Thursday
March 30, 2017

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Posts by Scott

Total # Posts: 2,027

math
FOIL the two binomials
March 29, 2017

MATH URGENT HELP!
4% means 1% per quarter (compounding period) 10 yr is 40 quarters A = 5000 (1 + .01)^40
March 29, 2017

Algebra 2
180º is the negative x direction x = -12.5 , y = 0 (12.5,0)
March 29, 2017

Science
the trains are closing at 100 kph ... so it takes them 1 hr to pass the plane flies 90 kph for 1 hr
March 29, 2017

Algebra
should be .94 in last eqn...not .96
March 29, 2017

Algebra
10000 (1 + .08)^t = 33000 (1 - .06)^t log(10) + t log(1.08) = ... log(33) + t log(.94) t [log(1.08) - log(.94)] = ... log(33) - log(10) t = log(33 / 10) / log(1.08 / .96)
March 29, 2017

Physics
work is energy your work is correct you might have dropped a digit in the W equation not sure why you don't think you get it...
March 29, 2017

Math
A is a fixed value the other three vary statistically
March 29, 2017

Math
those lines around the numbers are absolute value symbols that means only positive numbers |-n| = n
March 29, 2017

Math
yup
March 29, 2017

Math
x / y = 3 / 4 4 x = 3 y
March 29, 2017

Math
$420 is 30% ... you want 3% your answer is ten times what it should be
March 29, 2017

Math
you're very generous that's a 30% commission
March 29, 2017

MA240 Please help
good answer
March 29, 2017

Math
(40 * 18) - 320 check again
March 29, 2017

Chemistry
a cubic decimeter (dm^3) is a liter not sure what the question is...
March 29, 2017

Physics
force * distance / time
March 29, 2017

physics
specific heat * mass * temp change
March 29, 2017

Science
not tellin' ya the answer but you need to keep thinking
March 28, 2017

MATH
5/12 (9000 + m) = 250 + m 45000 + 5 m = 3000 + 12 m
March 28, 2017

Mathematics
might want to check A the others look good
March 28, 2017

chemistry
100% * (1/2)^(120 / 4.55)
March 28, 2017

ALGEBRA
the "graphing form" is the vertex form f(x) = a (x - h)^2 + k ... a = 1 in this case vertex is (h,k)
March 28, 2017

Physics
momentum is conserved 65 kg * 2 m/s = 55 kg * v the canoe moves in the opposite direction
March 27, 2017

Physics
the index of the solution must be approximately the index of the material there is no refractive boundary between the material and the solution, so the material seems invisible
March 27, 2017

Pre calc
the height of the observer is ... h = 375 sin(25º) the height of the tower above the observer is ... h = 375 sin(39º) add the two heights to find the tower (remember to round)
March 27, 2017

pre calc
exact answer is given in "related questions" at bottom of page
March 27, 2017

Algebra
they each paint a fraction of the house ... the fractions add to one t / 10 + t / 15 = 1 3t / 30 + 2t / 30 = 1 5 t = 30
March 27, 2017

precalc
a) u - v b) u - 2 v c) 2 u + 4 v
March 27, 2017

Maths
c = 4 h 2 (c - 280) = h c = 8 (c - 280) solve for c, then substitute back to find h
March 27, 2017

Preclc
use the Law of Sines to find the distance from one of the people to the spot then use trig to find the height of the spot the angle at the spot is ... 180º - 75º - 45º = 60º 600 m / sin(60º) = x / sin(45º) ... x is the distance from the observer ...
March 27, 2017

Physics
"acquires" is an interesting term the muscle energy on the ground (like a spring), becomes gravitational potential energy during the jump it appears you have correctly calculated the height
March 26, 2017

Physics
looks actually correct to me
March 26, 2017

pre calc
because i made a typo...
March 26, 2017

pre calc
use the Law of Sines the angle at the ship is ... 180º - 46º - 63º 283 ft / sin(43º) = 350 ft / sin(63º) ... = x / sin(180º - 46º - 63º)
March 26, 2017

algebra
to save money with B ... A > B .2 m + 40 > .12 m + 56.32 .2 m > .12 m + 16.32 .08 m > 16.32 m > 204
March 26, 2017

Precalculus
the plane flew 360 mi east in the air but the air moved east and north ... this is the wind speed 15 mi E and 20 mi N forms a 3-4-5 triangle the wind is ... 25 mi / 2 hr ... on a bearing N of E the tangent of the bearing angle is ... 20 / 15
March 26, 2017

math
twice the teeth means half the revolutions teeth * speed = k = 48 * 3 = 144 96 * s = 144 ... s = 144 / 98
March 26, 2017

physics
nope E friction from the tires and normal force from the banking
March 26, 2017

