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May 30, 2015

Posts by dani


Total # Posts: 249

algebra
what is (5x^2-4)+(-3x^2-9)? thanks
October 4, 2011

Physics
An arrow is shot at a 30 degree angle with the horizontal. It has a velocity of 49m/s. The acceleration of gravity is 9.8 m/s2. How high will the arrow go?
September 22, 2011

Physics
An arrow is shot at a 30 degree angle with the horizontal. It has a velocity of 49m/s. The acceleration of gravity is 9.8 m/s2. How high will the arrow go?
September 22, 2011

Physics
An arrow is shot at a 30 degree angle with the horizontal. It has a velocity of 49m/s. The acceleration of gravity is 9.8 m/s2. How high will the arrow go?
September 22, 2011

scientist
Scientists performed an experiment to determine whether there is a connection between learning ability and food. They took two groups of 20 mice each, all from the same purebred strain. The mice were deprived of food for 3 days and then given a standard learning session in ...
September 4, 2011

Math
3(7-4)^2??
August 24, 2011

Physics
Two forces are applied to a car in an effort to move it, as shown in the following figure, where F1 = 402 N and F2 = 364 N. (Assume up and to the right as positive directions.)(F1 is 10degrees and F2 is 30degrees) (a) What is the resultant of these two forces? magnitude ...
May 3, 2011

Physics
Two objects with masses of 1.00 kg and 7.00 kg are connected by a light string that passes over a frictionless pulley as in the figure below. (a) Determine the tension in the string. (b) Determine the acceleration of each object. (c) Determine the distance each object will ...
May 3, 2011

Physics
An outfielder throws a 0.150 kg baseball at a speed of 26.0 m/s and an initial angle of 30.0°. What is the kinetic energy of the ball at the highest point of its motion?
May 3, 2011

Physics
A 7.80-g bullet moving at 530 m/s penetrates a tree trunk to a depth of 6.2 cm. (a) Use work and energy considerations to find the average frictional force that stops the bullet. (b) Assuming the friction force is constant, determine how much time elapses between the moment ...
May 3, 2011

Physics
A ski jumper starts from rest 51.0 m above the ground on a frictionless track and flies off the track at an angle of 45.0° above the horizontal and at a height of 12.0 m above the ground. Neglect air resistance. (a) What is her speed when she leaves the track? (b) What is ...
May 3, 2011

Physics
A rifle with a weight of 30 N fires a 3.0 g bullet with a speed of 250 m/s. (a) Find the recoil speed of the rifle. (b) If a 675 N man holds the rifle firmly against his shoulder, find the recoil speed of the man and rifle. I got .245 m/s for the first one but I keep getting ...
May 3, 2011

Physics
A cannon is mounted on a railway flatcar, the muzzle elevated to 31.4° and pointed in the direction of the track. The cannon fires a 1.10-metric-ton projectile at 1.10 km/s. (a) If the flatcar and cannon together have a mass of 36.0 metric tons (not including the ...
May 3, 2011

Physics
An electric motor rotating a workshop grinding wheel at a rate of 95 rev/min is switched off. Assume the wheel has a constant negative angular acceleration of magnitude 2.40 rad/s2. (a) How long does it take for the grinding wheel to stop? (b) Through how many radians has the ...
May 3, 2011

Physics
A 55.0 kg ice skater is moving at 4.04 m/s when she grabs the loose end of a rope, the opposite end of which is tied to a pole. She then moves in a circle of radius 0.795 m around the pole. (a) Determine the force exerted by the horizontal rope on her arms. (b) Compare this ...
May 3, 2011

Physics
objects with masses of 285 kg and a 585 kg are separated by 0.420 m. (a) Find the net gravitational force exerted by these objects on a 62.0 kg object placed midway between them.
May 3, 2011

physics
A solid, horizontal cylinder of mass 8.0 kg and radius 1.30 m rotates with an angular speed of 5.50 rad/s about a fixed vertical axis through its center. A 0.250 kg piece of putty is dropped vertically onto the cylinder at a point 0.900 m from the center of rotation, and ...
May 3, 2011

Math
Lawrence records the number of minutes he reads each day show below Day 1: 75 mins Day 2: 30 mins Day 3: 25 mins Day 4: 50 mins Day 5: 80 mins How many minutes must Lawrence read on the sixth dat of have mean of 55 minutes read for the 6 day?
April 18, 2011

