# Posts by Scott

Total # Posts: 3,362

Algebra
times 1000 n ... 4234.3434... times 10 n ... 42.3434... subtract to cancel decimals 990 n = 4192 ... n = 4192/990 reduce the fraction

science
parallel means 0.2V across 2.0? current = voltage / resistance

Physics
1/2 m v^2 + m g h = 1/2 m V^2 1/2 m 72^2 + m 9.8 35 = 1/2 m V^2 72^2 + (9.8 * 70) = V^2

math
f = 1st mech , s = 2nd mech 10 f + 5 s = 1525 f + s = 200 solve the system using substitution or elimination

Physics
momentum is conserved total momentum = sedan + convertible (1200 + 1000) 16 = ... (1200 * 10) + 1000 v

Math
fill A fill C from A pour A into B ... one portion pour C into pail fill A fill C from A ... one portion in A pour C into pail ... one portion in pail

Math
16 oz per lb 1 3/4 lb for \$2.24 2.24 / (7/4) = ?

math

Math
good to know that your calculator works

physics2 lab
using 4 cm^3 the density is ... 50g / 4 cm^3 ... 12.5 g/cm^3 this is between lead (11.3 g/cm^3) ... and gold (19.3 g/cm^3) gold plated lead is a good guess G = fraction gold 19.3 G + 11.3 (1 - G) = 12.5

physics As
the rider/bike was already moving at X (like driving off a cliff) so the Ek gain from the Ep loss is added to the initial Ek of the rider/bike

Algebra
you calculated 1% growth instead of 10% 2100 * 1.1^6

Physics
momentum is conserved 85.0 * 2.56 = 375 * v

Alegebra
2/5 x + 1/5 x + 4/15 x + 50 = x

Algebra

math
[4 * 2 (160 + 90)] / 1000

calculus homework help stuck
a(t) is the 2nd derivative of s(t) v(t) is the 1st derivative of s(t) take the anti-derivative of a(t) ... this is v(t) + C ... don't forget the unknown constant take the anti-derivative of v(t) ... this is s(t) + Ct + D ... don't forget the unknown constants use the ...

Math & a bit of Physics
forces on the block are ... friction (F) ... opposing motion up or down ... gravity (G) ... downward along plane ... X force ... upward along plane gravitational force perpendicular to the plane is part of the frictional force G = F + 2X G + F = 9X you already have G as 110 ...

Maths
half the radius means a quarter of the area 3/4 of the larger circle is outside the smaller circle

Math
a vertical dashed line through -2 on the x-axis region to the left is shaded

Math
2 * ? * 6 cm * 35/60

math
L = 2B 5(2L + 2B) = 210 ... L + B = 21 2B + B = 21 solve for B, then find L and the volume

physics
s.g. ring (r) ... 7.35 / (7.35 - 6.85) 3.5 d + 17.5 g = 7.35E-3 r d + g = 7.35E-3 solve the system for d and g

math
distance^2 = (41 + 15)^2 + 23^2

geometric progression
seven steps and 56 powers of x ... so 8 powers per step t = -4 + 8

Math
3h + d = 18 2h + 4d = 22 solve the system by elimination or substitution

Math
find the distances between the points (all three, two at a time) if the distances satisfy .... a^2 + b^2 = c^2 ... then it is a right triangle

Physics
{[(19.8 + 4.30) / 2] * 5.2} / ?

Physics
angular momentum is conserved the momentum lost by the disc is transferred to the cylinder

MATH
6 (7 + 4)

Probability
p(not pass B, C, D) = 1/4 * 1/6 * 1/3 = 1/72 p(not pass B, C) = 1/4 * 1/6 = 1/24 = 3/72 p(not pass B, D) = 1/4 * 1/3 = 1/12 = 6/72 p(not pass C, D) = 1/6 * 1/3 = 1/18 = 4/72 p(pass at least two) = 1 - 14/72 = 58/72 p(qualify) = 4/5 * 58/72

Match
f(x) = y the points are ... (-1,-6) and (4,-14) find the slope then use point-slope to write the equation

AP Physics
1/2 m v^2 = m g h v^2 = 2 g h = 2 * 9.8 * 3.8 sin(23º)

