Friday
October 24, 2014

Posts by mike


Total # Posts: 3,198

Chemistry
I THINK ITS 1) The balanced equation is NaHCO3(s) + H+(aq)= Na+(aq) + CO2(g) + H2O(aq). Remember acid + base = salt + water. 2) 2 CaO(s) + 5 C(s) = 2 CaC2(s) + CO2(g) 3)C(s)+H2O(g)=>CO(g)+H2(g 4) CuO (s) + CO (g) Cu (s) + CO2 (g) I THINK THEY ARE RIGHT. CHECK WITH SOMEONE ...
March 8, 2012

physical science
assuming that there are no other nonconservative forces involved what was given to each car during the collision
March 7, 2012

physical science
what was the kinetic energy of each car before breaking
March 7, 2012

algebra
x^+6x+9 using the diamond and generic rectangle
March 6, 2012

Chemistry
probably right
March 6, 2012

math 208
you equation is supposed to be -8n -8 = 4 -8n=12 n=-1.5
March 6, 2012

math 208
the top answer i gave is wrng i think
March 6, 2012

math 208
aint it: -4-2n+2=4 -2n-2=4 -2n=6 n=-3
March 6, 2012

algebra
grandma ploan to finance her grandchilds college education she has 50,000 to invest use a long range investment pln ,cd,saving bond etc. the plan is to earn compound interest.the principal is(p)50,000 interest rate is (r)3.60years for investment is(6)this is time state number ...
March 5, 2012

Jiskha
wow helpin people just for free NICEEE
March 3, 2012

Jiskha
THAnX 4 tellin me!!
March 3, 2012

Jiskha
U guys answr evry question??????
March 3, 2012

Chemisty
THINK IT"S Molar mass C2H5OH = 46 g / mol 7.50 g / 46 = 0.163 moles the ratio between C6H12O6 and C2H5OH is 1 : 2 1 : 2 = x : 0.163 x = 0.0815 moles of C6H12O6 needed molar mass C6H12O6 = 180 g/mol 180 x 0.0815 = 14.7 g
March 3, 2012

spanish
Nosotros les (vender) el auto a unos chicos venezolanos. preterite form of the verb supplied
March 2, 2012

geometry
a sailboat has a sail which is shaped like a right triangle. The base of the triangle is 14 feet and the height is 20 feet. What is the area of the sail? The boat also has two smaller sails that are each half as large as the big one. How big is each of the two smaller sails?
March 1, 2012

spanish
THANX!
February 29, 2012

spanish
type the same qsn on gooooogle and the website is like the 2nd one the heading of the page on gooogle says: How can pierde be used? | SpanishDict Answers
February 29, 2012

statistics
A test was given out to a class of 20 students. The highest possible score to get is 30. The mean of the tests came out to 26. One student was caught cheating and got 20 points removed from their test. what is the new mean. 28,25,24,22 ?
February 28, 2012

Alg
I THINK ITS 30/25 = x/45 x=54 burgers
February 28, 2012

Aviation
What location of CG (forward or aft center of gravity) would be the most fuel efficient? The most stable? Could you change this situation if you changed the design of the aircraft?
February 26, 2012

Math
'one angle is 4 times as large as another angle of the same triangle. the third angle o the triangle has a measure of 60 degress.' what are the measures of the other two angles in the triangle.
February 23, 2012

GeOmEtRy!!!
I THINK ITS THIS : (1/2) x (2h-4) x h = 35 (h-2)h = 35 h^2-2h-35 = 0 (h-7)(h+5) = 0 Positive solution: height = 7 inches base = 2h-4 = 2*7-4 = 10 inches
February 23, 2012

Math
:)
February 23, 2012

Math
Probably (x+3)(x-4)
February 23, 2012

GeOmEtRy!!!
:)
February 23, 2012

GeOmEtRy!!!
I THINK ITS 3x^2 = 75 x^2 = 25 x=+5 or x=-5
February 23, 2012

math
I THINK ITS Each number in the sequence is 9 less than the previous number.
February 22, 2012

statistics
Varsity team try out. Assume the distribution of heights to be normal w/a mean of 64inches & standard deviation of 4 inches. only 15 students passed. how many students joined the try out?
February 22, 2012

statistics
a teacher decides to fail 25% of the class.Examination marks are roughly normally distributed w/a mean of 72 & standard deviation of 6. what mark must a student make to pass?
February 22, 2012

Calc
Write the equation of the line tangent to the graph of the function at the indicated point. As a check, graph both the function and the tangent line you found to see whether it looks correct. (1/x^3 -x)^2 at x= 2
February 21, 2012

calculus
The revenue from the sale of x units of a product is represented by the following formula. R = 10(5x + 1)–1 + 70x – 11 dollars Find the marginal revenue when 50 units are sold. (Round your answer to the nearest cent.)
February 21, 2012

Math
2m+6=2m-1 bring 2m to the other side 0+6=-1 I THINK THE ANSWER IS UNDEFINED because 6cannot=-1
February 18, 2012