Math
Triangle ABC is an obtuse triangle with two congruent angles. If m< C = 108 write an expression that represents m<A
April 17, 2011

smk n2
Tent. sudut yang lebih kecil dari perpotongan bidang 5x-14y+2z-8=0 dan 10x-11y+2z+5=0 (tent sudut antara normal-normalnya)
April 14, 2011

Math
What is probability
March 30, 2011

Calc
The temperature at any point in the plane is given by function f(x,y) = 100/(x^(2)+y^(2)+1). Find a direction at the point (3,2) in which the temperature does not increase or decrease. Help, please? Thank you.
February 27, 2011

Calc
The directional derivative of z = f(x,y) at (2,1) in the direction toward the point (1,3) is -2/sqrt(5), and the directional derivative in the direction toward the point (5,5) is 1. Compute dz/dx and dz/dy at (2,1). I have no idea how to solve this problem. Help, please? Thank...
February 27, 2011

MATH
A rectangular flower is 20 inches long,8 inches wide ,and 6 inches high . True of false. If andy fills the flower pot 2/3 full of soil, the expression 2/3(20 + 8 + 6) could be used to find the about of soil he needed.
February 27, 2011

ALGEBRA
i need help with this problem
February 23, 2011

Chemistry Help!!
a kilogram of aluminum metal and a kilogram of water are each warmed to 75 degree Celsius and placed in two identical insulated containers. one hour later, the two containers are opened and the temperature of each substance is measured. the aluminum has cooled to 35 degree ...
January 19, 2011

Physics
A 14,245N auto with a velocity of 6.0m/s crashes into a brick wall. If the car moves 64.0 cm before coming to a stop, what average force does the car exert on the wall?
January 13, 2011

Physics
A 14,245N auto with a velocity of 6.0m/s crashes into a brick wall. If the car moves 64.0 cm before coming to a stop, what average force does the car exert on the wall?
January 13, 2011

math
80.00
December 26, 2010

chem: gases, liquids, solids
How many kilojoules of heat is required to completely covert 60.0 grams of water at 32.0° C to steam at 100°C? For water: s = 4.179 J/g °C (delta)H fusion = 6.01 kJ/mol (delta)H vap = 40.7 kJ/mol
November 30, 2010

Chemistry: gases, liquids, solids problem
4 NH4NO3 -> 8 H2O + 4 N2 + 2 O2 What will be the total volume in liters of gas produced at 720. mm Hg and 570.0°C when 2.50 g of NH4NO3 completely decomposes? Use molar masses with at least as many significant figures as the data given.
November 30, 2010

Chemistry
thanks Liliana! and everyone else.
November 20, 2010

science
explain why a single5 500 kg block of granite weathers much more slowly than 100 chunks of granite weighing 5 kg each.
November 18, 2010

chemistry
A 3.0% by mass solution of H2O2 contains 3.0 g of H2O2 per 100 g of solution. (3.0 g H2O2 / 100 g solution) x (1.01 g solution / 1 mL solution) x (1000 mL / L) = 30.3 g H2O2 / L (30.3 g H2O2 / L) x (1 mole H2O2 / 34.01 g H2O2) = 0.8909 moles H2O2 / L = 0.89 M to 2 sig figs
November 17, 2010

math
_______7m______ |\ / | | \ 2.8m 2.8m / | | \ / | | n \ / | | / \ n | | / \ | | / \ | / 2.8m 2.8m \ | ____________ \ | Find the area of each shaded region( n not shaded). Assume that all angles that appear to be right angles are right angles.
November 16, 2010

Math
This irregular shape has 2m,2m,2m, 3m, 4m, 7m _2m_ _2m_ | |2m__3m_| | | | |________| 4 m 7 m how would I find the area if you can't tell how it is so you can't answer it I understand
November 16, 2010

