Thursday
December 8, 2016

Posts by Jessica

Total # Posts: 3,229

Science
Fossil Occurrence and the Age of Rocks: Groups of fossil organisms occur throughout the geologic record for specific intervals of time. This time interval is called the fossil’s range. Knowing the range of the fossils of specific organisms or groups of organisms can be ...
June 6, 2016

Science
Why Devonian could not be considered an index fossils? How can the occurrence of fossils and their known age ranges be used to date rocks? Need help by understanding the question.
June 6, 2016

Science
I don’t understand the question, help?
June 6, 2016

Science
How can the occurrence of fossils and their known age ranges be used to date rocks?
June 6, 2016

Math ~ CHECK ANSWER
Below are two sets of student quiz scores on a 30-point quiz. Which of the following can you conclude by comparing their box-and-whisker plots? Class A: 5, 10, 13, 18, 19, 25, 29 Class B: 1, 3, 5, 7, 9, 9, 13 a) The first quartile of class B is greater than the third quartile ...
June 2, 2016

chemistry
In a certain experiment, the rate constant, k, was measured as a function of the temperature, T.  Two data points were as follows: (A) 25°C, 1.1 x 10–5 min–1, and (B) 225°C, 2.4 x 10-2 min–1. The student who performed the experiment then ...
June 1, 2016

Chemistry
At 425°C, a reaction has a rate constant of 7.7 x 10–4 s–1 and has an activation energy of 275 kJ mol–1. What is the frequency factor? The answer is 2.9 x 1017 s–1 , I need help with working out I used arrhenius equation and rearranged ...
June 1, 2016

Geometry
Which is the equation of a 20 cm diameter circle with its center at (3, -6)? (x+3)^2+(y-6)^2=100 (x-3)^2+(y+6)^2=400 (x-3)^2+(y+6)^2=100 <my choice (x+3)^2+(y-6)^2=400
May 27, 2016

Math
Suppose f (0) = 9, f ′(0) = 2, and f ″(0) = -4. If df is used to approximate Δf when Δx = 0.01, which of the following would be true? df < Δf df > Δf df = Δf
May 26, 2016

Math
Thank you so much!
May 24, 2016

Math
A rectangle is bounded by the x-axis, the y-axis, and the line y = (4-x)/4. Find the maximum area of such a rectangle.
May 24, 2016

Math
Suppose f (x) = x^3 + x and g(x) = f^-1(x). Find g'(2). I am confused about how to find the inverse of f because I can't isolate y. Could you please help? Thanks!
May 24, 2016

physics
In a marathon race, Chad is out in front, running due north at a speed of 3.92 m/s. John is 94 m behind him, running due north at a speed of 4.33 m/s. How long does it take for John to pass Chad
May 23, 2016

math
Eufj j reh g d
May 22, 2016

Math
OK I don't know where to start 4 (2/4) × 4
May 20, 2016

Math
#1) 8/10 +1/3 = 34/30= 1 (4/30) Is my answer OK #2) 2/5 ÷1/3= 6/5 = 1 (1/5) Is my answer OK #3) 2/5 ÷ 1/3 =6/5= 1 (1/5) Is my answer correct
May 20, 2016

Math
#1) which digit is 10 times the value in the underline digit in 36,119,432 (#that is underline is number 1 between the 1 and 9 ) I think the answer is one hundred thousand #2) which digit is 1/1000 of the value in the underline digit in 19,832,456 (# underline is 3) My answer ...
May 20, 2016

Math
#1) Luis stated that when you are converting meters to centimeters your answer will be larger than your original number. My answer is yes because centimeters are smaller . (Is my answer OK ) #2) 8/9 + 1/3= 33/27= 1(12/27)= (I'm stuck here) #3) 6/8-2/6=2 (18/20) =2 (9/10) ...
May 20, 2016

math
I get 39.85
May 19, 2016

History
The political order of the 19th century, at the time combined people of many nationalities who wanted their own governments.
May 19, 2016

History
single most powerful European political ideology of the 19th and early 20th centuries political outlook, nationalism was and is based on the relatively modern concept that a nation is composed of people who are joined together by the bonds of common language as well as common ...
May 19, 2016

History
How did nationalism threaten the existing political order of the nineteenth century?
May 19, 2016

Geometry
Two similar triangles have a scale factor of 3 : 5. The altitude of the larger triangle is 24 inches. What is the altitude of the smaller triangle?
May 16, 2016