Math
looks like a glass/class typo 2/3 of 30.9 kg 2 * 30.9/3 = ?
March 26, 2017

Pre calc DUE TOMRROW
i mis-transposed the 43º ... it should be 46º
March 26, 2017

Pre calc DUE TOMRROW
use the Law of Sines the angle at the ship is ... 180º - 46º - 63º 283 ft / sin(43º) = 350 ft / sin(63º) ... = x / sin(180º - 46º - 63º)
March 26, 2017

geometry
use ... a^2 + b^2 = c^2 ... twice
March 23, 2017

Pre-cac
the max is on the axis of symmetry x = 3 / 2a 15 = a (3 / 2a)^2 - 3 (3 / 2a) + 5 10 = (9 / 4a) - (9 / 2a) 10 a = 9/4 - 9/2 = - 9/4 a = -9/40
March 23, 2017

physics
google "uniform circular motion" look at the diagrams on wikipedia
March 23, 2017

Math
time = distance / velocity
March 22, 2017

Math
the peak of the jump lies on the axis of symmetry of the parabola ... x = -b / 2a = -21 / (2 * -16) time up equals time down time of flight (jump) = 2 * 21/32
March 22, 2017

Chem: please help
new conc = old conc * 15/50
March 22, 2017

Chemistry help!!
new conc = old conc * 15/50
March 22, 2017

math
? * (5/2)^2 * (8/2) * 10^6
March 22, 2017

Chemistry
i think you're right
March 22, 2017

Maths
2 (x^3 + 6^3) the sum of cubes is a standard factoring
March 22, 2017

math
the area for the measurements you give is not listed see "Heron's Formula"
March 22, 2017

Math1
100 (1 + .04)^12
March 22, 2017

math
.08 f + .05 s = 1330 .12 f + .02 s = 1500 solve the system using elimination or substitution
March 22, 2017

Calculus
integrate the derivatives Y"=6 ... y' = 6 x + c ... 4 = 6 * 1 + c ... c = -2 y' = 6 x - 2 ... y = 3 x^2 - 2 x + c ... 6 = 3 - 2 + c ... c = 5 y(x) = 3 x^2 - 2 x + 5
March 22, 2017

physics
a = v / t d = 1/2 a t^2
March 22, 2017

physics/maths help damon or steve or scott
6 V0 + 18 a = 246 V0 + 9 a = V1 3 V1 + 4.5 a = 69 subs ... 3 V0 + 27 a + 4.5 a = 69 ... times 2 ... 6 V0 + 63 a = 138 subtract to eliminate V0 ... 45 a = -108 ... a = -2.4 substitute back to find V0
March 22, 2017

Physics
the time of flight is the time it takes for the car to fall the difference in elevation of the two sides 21.3 - 1.8 = 1/2 * 9.8 * t^2 find t the car has to travel 61 m in time t the car's horizontal velocity is constant its vertical velocity increases due to falling ... Vv...
March 22, 2017

Physics
the energy is proportional to the SQUARE of the compression 4^2 = ?
March 22, 2017

Math
multiply the percentage (as a decimal) by the total number of students (500) to find out the numbers for the various sports then subtract the basketball number from the football number
March 21, 2017

Math
the built in Windows calculator (in scientific mode) works pretty well
March 21, 2017

Math
there are 365 compounding periods per year [1 + (.03 / 365)]^365 = 1 + APY
March 21, 2017

chem
the pressure is proportional to the absolute (Kelvin) temperature 1.89 / (24.0 + 273) = p / (38.0 + 273)
March 21, 2017

SCIENCE
for EQUAL branches total r = branch r / # of branches
March 21, 2017

Math
5.00 + (0.65 * x) = 10.00 + (0.45 * x) .20 x = 5.00
March 20, 2017

Physicd
7 N?s - 5 N?s = 2 N?s m v = 2 N?s m = 2/5 kg
March 20, 2017

Algebra
the slope means that the candle shortens by .4 cm per hour of burning how much taller would it be nine hours earlier? (how much did it shrink in nine hours?)
March 20, 2017

math
s + c = 72 / 3 s - c = 72 / 4 add the equations (to eliminate c) solve for s substitute back to find c
March 19, 2017

math
m?CAB = m?CBA = 30º m?BCM = 90º BM = 24 ... 30-60-90 TRIANGLE AM = CM
March 19, 2017

science
RL and LR are brown eyed but carry the blue recessive they represent half of the population
March 18, 2017

math
there are two "integer" multiples of 2 A 0.25 = 2^-2 B .05 = 2^-1
March 16, 2017