Math
A= 10,560 ft x 2 mi
November 16, 2010

Math
Find the measures of two supplementary angles if the difference of their measures is 56 degrees I know supplementary angles are the sum of the measure if two angles is 180 degrees but then what is the question asking?
November 16, 2010

math
A= 5 m x 200 cm A= 500 cm x 200 cm A= 100000 cm2?
November 16, 2010

math
How do areas of two parallelgrams compare when the dimensions of one are three times the demensions of the other?
November 16, 2010

math
A= 100 cm x 1 m A= 100 cm x 100 cm A=10000 cm2?
November 16, 2010

math 7th
similar figuers have the same shap but not the nesessarily the same size. They have corresponding angles and corresponding sides. What exactly do you need help with?
November 16, 2010

math
but I don't get how to tell if it is m or cm
November 16, 2010

math
A= 0.5 m x 20 cm
November 16, 2010

math
the answer is 1m2
November 16, 2010

math
A square with an top as 100cm and a side with 1 m A= b x h A= 100 x1 A= 100 cm2 or m2?
November 16, 2010

Weather & Climate (science)
Why is it that an Aneriod Barometer Can be used to measure elevation as well as air pressure?
September 14, 2010

math
How are sales tax and discounts figured? specifically socks @ $2.99 and 5.5% sales tax
September 12, 2010

biology
when the peple are having s*x
September 8, 2010

Weather & Climate (science)
okayy and there are alot more questionss
September 8, 2010

Weather & Climate (science)
Which ones/one is true? a.)Altitude affects density b.)Altituce is the dictance above sea level c.)Altitude is also call elevation
September 8, 2010

Weather & Climate (science)
Thankss
September 8, 2010

Weather & Climate (science)
1.A(an)_________________ barometer Has a closed space surrounded by metal 2.A(an)_________________ barometer Has a glass tube that is open at the bottom end. ive been tryin thesse for ever! when awncering put like for example ur goi no awncer #1 put 1. then the awncerr
September 8, 2010

science
either e or c
September 8, 2010

Weather & Climate (science)
i just added them to the current questions
September 8, 2010

Weather & Climate (science)
Thankss. Can you help me with some more problemss?
September 8, 2010

Weather & Climate (science)
1. an insturment used to measure air pressure is a(an)___________________________________.
September 8, 2010

Algebra/Word problem
320! i thinkk
September 8, 2010

7th grade
what he said
September 8, 2010

spanish
Correctt
September 8, 2010

6th grade math
But how does it awnser in part related to factors of 10
August 31, 2010

math
i need some serious help with limits in pre-calc. here are a few questions that i really do not understand. 1. Evaluate: lim (3x^3-2x^2+5) x--> -1 2. Evaluate: lim [ln(4x+1) x-->2 3. Evaluate: lim[cos(pi x/3)] x-->2 4. Evaluate: lim x^2+x-6/x^2-9 x--> -3 5. ...
July 13, 2010

statistics
Give an estimate for each expression in Exercises, Then state whether you believe that the exact answer is greater than or less than the estimate. Explain how you decided. Use a calculator to check the accuracy of your estimate. 978 X 66
July 10, 2010

alegbra
b
May 30, 2010

computers
Can you find both multitasking system and a multiprocessing system operating system?
May 26, 2010

algebra
Thank you for the information.
May 13, 2010

algebra
I have one more step in my question. I have to Find the value of 10^-2.4 by putting this value in a calculator. I do not have a calculator to do this, can anyone help me out?
May 13, 2010

language
Because a compound is when two words are joined together to make one word. Black alone ia a word. Is ness?
May 9, 2010

language
no examples eye + ball= eyeball grand + mother = grandmother
May 9, 2010

language
A compound word is made when two words are joined to form a new word
May 9, 2010

language
Homonyms are words that sound like one another but have different meanings. B
May 9, 2010

Algebra- IS this right?
Evaluate The Logarithmic Equation For 3 Values Of X Greater Than -1 3 Between -2&-1 &x=-1 Y = Ln(x + 2) Y = Ln(x + 2) ,x=3,y=1.6,1.6>-1. X=-1,y=0.
May 9, 2010

Algebra- IS this right
Evaluate The Exponential Equation For 3 Positive, 3 Neg. Values Of X &x=0 Y=3^-x" Y=3^-x,x=3y=1/27, x=-3,y=27,x=0,y=1.
May 9, 2010

Algebra
I need to rewrite the following as an equivalent logarithmic yt = x I wrote logy=logt=logx. My teacher said that was wrong. Can someone guide me on the right answer?
May 8, 2010

