Saturday
February 13, 2016

# Posts by luis

Total # Posts: 256

Math
5x-2y=4 X+2y=8
February 10, 2016

math
Which correctly renames 2/3 and 1/2 using a common denominator??
January 20, 2016

physics
A water-skier is being pulled by a tow rope attached to a boat. As the driver pushes the throttle forward, the skier accelerates. A 83.0-kg water-skier has an initial speed of 5.9 m/s. Later, the speed increases to 11.4 m/s. Determine the work done by the net external force ...
December 5, 2015

Physics
A baggage handler throws a 16.0 kg suitcase horizontally along the floor of an airplane luggage compartment with an initial speed of 1.10 m/s . The suitcase slides 2.10 m before stopping.
November 18, 2015

Math
Use similar triangle to solve. A person who is 6 feet tall standing 140 feet from the base of a tree and the tree casts a 150 foot shadow. The person's shadow is 10 feet in length. What is the height of the tree?
November 17, 2015

chemistry
Which is the correct expression for Keq when the chemical reaction is as follows: N2 + 3H2 2NH3.
November 16, 2015

words problems
a car rental offers two plans-plan a \$20per day and 12 cents per mile -plan b -\$65 per day free unlimited mileage
October 25, 2015

chemistry
onsider the following reaction between sulfur trioxide and water: SO3(g)+H2O(l)→H2SO4(aq) A chemist allows 61.5 g of SO3 and 11.2 g of H2O to react. When the reaction is finished, the chemist collects 59.3 g of H2SO4.
October 9, 2015

math
The truck is 5m
October 8, 2015

Physics
A sports car skids to a stop, leaving skid marks 290 m long. If the coefficient of kinetic friction between tires and pavement is 0.80, how fast was the car going before the skid?
October 4, 2015

math complex number
Solve (-2+i) / (3-2i) and my answer is (-8-i) / 13. Correct?
September 5, 2015

Geometry
Can I please get some help? by+2/3=c, for y
August 27, 2015

Science
The lesion is located in the right thorax just lateral to the mid-saggital plane
August 24, 2015

Algebra
When 2 parents and 3 children visit a theme park the admission cost is \$57. The cost is \$33 for 1 parent and 2 children. Find the cost for 1 adult and the cost for 1 child?
July 2, 2015

math
kate and alan sell stereos. last month kate sold 24 more stereos than alan. together they sold 164. How many stereos did allan sell?
April 22, 2015

Stats
A professor believes that all Thursday sections are cursed and will always score lower on tests compared to Monday sections. To tests this he collects samples of test scores from these two sections. For Monday's section, the mean test score was 60, the estimated population...
April 15, 2015

Math
My 10th grade teacher gave us geometry homework and this problem has me stumped for sure. This rhombus has three interior angles: (5x-2)°, (8y+2)°, and (3x+22)° . We are supposed to find the value of x and y. I tried to use an equation by assigning the fourth angle...
March 12, 2015

Statistics
In a nominal data set, what is the preferred measure of central tendency?
February 24, 2015

math
a bicycle with a diameter of 24 inches is pedaled at a speed of 70 rotations per minute. find the distance the bike will travel in 48 mins
February 18, 2015

physics
A football is thrown with an initial upward velocity component of 13.5m/s and a horizontal velocity component of 16.5m/s How much time is required for the football to reach the highest point in its trajectory? How high does it get above the ground?How much time after it is ...
February 18, 2015

Statistics
A population has u=100 and o=20. If you select a single score from this population, on average, how close would it be to the population mean? Explain your answer. I don't understand the question itself. Please help.
February 17, 2015

Math
The following set of numbers respresents the average weekly scores of 9 preschoolers on a verbal aggression scale. 19.1, 18.9, 33.5, 18.7, 28.1, 31.5, 20.3, 30.1, 17.9 Consider this to be the entire population of scores. What is the standard deviation? I already have the mean ...
February 16, 2015

fundamental skills
When a teacher chooses learning objectives for a child, which question should be asked? A. What should Kelly learn next? B. Where's Kelly in the learning process? C. Do the plan and materials fit my lesson? D. Has Kelly learned what was taught? c.
February 15, 2015

fundamental concepts
Free play, eating a snack, painting, hearing a story, and so forth are related to which of the following learning concepts? A. Space B. Classification C. Size D. Time a.
February 15, 2015

fundamental skills
An 18-month-old child putting large beads in a plastic bowl and pouring them out is A. developmentally superior. B. normal and appropriate. C. developmentally inferior. D. abnormal. my answer I think is a.
February 15, 2015

fundamental skills
What must a teacher provide for an open-ended question to be successful? A. Heuristics B. Background information C. Discrepant events D. Disequilibrium my answer I think is b
February 15, 2015

physics
A warehouse worker pushes a crate along the floor, as shown in the figure (Figure 1) , by a force of 9.0N that points downward at an angle of 45∘ below the horizontal. Q1 Find the horizontal component of the push Q2 Find the vertical component of the push.
February 12, 2015

