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March 24, 2017

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Posts by Scott

Total # Posts: 1,985

Algebra
u = t + 7 10u + t = 3(10t + u + t + u) ... = 33t + 6u 4u = 32t solve the system by substitution or elimination
February 16, 2017

math
x (154) + (40 - x)(170) = 40 (160)
February 16, 2017

Math
v / 125 = [v / (125 + 25)] + 4/3
February 15, 2017

Physics
1) the sound goes over and back ... 2 w =5.7 * 343 2)velocity = frequency * wavelength ... v = (2.22 / 7.59) * .168 m
February 15, 2017

Physics
3 s measures the km to the lightning 5 s measures the miles
February 15, 2017

Algebra
(k - 10)(k - 2) (2x + 7)(3x - 2)
February 15, 2017

maths
45 * (1 + .10)^20
February 15, 2017

too-hard probability sir damon/reiny/steve help
"you can lead a horse to water...but you can't make him drink"
February 15, 2017

too-hard probability sir damon/reiny/steve help
this is binomial...with a twist P(b) = .4 , P(w) = .6 (b + w)^4 b^4 + 4 b^3 w + 6 b^2 w^2 + 4 b w^3 + w^4 P(w ? 0) = 1 - P(b = 4) = 1 - .4^4 P(b = 2) = 6 * .4^2 * .6^2 divide to find the conditional
February 15, 2017

Physics
the given data is unrealistic please check it
February 15, 2017

physics
the ball is uniformly accelerated by gravitational force the velocity is zero at the peak 1.5 s before the peak, the velocity is ... 1.5 * g upward 1.5 s after the peak, the velocity is ... 1.5 * g downward
February 14, 2017

PreCalc
18 t + 5 t - 5 = 12
February 14, 2017

Algebra 2
x y = k
February 14, 2017

Algebra 2
the job takes 96 people-hours so for 3 people... 96/3 hr
February 14, 2017

Exponential Equation
4E12 = 24 * e^388r ln(1.7E11) / 388 = r
February 14, 2017

Math
3 1/2 is 28 eighths
February 14, 2017

Math
the scale is logarithmic 10^(8.3 - 6.2)
February 14, 2017

Geometry
the four given sides sum to 24 so the 5th side is 6 ... 30 - 24
February 14, 2017

Algebra
x + 2y = 150 x + 4y = 260 solve the system
February 14, 2017

physics
the net force is ... f = m a ... f = 111.5 * 2.7 net force is tension minus gravity t = 111.5 (9.8 + 2.7)
February 13, 2017

Chemistry
2 KClO3 ---> 2 KCl + 3 O2 moles O2 = 3/2 * moles KCl moles KCl = mass KCl / molar mass KCl mass O2 = moles O2 * molar mass O2
February 13, 2017

chemistry
find grams of C in CO2 and grams of H in H2O convert the grams to moles (divide by the molar masses) the mole ratio will give you the empirical formula
February 13, 2017

college algebra
h = 1/2 g t^2 + v t + Ho 44 = -4.9 t^2 + 20 t + 37 solve the quadratic for t
February 13, 2017

Math! Please help!
15 ? -k/4 - 9 24 ? -k/4 96 ? -k ... -96 ? k
February 13, 2017

Chemistry
381 pm is the edge length of the cubic unit cell the atomic radius is the edge length multiplied by ... ?2 / 4
February 13, 2017

Math
2 is 12/6 so you need the lowest common multiple of 12 and 5 ... 60 60/6 = 10 ... five 2 lb bags
February 13, 2017

math
looking at the cross section, this is a circle in an equilateral triangle
February 13, 2017

math
looks good
February 13, 2017

math
plug the points into the general equation and solve the system P...1 = a - b + c Q...1 = a + b + c R...6 = 25a + 5c + c
February 13, 2017

math
P and Q are the same point need 3 DIFFERENT points
February 13, 2017

Chemistry
22.4 L/mole ... gas at stp octane is 114 g/mole 2 C8H18(g) + 25 O2(g) ---> 16 CO2 (g) + 18 H2O(l) (39.0 / 114) * 12.5 * 22.4 L
February 12, 2017

physics
work = force * distance f = 5497 / 22.1 a = f / m = 5497 / (22.1 * 3090) d = 1/2 a t^2 ... t = ?(2d / a) v = a t
February 12, 2017

Algebra
3a + 9c = 183 ... 6a + 18c = 366 6a + 13c = 276 subtract equations to eliminate a solve for c, then substitute back to find a
February 12, 2017