Physics
A model rocket is launced from the ground with an initial velocity of 65 m/s directly upwards. If a horizontal wind is blowing at 5 m/s during the flight, how far from the launch point will the rocket land? I know I should probably be using the equation x=x0+v0t+1/2at^2, but i...
May 12, 2016

math
Nevermind. I figured it out. Key was 1 ppm is 1mg/L. 1.15 mg/L * 100,000 L = 115,000 mg (115g)
May 12, 2016

math
How many gram of sodium fluoride should be added to 100000 liter of drinking water containing 0.6 ppm of sodium fluoride to provide a recommended concentration of 1.75 ppm? Answer is 115 grams. I keep getting .115 g What am I doing wrong? Please help.
May 12, 2016

Chemistry
If 27 grams of propane react with 88 grams of oxygen to make carbon dioxide and water then how many grams of carbon dioxide can be made?
May 11, 2016

ss
1.B 2.A 3.D 4.C 5.A 6.C 7.D 8.B 9.C 10.A 11.D 12.A 13.C 14.A 15.D 16.C 17.B 18.C
May 11, 2016

chemistry
if an ideal gas has a pressure 2.47 atm, a temperature 86.78C and has a volume of 23.83L how many moles are in the sample
May 4, 2016

Physics
an artist designs a mobile of light horizontal rods connected by vertical strings and supporting various shaped weights. Find the magnitudes w2, w3, and w4 if w1= 1.00 unit of weight. The numerical values given in the figure all have units of length.
May 2, 2016

geography
what are the causes of poor service delivery
May 1, 2016

chemistry
What is the concentration of IO3- (total volume: 20mL) when you have .00001mol of HSO3- (total volume: 10mL)? Use the balanced equation IO3-(aq)+3HSO3-(aq)>>>I-(aq)+3SO4^2-(aq)+3H+(aq)
May 1, 2016

chemistry
How to find the moles of IO3- reacted when you have .00001mol of 10mL HSO3-? Using the equation IO3-(aq)+3HSO3-(aq)>>>I-(aq)+3SO4^2-(aq)+3H-(aq)
May 1, 2016

Science Check answers
2) What phenomenon naturally warms Earth's lower atmosphere and surface? • the formation of sunspots • changes in the shape of Earth's orbit • global warming (MY ANSWER) • the greenhouse effect 3) Which of the following is an example of human impact...
April 29, 2016

History
Explain the impact of the Balfour Declaration on the Middle East. Explain the impact of the Japanese attack on Pearl Harbor.
April 27, 2016

chemistry
Use PV=nRT to find n, the moles of hydrogen gas. V= 1.68x10^-2 L P= 715 torr-VP of water at 25C (about 25 torr; look it up in Wikipedia) T= 298.2K R = Applicable value for the above units.
April 27, 2016

Science- Density
I'm having difficulty understanding density. I am trying to relate the concept of density to brownies. Should a brownie with baking soda have a higher or lower density compared to a brownie with no baking soda? Does a thick brownie mean a high or low density? When it says ...
April 24, 2016

Physics
A military gun is mounted on a railroad car (m = 1500 kg). There is no frictional force on the car, the track is horizontal, and the car is initially at rest. The gun then fires a shell of mass 30 kg with a velocity of 300 m/s at an angle of 40° with respect to the ...
April 23, 2016

Physics
two particles of mass m1=1.5 kg, and m2=3.5 kg undergo a 1-dimensional head-on collision. Their velocities along x are V1i=12 m/s, and V2i=-7.5 m/s. The 2 particles stick together after the collision. a.) Find the velocity after the collision. b.) How much kinetic energy is ...
April 23, 2016

Physics
A skier of mass 110 kg travels down a frictionless ski trial. a.) If the top of the trail is a height 200m above the bottom, what is the work done by gravity on the skier? b.) Find the velocity of the skier when he reaches the bottom of the ski trail. Assume he starts form ...
April 22, 2016

Math-Trig
Answer to four significant figures, or to the nearest minute. f) one vertex angle of a rhombus is 25°. Find the ratio of the diagonals.
April 18, 2016

Statistics life orientation
Yes
April 14, 2016

Math
John can paint a room in 3 hours. His apprentice, working alone, requires 6 hours to do the same job. How long would it take John and his apprentice, working together, to paint the room if they continue to work at the given rates?
April 14, 2016

algebra
find the amount of an annuity that consists of 22 monthly payments of $800 each into an account that pays 2% interest per year, compounded monthly.
April 12, 2016