Physics
At the moment t=0 a particle starts moving along thr x-axis so that its velocity projection varies as vx= 35 cos pi t cm/s, where 't' is expressed in seconds. Find the distance that this particle covers during t = 2.80 s after the start.
February 17, 2012

math
I THINK ITS THIS: If each line joins just two points, and you want a line joining every pair of points, then it takes 16 * 15 / 2 = 120 lines.
February 16, 2012

Math
multiply by 2 on both sides 6x-4=8x-18 then subtract 6x to the other side -4=8x-6x-18 then add 18 to the other side -4+18=8x-6x and then simplify and then solve for x 14=2x x=7
February 16, 2012

Math
I THINK IT'S THIS: 200=5x-100-2x 200=3x-100 -2=3x -2/3=x
February 16, 2012

geometry
set it up like x/65 = 160/130 solve for x probably u shuld get 80
February 16, 2012

Math
I think its rhombus because A rhombus is a quadrilateral having the following properties.. 1.All the sides are equal 2.Opposite sides are parallel i.e it has two pairs of parallel sides. 3.Opposite angles are equal
February 15, 2012

Math
probably 3/5
February 15, 2012

math
u to
February 15, 2012

math
ohhh okay
February 15, 2012

math
i just answered it
February 15, 2012

math
dont u have a calculator or are u not allowed to use it anyway ithink its this 38/100 simplified it to 19/50 35/100 simplified it to 7/20
February 15, 2012

math
probably 55.371 work: for mixed fraction you 6and4/5 multiply5&6 and add 4 and divide it by 5 8 and 1/7 multiply7&8 and add 1and divide it by 7 you shuld get improper fractions and then turn them to decimals and multiply both of them it wuld be much easier to use a calculator
February 15, 2012

math
use long division for 7/8 and you probably shuld get .875 and then multiply it by 39 and get 34.125
February 15, 2012

math
probably: 506/27 OR in decimals 18.7407
February 15, 2012

math
is it (32/3)*(51/9)
February 15, 2012

Math
welcome
February 15, 2012

Math
so i think its x=0 then solver y 2(0)-3y=6 y=-2
February 15, 2012

Algebra
Ithink its this Let d = number of days then cost of west trip: 450d + 1075 cost of south trip: 375d + 1500 375d + 1500 < 450d + 1075 1500 < 75d + 1075 425 < 75d 5.67 < d answer: 6 days or greater
February 15, 2012

math
welcome
February 15, 2012

math
its sometimes true
February 15, 2012

Spanish
!____!
February 15, 2012

Spanish
I think its: You buy your for your mother?
February 15, 2012

Math
multiply 12 by both sides
February 15, 2012

Math
probably 33.6
February 15, 2012

math:logarithms
put it in your calculator and see if it works
February 15, 2012

Mathe
is it(4m/9)+(13-1m/3)=4 ?????
February 15, 2012

Math, geometry
perimeter of a rectangle = 2width + 2length 30= 2w+2(4) 30= 2w+8 22= 2w w= 11 millimeters
February 15, 2012

Pre- Algebra
subtract 7n to the other side AND subtract 13 to the other side and also divide 3 to the other side,so 7n-5=10n+13 -5=10n-7n +13 -5-13=10n-7n -18=3n n=-6
February 15, 2012

AP CHEMISTRY
why pKa2??
February 15, 2012

math
In math, an array refers to a set of numbers or objects that will follow a specific pattern. An array is an orderly arrangement, often in rows, columns or a matrix. Arrays are used in multiplication and division as it shows a great visual to show how multiplication can be ...
February 15, 2012

math: elapsed time
Do u want to calculate elapse time?
February 15, 2012

math: elapsed time
go on gooogle and type in elapsed time in math. And check: Math:Elapsed Time-eThemes
February 15, 2012

Maths
are u serious? anyway 5cm*10mm/1cm Ans=50mm
February 15, 2012

help in math
1) x^2 - 6x =0 x(x-6)=0 x=o OR x=+6 check: plug these 2 numbers in the first equation (The One I Gave) and see if it equals 0. 2) x^2 -3x=0 x(x-3)=0 x=0 OR x=+3 3) try this one by yourself
February 15, 2012

Algebra 1
Are u sure its direct variation or is that an incomplete question?
February 15, 2012

physics
A. From F=ma i'd say it would be the hummer as its got greater mass, and as Force is constant
February 15, 2012

chemistry
how many moles of oxygen are required for the combustion of 25.5 g of magnesium
February 14, 2012

Math
Help please
February 13, 2012

Math
One angle of a triangle measures 120 degrees. The other two angles are congruent. Write and solve an equation to find the measure of the congruent angles.
February 13, 2012

chemistry
oh no i messed up ! i wrote the wrong elements -_-'' im sorry.And thanks for the website!
February 13, 2012

chemistry
In a particular redox reaction, Cr is oxidized to CrO4^2– and Cu2^+ is reduced to Cu^+ . Complete and balance the equation for this reaction in acidic solution. Cr + Cu^2+ ---> CrO4^2-+ Cu^+ i started off by doing this 2 x SO3^2- ---> SO4^2- + 2e 2 x Cu^2+ +2e ---&...
February 13, 2012

