate buffer: the acid is H2PO−4 and the conjugate base is HPO2− 4. You want the concentration of the acid to be 0...
April 19, 2016

Math
A high school has 438 students with about the same number of males and females. Describe a simulation to predict how many of the first 50 students who leave school at the end of the day are female.
April 19, 2016

Math
Talia tossed a penny many times. she got 40 heads and 60 tails. she said the experimental probability of getting heads was 40 over 60. Explain and correct her error.
April 19, 2016

math
Shoot. I meant to say how to write this equation in standard form: y=(x+1)(x-1)(x-1)
April 18, 2016

Precalculus
A population of bacteria has exponential growth and will double after 10 hours. Find the growth rate to the nearest hundredth.
April 13, 2016

Physics
A spring loaded ballistic pendulum gun requires an increasing force to load. When loading a ball of mass 0.054 kg, the spring is compressed 7.00 cm, the gun is fully loaded, and the force required is 70.0 N. a) Calculate the work required to load the gun. b) Calculate the ...
April 12, 2016

Physics
A pendulum clock can be approximated as a simple pendulum of length 1.03 m and keeps accurate time at a location where g = 9.82 m/s2. In a location where g = 9.77 m/s2, what must be the new length of the pendulum, such that the clock continues to keep accurate time (that is, ...
April 12, 2016

Stats
{Exercise 7.11} The following data are from a simple random sample. 3, 8, 11, 6, 11, 15 What is the point estimate of the population mean? 9 What is the point estimate of the population standard deviation (to 1 decimal)?
April 8, 2016

Geometry
a jewlery box in the shape of a rectangle prism has a volume of 90in.3 and a height of 2 1/2 in, What are possible demensions for the length and width of base
April 6, 2016

Physics
A horizontal circular platform (m = 110.1 kg, r = 3.21m) rotates about a frictionless vertical axle. A student (m = 98.3kg) walks slowly from the rim of the platform toward the center. The angular velocity, omega, of the system is 3.9 rad/s when the student is at the rim. Find...
April 6, 2016

chemistry
If 5.40 kcal of heat is added to 1.00 kg of water at 100⁰C, how much steam at 100⁰C is produced? Show all calculations leading to an answer. Please help?
April 6, 2016

chemistry
You have two sealed jars of water at the same temperature. In the first jar there is a large amount of water. In the second jar there is a small amount of water. Using 3 -4 sentences explain how the vapor pressure of water in the first jar compares with the vapor pressure of ...
April 6, 2016

Math
Which hand has covered more distance from the 12 on a clock, the minute hand at 4:00 or the second hand at 15 seconds past? Write a fraction inequality to support your answer.
April 5, 2016

Trig
Find the exact values of sec(x)=7. I know that cos(x)=1/7. I know that sin(x)= sqrt(1-91/4900). I know that tan(x)=1. I know how to do the problem but I'm not really sure why, and I'd like to know. I got 4sqrt(3). Please help!
April 1, 2016

Calculus
I got the second answer. Still confused on the first one.
April 1, 2016

Calculus
Find the exact value of cot(arcsin(12/13)) and cos(arcsin(1.7/2)) I know that cos(arcsin(x))=sin(arccos(x))=sqrt(1-x^2). I'm having more difficulty with the first one. Please help! Thank you
April 1, 2016

Calculus
How do I tell the difference between a non conic function and a conic function by looking at an equation?
March 31, 2016

chemistry
A gas occupies 5.65 L at 808 torr and 17◦C. What volume will it fill if the pressure is changed to 730 torr and the temperature is raised to 51◦C?
March 30, 2016

Algebra
Find two consecutive even integers such that the square of the lesser integer increased by twice the greater integer is 364.
March 30, 2016

Physics
Just saw your reply, bobpursley. I will show you my work in a few minutes. Thank you
March 30, 2016

Physics
I got a, but can't figure out the rest of the questions. Please help! Thank you
March 30, 2016

Physics
A high-speed sander has a disk 5.70 cm in radius that rotates about its axis at a constant rate of 1120 revolutions per minute. a.) Determine the angular speed of the disk in radians per second. b.) Determine the linear speed of a point 2.40 cm from the disk's center. c.) ...
March 30, 2016

Physics
How do you turn revolutions into radians? Please help!
March 30, 2016

Physics
A wheel has a radius of 5.22 m. a.) How far (path length) does a point on the circumference travel if the wheel is rotated through an angle of 34.3°? b.) How far does a point on the circumference travel if the wheel is rotated through an angle of 34.3 rad? c.) How far does...
March 30, 2016

Physics
A pulsar is a rapidly rotating neutron star that continuously emits a beam of radio waves in a searchlight manner. Each time the pulsar makes one revolution, the rotating beam sweeps across the earth, and the earth receives a pulse of radio waves. For one particular pulsar, ...
March 29, 2016

Physics
A block of mass 0.61kg starts from rest at point A and slides down a frictionless hill of height h. At the bottom of the hill it slides across a horizontal piece of track where the coefficient of kinetic friction is 0.40. This section (from points B to C) is 4.73m in length. ...
March 29, 2016

Physics
In a skating stunt known as "crack-the-whip", a number of skaters hold hands and form a straight line. They try to skate so that the line rotates about the skater at one end, who acts as the pivot. The skater farthest out has a mass of 76.7 kg and is 6.18 m from the ...
March 29, 2016

Physics
A 9.37 kg monkey is hanging by one arm from a branch and swinging on a vertical circle. As an approximation, assume that the radial distance between the branch and the point where the monkey's mass is located to be 86.8 cm. As it swings through the lowest point on the ...
March 29, 2016

Physics
A car travels at a constant speed around a circular track whose radius is 2.59 km. The car goes once around the track in 380 s. What is the magnitude of the centripetal acceleration of the car?
March 29, 2016

Physics
Read the equation wrong, I got it. Sorry!
March 29, 2016

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