Algebra
(r + 3) / 79 = r / 15 15 r + 45 = 79 r
February 12, 2017

sciance
depends on the car
February 12, 2017

Physics
yes the up-thrust (bouyancy) is a function of the VOLUME of liquid displaced
February 12, 2017

grade7 math
the rectangle with the least perimeter is a square
February 12, 2017

Chemistry
you aren't given the atomic mass not enough data for a solution
February 11, 2017

Chemistry
the volume of hexane is ... 338 g / .66 g/mL the height of the liquid is ... (hexane vol) / (? *2.91^2)
February 11, 2017

physics
energy = 1/2 m v^2 energy / time = power
February 11, 2017

Algebra 2
a^b = 3^3 3^(1/2)^x = a^(1/6) 3^3^x = a 3^3 = a^(1/x) x = 1/b
February 11, 2017

math
the slope is the same everywhere on the line slope = (-5 - 7) / (-5 - 4)
February 11, 2017

math
the distance is constant, so speed and time are inversely proportional t / 28 = 65 / 78
February 11, 2017

Math
c (100% - 56%) = 202.92
February 10, 2017

Math
m = [(91 - 44.39) / 44.39] * 100%
February 10, 2017

physics
how thick is the ice?
February 9, 2017

math
adding equations to eliminate e ... 3d = 12 solve for d, then substitute to find e
February 9, 2017

Math
3.36E6 poeple / 3 per household = ... 1.12E6 households 2 bags per month = 24 bags per year ... 10 lbs per bag 1.12E6 * 24 * 10 = ?
February 9, 2017

Math
a square m is 10000 square cm
February 9, 2017

chem
it will appear that there are more moles of solute than are actually present you will be dividing the mass of added solute by too large a number ... this will result in the molar mass being too low
February 9, 2017

geometry
the two angles sum to 180º x + (4x + 50) = 180
February 9, 2017

Chemistry
that's what you start with ... some of it is precipitated out also, the volume of the solution is more than doubled (remaining PbCl2) / solution volume
February 9, 2017

Science ms sue please help
the question specifies "chemical property"
February 9, 2017

Science ms sue please help
if there is no reaction...what are you observing?
February 9, 2017

algebra
c + r = 4.5 14c + 8r = 51 solve by substitution or elimination
February 9, 2017

Mathematics
x = -3 (y + 1) x^2 = 9 (y^2 + 2y + 1) substitute and solve for y there will probably be two solutions ... the intersection(s) of a circle and a line
February 9, 2017

Algerbra
the vertex is on the axis of symmetry ... x = -b / 2a f(x)=x^2+2x-3 ... x = -2 / 2*1 = -1 f(x)=x^2-3x+1 ... x = - -3 / 2*1 = 3/2 plug the x's into their functions to find the y's for the vertex coordinates
February 8, 2017

math
sin(0) = 0 ... sin(90) = 1 so ... sin(50) > sin(40) cos(0) = 1 ... cos(90) = 0
February 8, 2017

Chemistry
there are 1000 L in a cubic metre so the density is 3000 g/L the molar mass is 44.956 g so one L contains ... 3000 / 44.956 moles the number of unit cells is half the number of atoms the volume is ... 1 L / [(3000 / 44.956) * 6.02E23 / 2]
February 8, 2017

math
d = 3 q 10 d + 25 q = 385 solve the system using substitution or elimination
February 8, 2017

Further Mathematics
11th term is 10 cr from 1st term 7 * 3^10
February 8, 2017

Math
-5 = -a + b - c y' = 3a x^2 + 2b x + c ... 4 = 3a - 2b + c y" = 6a x + 2b ... 0 = -6a + 2b 3 equations, 3 unknowns ... solve the system
February 8, 2017

mATH
520 X [1 + (0.04/12)]^60 IS THIS RIGHT WAY TO DO THIS just clarifying
February 8, 2017

Physics
150 kN to pull 12 cars to pull one car ... 150/12 kN
February 8, 2017

physics
momentum is conserved (75 * 2) + (50 * v) = 0
February 8, 2017

Math
x * x * (x - 3) * (x + 1)
February 7, 2017

Chem
reacts with water to form sulfuric acid this is the "acid rain" reaction
February 7, 2017

Math
it's an even power regardless of the sign of x, f(x) will always be positive
February 7, 2017

Math
h + c = 160 ... 200 h + 200 c = 200 * 160 500 h + 200 c = 369 * 160 subtract equations to eliminate c solve for h, then substitute back to find c
February 7, 2017