Math
Thank you so much! I had already asked this question before but they never explained to me how they got the 198. I really appreciate.
February 3, 2015

Math
A classroom of n = 10 children has a mean score of 17.200 on a measure of hyperactivity. One new child is added to the class, and the mean hyperactivity score for the resulting classroom including all the children is 18.000. Find the value of the new child's hyperactivity ...
February 3, 2015

Stats
How did you get 198?
January 31, 2015

Stats
A classroom of n = 10 children has a mean score of 17.200 on a measure of hyperactivity. One new child is added to the class, and the mean hyperactivity score for the resulting classroom including all the children is 18.000. Find the value of the new child's hyperactivity ...
January 31, 2015

Math
Ah, thank you. I really appreciate it. (:
January 31, 2015

Math
So my mistake was I didn't use enough digits after the decimal place?
January 31, 2015

Math
A pill weighs 70 mg. 7/9 of the pill is the active ingredient. How many milligrams are in the part of the pill that is not the active ingredient? So if 7/9 is active that means 2/9 is not active. I did 2 divided by 9 which gives me .22 I then multiplied 70 by .22 which gives ...
January 31, 2015

Managemnet
How to prepare an EFAS table for United Technologies.
January 28, 2015

Fund. concepts skills
Which of the following activities emphasizes the concept of comparing? A. Dividing pigs and cows into two separate groups B. Dividing farm and wild animals into two separate groups C. Discussing similarities and differences between stuffed and real animals D. Matching animals ...
January 25, 2015

Fundamental concepts skills
Putting objects together in a group based on a common criterion such as color or shape is called A. the same name. B. classification. C. lookalikes. D. match-ups. my answer is b.
January 25, 2015

english - Compare and Contrast
I would appreciate it if someone would be willing to look over my essay real quick. I just would like to know if I made any critical errors. Please do not correct them just point them out so I can fix it. Thank you very much. General instructions from my teacher: If you quote ...
January 19, 2015

chemistry
A 27.00mL sample of an H2SO4 solution of unknown concentration is titrated with a 0.1422M KOH solution. A volume of 40.22mL of KOH was required to reach the equivalence point. What is the concentration of the unknown H2SO4 solution? Any help would be greatly appreciated. (:
December 14, 2014

chemistry
Magnesium has three naturally occurring isotopes: Mg-24 with mass 24.3050 amu and a natural abundance of 78.99 %, Mg-25 with mass 24.9858 amu and a natural abundance of 10.00 %, and Mg-26 with mass 25.9826 amu and a natural abundance of 11.01 %. Calculate the atomic mass of ...
December 14, 2014

chemistry
Calculate the freezing point of a water solution at each concentration. 1.40m? What are the steps to calculate this?
November 19, 2014

chemistry
What is the molarity of ZnCl2(aq) that forms when 18.0g of zinc completely reacts with CuCl2(aq) according to the following reaction? (Assume a final volume of 165mL .) Zn(s)+CuCl2(aq)→ZnCl2(aq)+Cu(s)
November 19, 2014

chemistry
V1= 38.8 n1= 1.60*10^-3 V2= 49.9 n2= ? How do we solve for n2 using avogadro's law?
October 31, 2014

chemistry
Yes, that is true but in my notes the professor never gave us a formula to figure it out. It is asking for an exact number of collisions.
October 30, 2014

chemistry
Imagine that you have an ideal gas in a 8.00L container, and that 2850 molecules of this gas collide with a square-inch area of the container at any given instant. If the volume is increased to 56.0L at constant temperature, how many collisions will occur per square inch of ...
October 30, 2014