Science
0 = -1/2 g t^2 + 10.1 t^2 = 10.1 / 4.9 v = 8.5 / t

Algebra 1
you have a point, and you know the slope y - 5 = -4 (x - 1) = -4x + 4 y = -4x + 9 maybe you missed a sign when you distributed the -4

Calculus
bases are arranged in a square, 90 ft on a side f = home to 1st , s = distance from 1st distance to home plate (p) ... p^2 = f^2 + s^2 = 90^2 + 60^2 2 p dp/dt = 2 s ds/dt dp/dt = (s / p) ds/dt

algebra
d = difference in ages 21 + d = 2 (21 - d)

Algebra I
just multiply it out the units for the answer are Joules

math
-8 ? 1.6 m ... -5 ? m

math
oops ... missed the hemi

math
surface of a sphere ... 4 ? r^2 approx 9000 m^2 10000 cm^2 in a m^2

Mathematics
2 + 3 + 5 = 10 2/10 s = 600

Math
for one ... 20 ? / 12 multiply to get five and thirty

math
the two shortest sides must sum to GREATER THAN the longest side in order for the triangle to "close up"

f(x) = |x| is a big "V" with the vertex at the origin adding 3 to x shifts the "V" 3 units to the left the leading minus sign inverts the "V" the minus 2 shifts the graph 2 units down

APY-math
e^(rt) = e^(.031 * 1)

Physics
initial KE ... 1/2 * .4 * .7^2 momentum is conserved ... .4 * .7 = (.4 + .5) * v solve for v final KE ... 1/2 * (.4 + .5) * v^2

Math
he sells 153 cards out of 765 what fraction (percent) of his cards did he sell

Algebra
[(91.2 - 24) / 24] * 100%

Calculus
missing a decimal point ... pH = 6.4 pH is the negative log of the H+ ion concentration yolk ... log[H+]= -6.4 more alkaline means more negative [H+] ... fewer H+ ions white ... log([H+] / 63) = log[H+] - log(63) ... change the sign for the pH

math
never heard of logarithms? there is a log key on calculators

math
log(400/106.7236) = x log(1.0124)

math

math
90 ft is one quarter of the actual field length ... 90/360 = 1/4 so multiply all of the actual dimensions by 1/4 to find the scaled dimensions

Math
\$3 to get in the cab (zero miles) ... y-intercept \$0.50 per mile ... slope x-axis is the independent variable ... miles y-axis is the dependent variable ... price is dependent on milage b. cost = \$.50 (miles) + \$3

Math
\$3 to get in the cab (zero miles) ... y-intercept \$0.50 per mile ... slope x-axis is the independent variable ... miles y-axis is the dependent variable ... price is dependent on milage

Physical Science
looks good

Math/calculus
sin^2 + cos^2 = 1 (sin^2 + cos^2)(sin^2 - cos^2) = sin^4 - cos^4 cos^2 - sin^2 = -(sin^2 - cos^2) simplifies to -1

physica
velocity = acceleration * time

Physics
the spring constant is a physical characteristic of the spring ... material, shape, length, etc. the different gravities of the moon and sun won't change the constant

Physics
the potential energy is 10 times as much ... PE = m g h the kinetic energy is also 10 times, but velocity is squared in KE 10 times KE means ?10 times velocity

Math
69/120 - 44/120 = 25/120 answer not given

geometry
using an online triangle calculator acute scalene

AP Chemistry
for a given mass, the temperature and pressure affect the volume ... p v = n r t but the volume is given here

AP Chemistry
you might be over thinking... they give the mass and the volume

Math
is -16 legit? ... 2 * 2 * 2 * -2

Math
1. 1st plus 2nd ... 3x = 3 twice the 1st plus 3rd ... 3x + z = 13 2. 1st minus 2nd plus 3rd ... 2x = 2

math
if e = 50 cm , then the block is ... 5e x 3e x 4e 60 e^3

Algebra II
google "sum of cubes" x^3 + 2^3

Science 9
food is chemicals energy (chemical) comes from digestion and processing

Maths / physics

maths
the difference (d) is -3 so the 12th term is ... 8 + 11(-3) = -25 the 1st and last terms (just like all the other "pairs") sum to -17 6 * -17 = ?