Mathematics
the area of the bottom of the box is ... 3456 / 6 = 576 (x + 12) [(576 / x) + 12] = 1500 x is one dimension, 576/x is the other
February 6, 2017

Physics
800 N * 20 m = 16000 J per second means 16 kilowatts
February 6, 2017

Math
h(g(x)) = 9 - (x + 3)^2 ... = -x^2 - 6x the max is on the axis of symmetry ... x = -b / 2a = 6 / -2 = -3 plug in -3 to find the maximum
February 6, 2017

science
v = mass/density = 2.4 kg / 2.70 g/cm^3 2.4 is only 2 sig fig
February 6, 2017

Math
let x be the edge length of the corner squares the volume of the box is ... v = x (12 - 2x)^2 ... v = 144 x - 48 x^2 + 4 x^3 the 1st derivative will show the maxima/minima plug in the values to find the volume
February 6, 2017

Physics
the difference in densities gives you the "lift mass" per m^3 v = 800 kg / (1.25 kg/m^3 - 0.18 kg/m^3)
February 6, 2017

Physics
the metric unit of pressure is the Pascal (Pa) ... one Newton of force over one square meter a cubic meter of water has a mass of a thousand kg (a metric ton) ... it exerts a force of 9.81 kN stacked 100 high, the pressure at the bottom is ... 981 kPa
February 6, 2017

Algebra
the vertex is on the axis of symmetry x = -b / (2 a) = -6 / (2 * -1) = 3 plug 3 into the function to find the y-coordinate
February 6, 2017

physics
a straw works because when you lower the pressure on one end (by sucking), atmospheric pressure pushes the liquid from the other end the airtight cork prevents the atmospheric pressure from pushing on the liquid, so it won't go up the straw
February 6, 2017

physics
a cubic meter of water is a metric ton ... 1000 kg .4 m^3 / 24 m^2
February 6, 2017

Intermediate Algebra
c + h = 150 ... 325 c + 325 h = 325 * 150 325 c + 525 h = 445 * 150 subtract equations to eliminate c ... then substitute back to find h
February 5, 2017

Math
0 = x^2 - 2x + 15 x = [2 ± ?(4 - 60)] / 2 x = 1 ± i?14
February 5, 2017

physics
v is squared, doubling the uncertainty the value is then divided by y, which adds its uncertainty (2 * 3.34%) + 5.00%
February 5, 2017

physics
v is sq
February 5, 2017

physics
gas is correct
February 5, 2017

physics
the ke at the bottom equals the pe at the top both measured in Joules
February 5, 2017

physics
e = m g h = 7.2 * 9.8 * 1.2 (Joules)
February 5, 2017

math
worst case ... he takes out 5 ya and 7 gp the 13th fruit will fill the requirement
February 5, 2017

maths
find the average area of the top and bottom multiply by the height ... this is the volume in cm^3 divide by 1000 to find litres
February 5, 2017

Algebra
savings is dependent on weeks (98 - 65) / (6 - 3) = $11 / wk
February 5, 2017

Alg/Trig
0 = -16 t^2 + 112 t factoring ... 0 = -16 t (t - 7) 0 = -16 t ... t = 0 (launch) 0 = t - 7 ... t = 7 (return)
February 5, 2017

9th grade physical science
the density
February 5, 2017

Science
as the stone travels upward, its kinetic energy becomes potential energy the potential at the top is equal to the kinetic at the bottom ... e = 1/2 m v^2 = m g h ... h = ?[v^2 / (2 g)]
February 5, 2017

Pre-Calculus
?[389^2 + (389 + 50)^2]
February 5, 2017

science
h = -1/2 g t^2 + 7 t + 55 h is zero when the bottle hits the ground 0 = -4.9 t^2 + 7 t + 55 you want the positive solution
February 5, 2017

Algebra2
30 * (54/42)^2 * (26/85)
February 4, 2017

physics
do they start timing at a crest? there are 19 wavelengths between 20 crests
February 4, 2017

Chemistry
K.E. = 1/2 m v^2 look up the mass of the electron (in kg), and solve for v
February 4, 2017

Math
f = t - 20 j = 2f = 2t - 40 p = 3j = 6t - 120 9t - 180 = 340 solve for t, then substitute back
February 3, 2017

Science
Elodea uses photosynthesis to convert carbon dioxide and water into oxygen and carbohydrate the most bubbles should be in the carbon dioxide enhanced sample the degassed sample should have no bubbles the oxygen enhanced sample should be somewhere in between
February 3, 2017

math
b = 20000 (1 + .07)^6
February 3, 2017

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