Chemistry
Ho w much  water  would  you  need  to  add  to  500 mL  of  a  0.3 M  calcium  nitrate  solution  to  make the  solution  0.1 M? A. ...
October 17, 2014

chemistry
Calculate the theoretical yield of alum if 0.200g of Aluminum was reacted with excess KOH and H2SO4? I don't even know how to start it. Please help. Also I wanted to say thank you for the help I've gotten from this website it has helped me a lot. I feel like I'm ...
October 16, 2014

chemistry
It's asking for it in nanoseconds is there a change in the formula?
October 13, 2014

chemistry
How long does it take light to travel each of the following distances 2462 mi, the distance between Los Angeles and New York. How do we calculate how fast light travels?
October 13, 2014

chemistry
Can you show me how you finished the equation?
September 30, 2014

chemistry
Complete and balance each of the following equations. K2SO4(aq)+BaBr2(aq)→ Would it be K2SO4(aq)+BaBr2(aq)→K2Br2 +SO4Ba? Express your answer as a chemical equation. Enter no reaction if no precipitate is formed. (How can we know if a solid is formed in the product?)
September 30, 2014

Personal Finance (Math)
Becka borrowed \$100 from her cousin at the rate of 6% per year. If the inflation rate was 2% that year, what is her cousin's actual rate of return on the loan? How do you work this out?
September 27, 2014

chemistry
A 4.78-g sample of aluminum completely reacts with oxygen to form 6.67 g of aluminum oxide Use this data to calculate the mass percent composition of aluminum in aluminum oxide. (Sorry need help with this!)
September 27, 2014

Chemisty
How many grams of Cl are in 38.0g of CF2Cl2? I really want to figure out how to do it. I can't seem to understand any of this Chem homework and it's getting me frustrated, please help!
September 26, 2014

math
A Norman window has the shape of a rectangle surmounted by a semicircle. If the perimeter of the window is 16.200 ft. give the area A of the window in square feet when the width is 3.000 ft.
September 6, 2014

Physics, Math
A typical volume of a modern hot air balloon is 2500 cubic metres, and a typical maximum temperature of the hot air is 120 degrees Celsius. Given these figures, and an outside air temperature and density of 15 ∘C and 1.225 kg/m3 respectively, compute the maximum mass (in...
September 2, 2014

Physics
A red ball is thrown down with an initial speed of 1 m/s from a height of 27 meters above the ground. Then, 0.6 seconds after the red ball is thrown, a blue ball is thrown upward with an initial speed of 24.5 m/s, from a height of 0.7 meters above the ground. The force of ...
August 28, 2014

algebra
The following equation is used to find c, the total cost for printing a quantity of high school yearbooks, b. c=5b+200
June 12, 2014

Physics
June stands on the roof of the house which is 22.8 m high and she throws the ball at an initial speed of 4.90 m/s downward at Ben who is 1.80m tall. a) With what speed does she hit her target's head and b) how much time was it in the air? Displacement= 21 m. -Place ...
June 7, 2014

Physics
Frank is traveling the posted speed limit of 36 mi/hr in a school zone. A deer darts out between two cars. He instantly hits the brakes and the car decelerates at a rate of 5.0 m/s^2. a) how much stopping distance will he require in (meters)? b) If he was going twice the ...
June 7, 2014

math last set up
To secure a 618 meter radio tower against high winds, guy wires are attached to a ring 10 meters from the top of the tower. Each wire is anchored 90 meters from the base of the tower. Find the measure of the angle the wire makes with the ground. Round your answer to the ...
May 22, 2014

math
bystander at the Pegasus Parade, is lying on his back and observing a large balloon of a cartoon character, floating directly above Broadway Street. He is located 32 feet from a point on the street directly beneath the balloon. To see the top of the balloon, he looks up at an ...
May 22, 2014

Math
Show 2/4 of the set. How many counters?
April 16, 2014

AP Biology
Why are Eukaryotes more difficult to Transform than Prokaryotes? What methods can be used to transform Eukaryotes?
April 14, 2014

AP Biology
What is the purpose of using a plasmid containing an antibiotic resistance gene in the transformation process?
April 14, 2014

math
A stone is dropped from a cliff 344 feet high. after how many seconds will it be 200 feet above the ground?
April 11, 2014

Math, Geometry
The percent grade of a highway is the amount that the highway raises or falls in a given horizontal distance. For example, a highway with a four percent grade rises 0.04 mile for every 1 mile of horizontal distance. a. How many feet does a highway with a six percent grade rise...
April 4, 2014

Math, Geomertry
A piece of a broken wheel is shown. It was taken to a machine shop to be replaced with a new “whole” wheel. Find the radius of the wheel AC=10cm, BD=3 cm and D is the midpoint of AC. Round to the nearest hundredth.
April 4, 2014