Physics
momentum is conserved momentum lost by the blue ball is acquired by the red ball

Algebra I
looks good

Math
the orthocenter is where the 3 altitudes of the triangle intersect find the equation of an altitude by using point-slope ... the point is the vertex (A, B, or C) ... the slope is the perpendicular to the opposite side (negative-reciprocal)

Math Help
equation implies an equal sign ab is just an expression ... two quantities multiplied together

Math Pratcice
the 3 ounces of cheese contain 10.5 grams of saturated fat ... 3 * 3.5 the cheese in the sandwich has a total of 18 grams of fat ... 10.5 of which is saturated ... this leaves 7.5 grams of unsaturated fat 3 ounces of cheese with 7.5 grams of unsaturated fat ... 2.5 grams per ...

Pre Algebra
the spoke is about the length of the radius of the wheel the diameter is twice the radius

Maths
r = red , b = blue , t = total = r + b r = b + 4 ... b = r - 4 ... t = 2b + 4 = 2r - 4 4 possible outcomes ... r+r , b+b , r+b , b+r p(r+b) = p(b+r) = (r*b) / t^2 2 [r(r-4)] / (2r - 4)^2 = 21/50 100 r^2 - 400r = 84 r^2 - 336r + 336 16 r^2 - 64r - 336 = 0 = r^2 - 4r - 21 ... 0...

Science
i think you're right hint : gamma is electromagnetic (not particle)

Physics 1
the range of a projectile is ... (launch vel)^2 * sin(2 * launch angle) / g 80.4 = v^2 * sin(2 * 48º) / 9.8

Chemistry
electrical conductivity is certainly good for a wire so is being able to form into long skinny shapes (ductility)

math
direct ... y = k x ... y1 / x1 = y2 / x2 ... y1 / y2 = x1 / x2 indirect ... x y = k ... x1 y1 = x2 y2 ... x1 / x2 = y2 / y1 ... a proportion will work ... but it's different than direct ... it is "inverted"

Geometry
B is the common point for the given segments if the segments are in opposite directions from B ... then, AC = AB + BC if the segments are in the same direction from B ... then , AC = BC - AB

math
looks good

physics
m g h = 1/2 m v^2 v = ?(2 g h)

solved see Peter @ 7:34 pm

Physics/Math
find the flight time ... 0 = -16 t^2 + 3.05 break shot speed ... 12.25 ft / flight time (impact speed)^2 = ... (break shot speed)^2 + (t * 32 ft/s^2)^2

Physics
the gravitational attraction equals ... the centripetal force G M m / r^2 = m v^2 / r M = v^2 r / G

Math
maybe the simplification they are looking for is ... 39 = 40 - 1 5 * (40 - 1) = 200 - 5 ... easy numbers...

Math
each change of one in x , results in a change of six in f(x) ... this would be the slope of a line so, f(x) = 6x + ? ... something is added to all the 6x's ... this would be the intercept of a line

math
ln(17) = .025 x

angular momentum of the moon is ... mass * velocity * orbital radius orbital radius is earth-moon distance ... 385000 km ... (time averaged) velocity (average) ... 1022 m/s mass ... 7.342E22 kg values courtesy of wikipedia

Math
b = number of books , p = orig price b p = 55000 (b - 25)(p + 15) = 63000 ... bp + 15b - 25p - 375 = 63000 ... 15b - 25p = 8375 ... 3b - 5p = 1675 ... 3b = 5p + 1675 3 b p = 165000 ... 5 p^2 + 1675 p = 165000 use quadratic formula to find p substitute back to find b

Math
a) (10 / x) + [10 / (x-2)] = 1 10x - 20 + 10x = x^2 - 2x 0 = x^2 - 22x + 20 use quadratic equation to find x b) (t / x) + [t / (x-2)] + [t / (x+2)] = 1

Geometry
looks good

MATH
2 ... TWO ... points for each correct answer

graphing
make a table x is 0 thru 12 y is dependent on x (use your equation)

MATH PLZ HELP
the mileage is spurious information ... intended to mislead Jerry is going to work for x weeks at 120 per week ... then add that money to the \$630 he already has to make up the selling price