Language arts unit 3 lesson 5 second read
1.A 2.A 3.B 4.B 5.D
April 11, 2016

PHYSICS!!
The answers are: a)6.79 m/s b) 55.2J Not too sure on how to get these answers!!Please Help!
April 11, 2016

PHYSICS!!
Squids and octopuses propel themselves by expelling water. They do this by taking the water into a cavity and then suddenly contracting the cavity, forcing the water to shoot out of an opening. A 6.50 daN squid (including the water in the cavity) that is at rest suddenly sees ...
April 11, 2016

physics
A spring has an unstretched length of 10 cm . It exerts a restoring force F when stretched to a length of 12 cm . For what total stretched length of the spring is its restoring force 3F? At what compressed length is the restoring force 2F? I keep doing this but I do not think ...
April 11, 2016

math
Anna is designing rectangular garden that has an area of 182 square feet, and the length is longer than the width. The table lists the possible whole number dimensiones for the garden. Which dimensiones are missing?
April 4, 2016

home economics management
What are the careers in home economics
April 4, 2016

Physics
What is the potential energy, in joules, of a spring with a force constant of 6 N/m when it is stretched 20 cm from its unstretched length
March 31, 2016

Geometry
A segment with endpoints (3, -2) and (4, 2) is dilated to the image segment with endpoints (9, -6) and (12, 6). What is the scale factor for the dilation? 3 2 6 **my choice 9 **i feel its this one too, im stuck
March 31, 2016

Biology
Which organelle would you expect to find in the cells of a fern, but not in a flatworm? chloroplast **my choice nucleus ribosome mitochondria
March 31, 2016

English
Lol ok
March 29, 2016

English
Why does the Rabbi's son abandon his father on the march to Buchenwald? He believes his father is better off without him. He wants to be free from the responsibility of his father. He doesn't want to tell his father he doesn't believe in God. <~my choice He ...
March 29, 2016

math
You are dealt one card from a standard​ 52-card deck. Find the probability of being dealt a card greater than 2 and less than 7. I got 5x4=20/52=5/13
March 28, 2016

Spanish
d
March 28, 2016

math
The length of a rectangular piece of steel in a bridge is 4 meters less than triple the width. The perimeter of the piece of steel is 56 meters. Find the length of the piece of steel. Find the width of the piece of steel.
March 22, 2016

math
An automobile tire has a diameter of 63 cm. What is the circumference of the​ tire? (Use pi equals3.14 as an approximate​ value.)
March 22, 2016

math
This table shows the distances and time wade walked in two days. Friday 1.5 miles 0.5 hours Saturday 1.15miles 0.4 hours on which of these days did wade walk at a faster rate?
March 20, 2016

math
6 points above par is represented by a negative number
March 19, 2016

math
two cruise ships sail from NY to FL.ONE ship make the round trip in 8 days.the other ship make the round trip in 10 days.both ships sail from ny today.which is the fewest number of days before both ships will sail again from newyork on the same day?
March 19, 2016

math
if a number line is divided into 8 equal parts,then each part represents %
March 19, 2016

math
sade found that 75% of 60 is the same as 30% of another number,n.what is the value n?
March 19, 2016

math
Aj bought a portable game system on sale for $150.the portable game system was 70% of the regular price.aj concluded that the original price of the portable game system must have been $225. Aj correct? justify your answers part b is 70% of an original price the same 30% of an ...
March 19, 2016

Algebra
A rectangular lap pool has a constant depth. The length of the pool is 9 times the width, and the surface area of the water is 81 square feet. What are the dimensions of the pool? Include units.
March 17, 2016

History
magine you work in a steel mill in a large industrial city in England in the late 1800s. You live in a neighborhood with other factory workers, and share the same living and working conditions they do. Write a letter to your representative in Parliament expressing your ...
March 16, 2016

math
Sam cut the pie into 6 pieces
March 15, 2016

physics
Women and overweight people often experience backpain. Let us explore the reason for this. Assume the women has a weight of 60.0 daN before pregnancy. Suppose she gains 10.0 daN during pregnancy, due to weight of the fetus, placenta, amniotic fluid, etc. To make the ...
March 15, 2016

Geometry
Which answer is not a theorem or postulate used to prove triangles similarity? SAS SSA ~~my choice SSS AA
March 15, 2016