Math, Geomertry
Thank you
April 4, 2014

Math, Geomertry
A total solar eclipse occurs when the moon passes between the earth and the sun, and the darkest shadow cast by the moon, called the umbra, hits the surface of the earth. If the umbra does not hit the surface, as shown in the following figure, then a total solar eclipse is not...
April 4, 2014

Precalculus
Find a unit vector in the direction of the given vector. w=-i-2j Sorry I messed up it was not a one it was a i.
April 3, 2014

Precalculus
Find a unit vector in the direction of the given vector. w=-1-2j
April 3, 2014

Pre calculus
I got (1/Square root of 2,-1/square root of 2) Thanks
April 3, 2014

Pre calculus
Find a unit vector in the direction of the given vector. v=(1,-1)
April 3, 2014

Pre calculus
thank You
April 3, 2014

Pre calculus
P=(-2,2) Q=(3,4) S=(2,-8) PS-3PQ Find the component form and magnitude of the vector.
April 3, 2014

Pre calculus
For the most part, will a law of cosines always be one triangle? As in one triangle to solve?
March 26, 2014

physics
A car entering the freeway accelerates from 10.2 m/s with a constant acceleration of 4.4 m/s2. What is the car’s final velocity when it merges onto the highway and reaches its cruising speed 4.2 seconds later? A 28.7 m/s B 11.2 m/s C 18.5 m/s D 8.28 m/s
March 25, 2014

PHysics XXX
An airplane travels 330 m down the runway before taking off. Assuming that it has constant acceleration, if it starts from rest and becomes airborne in 9.00 s, how fast (in m/s) is it moving at takeoff? A 73.3 m/s B 36.7 m/s C 1490 m/s D 660 m/s
March 25, 2014

AP Biology
The one-pod condition (P) is dominant to the three pod condition (p). Normal leaf (L) is dominant to wrinkled leaf(l). Determine the genotypes for the two parents for all possible matings producing the following: 150 one pod normal, 147 one pod wrinkled, 51 three pod normal, ...
March 14, 2014

Pre - calculus
what happens to the cosine on the right side, when its in this step cos^3x/sinx + cosxsinx^2/sinx
March 5, 2014

Pre - calculus
Can someone please explain how to simplify this proiblem: cotx/sec^2 + cotx/csc^2
March 5, 2014

Math
How does: sin^2(x) - cos^2(x) = 1 - 2cos^2(x)
March 3, 2014

Math
Thank You
March 3, 2014

Math
(cosx - sinx)^2 + (cosx + sinx)^2 = 2 Iam in this step: 2cos^2(x) + 2sin^2(x) = 2 How can I make the equation on the right equal 2
March 3, 2014

A fish swims 12.0 m in 5.0 s. It swims the first 4.0 m in 2.0 s, the next 3.0 m in 1.2 s, and the last 5.0 m in 1.8 s. What is the average velocity of the fish during the time interval between 0.0 s and 3.2 s?
February 27, 2014

Algebra 1
The price of a television set on so it's \$216 versus two thirds of the regular price find
February 9, 2014

geometry
Given: FG (SEG) bisects BT (SEG) BO=7x-6 OT=5x+10 Prove: BO=50
September 19, 2013

geometry
Given: FG (SEG) bisects BT (SEG) BO=7x-6 OT=5x+10 Prove: BO=50
September 19, 2013

math
User: Ariana Bouillon In Course: M/J Mathematics 2 V9 ( 2820) Instructor: Mrs. Susan Lafferty 08.03 Experimental Probability Warning: There is a checkbox at the bottom of the exam form that you MUST check prior to submitting this exam. Failure to do so may cause your work to ...
August 1, 2013

geo
Jackson is creating a water garden surrounded by a triangular patch of grass. If the pond will take up the space indicated by the circle, how many square feet of sod will he need to complete the garden (use 3.14 for and round your answer up to the next foot)?
May 9, 2013

Math
How much farther did chris run on thursday than on wednesday? If he run 3 5/8 on thursday an 1 1/4 on wednesday
May 8, 2013

math
Mrs. Browns girls scout troop had a carwash to earn some funds. they saved 1/6 of the money. They used 1/2 of the money to go horseback riding. They then had \$100 left. How much did they initially make washing cars/
April 18, 2013

Math
If 9m+5=2m+26, what is the value of m?
April 17, 2013

Trig
How do I find the exact value of sin (pi/24)?I am crying
March 17, 2013

trig
Do I subtract ?
March 17, 2013

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