Maths
each component has an 80% chance of being good so the probability of a good (not defective) product is ... .8^4 probability of a defective product is ... 1 - .8^4
March 16, 2017

Physical Science
pH + pOH = 14 pOH = 12 [OH] = 10^-12
March 15, 2017

Pre-cal
s = 2 f - 5 s + f^2 = 115 f^2 + 2 f - 5 = 115 f^2 + 2 f - 120 = 0 (f + 12)(f - 10) = 0 f - 10 = 0 ... f = 10
March 15, 2017

Math
did you see the two sig fig part? 210000
March 15, 2017

SCIENCE
think you're right
March 15, 2017

Maths
the 8th term is 5 differences from the 3rd term, and 7 differences from the 1st term e = 2 t = 2 (f + 2 d) f + 7 d = 2 f + 4 d ... 3 d = f sum8 = 8 f + 28 d = 39 substituting ... 24 d + 28 d = 39 ... 52 d = 39 ... d = 3/4 substitute back to find f
March 15, 2017

math
there are 36 inches in a yard 580 / 36 = ?
March 15, 2017

11 grade / physics
Vv = V sin(30º) = ?(2 g h) Vh = V cos(30º) = Vv / tan(30º)
March 15, 2017

Chemistry
for the given volumes (22.5 + 22.5) * (30.17 - 23.50) * 1.00 ... * 4.184
March 15, 2017

Chemistry 11
looks fine
March 15, 2017

Math
the area is the average of the bases, multiplied by the height divide the area by 12 to find the number of boxes needed remember to round up to the next WHOLE number, if necessary
March 14, 2017

Chemistry
temp change times mass of H2O times specific heat of H2O (37.8 - 21.6) * 100 * 4.179 remember sig fig
March 14, 2017

Physics
momentum is conserved Mb * Vi = (Mb + Mw) * Vf Vi = (.005 + 8) * 0.50 / .005
March 14, 2017

Physics
frictional force is the normal force multiplied by the coefficient in this case ... Ff = Ma * g * 0.25 the frictional force keeps A moving with B ... so the max acceleration (without slip) is ... Ma / Ff the max force is the max acceleration multiplied by the sum of the masses...
March 12, 2017

Physics
1/2 m (v sin(60º)^2 = m g 10 km v = ?(g * 20 km) / sin(60º) this is the minimum velocity for the projectile to reach the height of the plane ... faster would be better
March 12, 2017

Physics
the weight change in the kerosene is the weight of kerosene displaced by the solid if the solid were kerosene, its weight would be 1.6 g ... (4.8 - 3.2) so the density ratio is ... 4.8 / 1.6
March 12, 2017

Chemistry
in (a) and (b), the hydroxides are probably in solution and the hydrogen is evolved as a gas
March 11, 2017

pre calc
the full solution is in the related questions at the bottom of the page
March 11, 2017

pre calc
the two given population numbers only have one significant digit either 670000 or 700000 is what the computer is looking for
March 11, 2017

Chemistry
the drops happen, but are not counted the fewer the drops to the endpoint, the lower the concentration of the unknown the concentration would appear to be lower than it actually is
March 11, 2017

physics!
velocity = circumference / period v = (2 * ? * 11.30 m) / 16.60 s plug it in and crank the crank
March 11, 2017

pre calc
1.7 = e^0.01t ln(1.7) = 0.01 t 100 ln(1.7) = t
March 11, 2017

Math
(300 * 200) - (280 * 180)
March 11, 2017

Physics
the centripetal acceleration is ... v^2 / r a) v^2 / r = g ... v^2 = 500 m * 9.8 m/s^2 b) his weight will be twice normal ... w = 2 * 80 * g
March 11, 2017

physics
95 km/h = 26.4 m/s 26.4 / 4.2 = stopping time (26.4 + 0) / 2 = ave stopping speed
March 10, 2017

Math
y varies inversely with x ... x y = k 25 * 5 = 125 ... x y = 125
March 10, 2017

math
the solution is the intersection of the lines
March 10, 2017

Physics
f = 1 / cycle time = 1 / (34.8 / 15)
March 10, 2017

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