Geometry
A triangular pyramid is defined by the points .The pyramid is then reflected over the xz-plane. The reflected image is then translated 3 units back, 2 units left, and 4 units up. Write the general rule you use for the reflection. Show the results of your calculations for the ...
March 11, 2016

Geometry
Which is the formula for the surface area of a sphere with radius r? S=4πr2 S=2/3πr3 S=4/3πr3 S=2πr2 ~~My choice
March 10, 2016

Math
Find the sale price Cost:$67.20 Present markup:10%
March 8, 2016

math
How to cut 10 boards that are 7.8 feet long into 2.25 feet long siding for a porch?
March 8, 2016

Math
Toronto is playing Anaheim in the Stanley cup final. The first team to win four games is the new NHL champion. If the probability of that Toronto will win any game is 0.55 determine the probability that Anaheim wins the Stanley Cup.
March 7, 2016

4th grade math
Mario cut a pizza into 9 equal slices. He put a slice on each of 5 plates. What is the measure for the angle of the slices that are left?
March 1, 2016

math
Mario cut a pizza into 9 equal slices. He put a slice of pizza on each of 5 plates. What is the measure for the angle of the slices that are left?
February 29, 2016

Art
No that's wrong the only thing that's right is 3.😒 Thanks alot
February 29, 2016

Chemisty
You have 775 mL of an 0.11 M acetic acid solution. What volume (V) of 1.10 M NaOH solution must you add in order to prepare an acetate buffer of pH = 5.05? (The pKa of acetic acid is 4.76.) I don't know what to do!!! HELP!!!!
February 28, 2016

Art
What was the answer?
February 26, 2016

Geometry
What does the radius of a sphere join? any two points on the sphere and does not contain the center any two points on the sphere and contains the center <~my choice any two points on the sphere the center and a point on the sphere
February 25, 2016

Poetry 7 - Check please!
me too thx anonymous
February 24, 2016

Geometry
What does the diameter of a sphere join? any two points on the sphere any two points on the sphere and contains the center <~my choice any two points on the sphere and does not contain the center the center and a point on the sphere
February 24, 2016

Math
THis is the question posed to me by mi bio teacher. THe more specific of it it is, "find the masss of a liver cell, assuming it has the shape of a cube, with the diameter and density of water."
February 23, 2016

Math
So, I need to find the mass of a cube. I have diameter of 16.4 micrometers, and density of 1,000 kg/m3. I can find all kinds of formulas for spheres, but not for cubes?
February 23, 2016

History
What did John Locke believe? Absolute monarchs have the right to rule through divine right. God should not be involved in the affairs of mankind. All governments should have three branches with equal power. <~my choice It is the governments job to protect the natural rights...
February 19, 2016

Art
Is it c?
February 19, 2016

Maths
Find a number between 20 and 30 that is half the sum of its factors
February 18, 2016

Art
c
February 17, 2016

Geometry
In the surface area formula for cylinders, which expression represents the lateral area? πrh 2πrh <~my chocie πr*2 2πr*2
February 17, 2016

Art correct me!!
what is the answer?
February 17, 2016

Art
1.C 2.A 3.C 4.D 5.B
February 16, 2016

History
2. In the space below, create a simple time line that traces the emergence of a constitutional monarchy in England during the seventeenth century. It is not necessary to include exact dates, but events should be in the correct order. Include at least eight events that were ...
February 12, 2016

Precalculus
sketch the graph of each equation y=4x-x2
February 7, 2016

math
The master bedroom of Julie's new apartment measures 10.5 feet by 16 feet. What is the area of the room?
February 6, 2016

HISTORY
1. Explain from the Gilded Age that supports the "the farmers were up in arms." 2. What is one change in the South between 1877 and 1900 that reflected the policies of the New South agenda?
February 4, 2016

phys
I got it it was 2.1 x .5 then i calculated it now I am trying to figure out What the car's displacement is from its original position? how would I figure that out do I divide from the 2.1 and the 1.05?
January 31, 2016

phys
A circular test track for cars has a circumference of 2.1 km . A car travels around the track from the southernmost point to the northernmost point what distance does the car travel?
January 31, 2016

Chemistry
thank you so much DrBob222 ^^
January 22, 2016

Chemistry
A certain amount of calcium reacts with water and the formed hydroxide 49g completely neutralized phosphoric acid. Calculate the volume of hydrogen obtained, at STP, and the mass of calcium.
January 22, 2016

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