Algebra
Given log b 3 = 0.8397 and log b 7 = 1.4873. Find log b 3b Is the right answer 0.8397
May 7, 2010

algebra
My choices for this question are a x = log8 over log 3 b x log = log 8 c x=log 3 over log 8 d x= ln8 over ln3
May 5, 2010

algebra
My choices for this question are a x = log8 over log 3 b x log = log 8 c x=log 3 over log 8 d x= ln8 over ln3
May 5, 2010

algebra
Can you please tell me me if the expression or equation that is equivant to 8^x=3 would be x log 3 = log 8?
May 5, 2010

algebra
Rewrite the following as an equivalent logarithmic equation.Do not solve. y^t = x answer logy+logt=logx-is this right also Express as an equivalent expression that is a sum of logt (3ab) the t is at the bottom of the g answer log3+loga+logb logarithms.
May 5, 2010

Is this right
I need to express as an equivalent expression that is a sum of logarithms. logt 13ab2 is this right (log+13t+loga+log+b+log+2)
May 4, 2010

Is this algebra question right
Do you rewrite the following as an equivalent logarithmic equation yt=x as E^2-2=7.3891?
May 4, 2010

Algebra
what would be the approximation to the nearest ten-thousandth log 8900 over log 110?
May 4, 2010

algebra
Not sure where to go next. I need to solve this quadratic equation 7x^2-5=0. This is what I have so far, not sure where/what to do next x=2/7 x=sqrt2/7 or x=-sqrt2/7* =+/-sqrt2/7 +/-sqrt14/7 not even sure if this is right.
May 3, 2010

algebra-Am I right so far
Use the quadratic formula to determine the x-intercepts (if any)f(x)=2x^2=2 am I right so far? f(x)ax^2+bx+c y=ax^2+bx+c y=2x^2+2 y=0=>2x^2+2=0 =>2x^2+2=0 ax^2=2,bx=2,c=0 x=b=sqrtb^2+4ac over 2a x=(2)+sqrt(2)^24(2)(0)over2(2) x=sqrt4+4over 2
May 2, 2010

algebra
Is the line of symmetry in f(x)= -(x-2)^2+2 x=2
April 28, 2010

algebra
Would the vertex of f(x)= -(x+3)^2+4 be (-4,3)?
April 28, 2010

algebra
Thank you
April 28, 2010

algebra
Use the formula 4.9t^2 +vot=s, where t is the time in seconds, vo is the initial velocity, and s is the distance in meters. Approximately how far will an object fall in 4 seonds, if it is thrown downward at an initial velocity of 20 meters per second (vo) from a helicopter? Is...
April 28, 2010

algebra
I am totally lost on how to solve g(x)=2x^2+3x-1 to find the y and x-intercepts. This is what I have so far, but I don't know if I am on the right track. And if so what would be next? g(x)=2x^2+3x-1 =2x^2+3x -1 =(2x^2+3+6) +3-1
April 28, 2010

Math
solve using the quadratic formula. 3x^2/4 - 1x/4 - 1/2 = 0
April 27, 2010

Algebra
How would I write a quadratic equation having the given numbers as solutions 4i, -4i
April 25, 2010

Algebra
Can someone help me with this question? Use the discriminant to determine whether the following equations have solutions that are:two different rational solutions: two different irrational solutions: exactly one rational solution: or two different imaginary solutions. s^2-5s-6=0
April 25, 2010

algebra
Graphing Quadratic Functions Find any x-intercepts and the y-intercept. If no x-intercepts exist, state this g(x)=2x^2+3x-1
April 23, 2010

algebra
Thank you so much for your help
April 23, 2010

algebra
How do you solve the quadratic formula 9 over 8 - 2 =5 over x^2
April 23, 2010

algebra
Thank you for taking the time to help me out
April 23, 2010

algebra
How do you solve the quadratic equation 7x^2-5=0
April 23, 2010

college algebra
Quadratic formula solve 9 over 8 - 2= 5 over x^2
April 23, 2010

college algebra
Sorry, I did not see it posted the first time so I didn't think it worked.
April 23, 2010

college algebra
How do you solve the Quadratic equation 7x^2-5=0
April 23, 2010

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