Physics
A sprinter of mass 63.7 kg runs at a constant speed of 10.2 m/s in a straight line. Find the extra force the sprinter must exert on the ground to round a curve of radius 10.8 m.
February 13, 2012

Physics
You are holding a bulletin board weighing 6.46 N in place against a wall while your friend secures it to the wall. To keep it from slipping, you apply a force perpendicular to the bulletin board, pressing it directly into the wall. How large must this force be if the ...
February 13, 2012

chemistry
Assume the density of aqueous HCl is the same as water (1.0 g/mL) and use the densities of ethanol (0.789 g/mL) and water as well as the actual amount of recrystallization solvent used to calculate the mass of recrystallization solvent.
February 12, 2012

Math
4/5-2p/5=6/5 Please help me solve this and show how you did it. Thanks
February 11, 2012

physics
Four charges with equal magnitudes of 6.50 x 10-15 C are placed at the corners of a rectangle. The lengths of the sides of the rectangles are 4.07 cm and 5.28 cm. Find the magnitude of the electric field at the center of the rectangle, assuming that three charges have the same...
February 9, 2012

Chemistry
A sample of 50.0 mL if sulfuric acid that has a density of 1.84 g/mL would have a mass of how many grams?
February 6, 2012

Chemistry
Calculate the mass of a quart (946 mL) of mercury. The density of mercury us 13.6 g/mL?
February 6, 2012

10th grade Math --Shadow-Pull questions
AC=12 Db=32 AD=x
February 5, 2012

Math
A box contains 3 red marbles, 6 blue marbles, and 1 white marble. The marbles are selected at random, one at a time, and are not replaced. Find the probability. P(red and blue and blue) Please help me
February 2, 2012

physics
A moving particle encounters an external electric field that decreases its kinetic energy from 9530 eV to 7800 eV as the particle moves from position A to position B. The electric potential at A is -69.0 V, and that at B is +39.0 V. Determine the charge of the particle. ...
February 1, 2012

physics
An electric car accelerates for 7.2 s by drawing energy from its 430-V battery pack. During this time, 1700 C of charge pass through the battery pack. Find the minimum power rating of the car.
February 1, 2012

Sammons
how to find the product of 38 and 75?
February 1, 2012

College Algebra
WHAT WOULD THE SCORE BE AFTER 4 MONTHS
February 1, 2012

language
idk
January 30, 2012

intro law enforcement
date 9-22-08 fire in a lawyers office main st, ridgefield ct art work was smashed chairs, papers, and curtains started a fire ( match started it) building is empty over night .5 miles from downtown district 1st fire in a chain from arsonist left a law book on the porch what ...
January 30, 2012

chemistry
The energy levels the electron can occupy in the Be3+ ion can be calculated using the energy level equation. A Be3+ ion with an electron in the n= 3.00 level emitted a photon with a frequency of 7.30 × 1015 Hz. What is the value of the level n for the new energy?
January 30, 2012

chemistry
yeah sorry hehe thanks!
January 29, 2012

chemistry
so it would be 0.96 ?is that right? (8x-393.5)+9(-241.8)+x=5113.3 -5324.2+x=5113.3 x=0.96
January 29, 2012

chemistry
For a particular isomer of C8H18, the following reaction produces 5113.3 kJ of heat per mole of C8H18(g) consumed, under standard conditions. C8H18(g) + 25/2(O2)(g) -> 8CO2(g) + 9H2O(g) DeltaH= -5113.3 kJ What is the standard enthalpy of formation of this isomer of C8H18(g)?
January 29, 2012

Center
How is the efficiency of pushing a concrete block up a wooden ramp increased
January 29, 2012

Science
Job Issues related to overdrawing surface water?
January 28, 2012

math
A rectangular parking lot is to be constructed on land bordered on one side by an alley. There is 360 ft of fencing to use along the other three sides. What should be the dimensions of the lot if the enclosed area is to be maximum?
January 27, 2012

Physics
What is the magnitude of the electric field at a point midway between a -5.1 microC and a +6.1 microC charge 10cm apart? Assume no other charges are nearby. What is the direction of the electric field?
January 27, 2012

Problem Solving: Make a Table
725
January 25, 2012

Social studies
To write a paragraph explaining Lincoln's vision of the united states. Make at least 2 references to specific details of the Gettysburg address.
January 22, 2012

pre-algerbra
A farmer is building a square pen 21 feet on each side. He puts one post at each corner and one post every three feet in between. how many posts will he use. please give equation
January 18, 2012

Physics
A person lifts a 5.2 kg cement block a vertical distance 1.2 m and then carries the block horizontally a distance 7.3 m. Determine the work done by the person and by the force of gravity in this process.
January 9, 2012

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