Monday
February 8, 2016

Posts by steve

Total # Posts: 37,469

Math
The above is gibberish. Why not post the question as it was given to you? The closest thing I can think of to your posting is Hora aderat briligi. Nunc et Slythia Tova Plurima gyrabant gymbolitare vabo; Et Borogovorum mimzebant undique formae, Momiferique omnes exgrabure Rathi.
December 3, 2015

Mathematics
assuming x-1 > 0, 4x+3 <= 2x-2 x <= -5/2 But we assumed x>1, so no joy there. If x-1 < 0, or x < 1, 4x+3 >= 2x-2 x >= -5/2 So, f(x) <=2 on the interval [-5/2,1) See this at http://www.wolframalpha.com/input/?i=%284x%2B3%29%2F%28x-1%29
December 3, 2015

Math
it will be 7/2 as big, since all the numbers to be added are 7/2 as big.
December 3, 2015

Math!
assuming the same f, f(t) = 6t-2 f(2) = 6*2-2 f(-3) = 6(-3)-2 and so on I am confused as to just what your question is. What's to solve?
December 3, 2015

PreCalculas check
as a quick check, go to wolframalpha.com and type in parabola 8x^2-20x-61/60 It will graph it and describe its properties. Same for the ellipse. As for #1, you must see that it cannot be a parabola. Not with both x^2 and y^2.
December 3, 2015

Pre calculus
yes - all polynomials have that domain. They are defined for any real number.
December 3, 2015

Pre calculus
D looks good to me.
December 3, 2015

Pre calculus
you know that √n must have n >= 0 SO, you need (6-x) >= 0 Now what do you think?
December 3, 2015

Maths
today
December 3, 2015

math 2 questions plz help asap
why do you keep guessing instead of thinking??? The front porch is a lot longer than a pencil. NY-CA is many many miles - clear across the country. I see a rough road ahead for you.
December 3, 2015

math 2 questions plz help asap
do you have any idea of the relative sizes of inches, feet, miles, etc.? Surely you cannot think a pencil is 12 feet long. That is over twice as tall as you are! #2 is correct. You must have some idea about #1, if you know what an inch is.
December 3, 2015

maths: Lowest common multiple
what is the smallest number which is a multiple of both 8 and 12? 8 = 2*2*2 12 = 2*2*3 so, an multiple of 8 must have 2 as a factor at least 3 times. Similarly, multiples of 12 have at least two 2's and one 3. So, pick the highest power of all the prime factors of each ...
December 3, 2015

Math
(a+4d)/(a+9d) = 1/2 a+11d = 36 Now you can find a and d.
December 3, 2015

Maths urgent
√2 + sin = cos cos - sin = √2 cos^2 - 2sin*cos + sin^2 = 2 -2sin*cos = 1 sin(2x) = -1/2 I guess you can take it from there, right? Watch out for spurious solutions (where cos-sin = -√2)
December 3, 2015

math
google is your friend. So is your textbook.
December 3, 2015

PreCalculas
#1. vertices indicate you have a vertical axis of symmetry. So, since the foci are evenly spaced from (0,0), y^2/a^2 - x^2/b^2 = 1 The vertices are at y = ±6, so y^2/36 - x^2/b^2 = 1 The asymptotes are y = ±(b/a)x, so b/a = 3/4, or b=8 see the info at http://www....
December 3, 2015

math
3cos35cosx-3sin35sinX = 3cos(x+35) So, now you have 3cos(x+35)-cosx = 0 Hmmm. not much help. So, back to basics. 6cosx+3cos35cosx-3sin35sinX=7cosx 3sin35 sinx = (1-3cos35) cosx Let c = (1-3cos35)/(3sin35) = -0.847 and you have sinx = c cosx sin^2x = c^2 cos^2c 1-cos^2x = c^2 ...
December 3, 2015

Maths
Looks good to me.
December 3, 2015

Math
no idea. It's just a ball; 5 inches or so? Google it to find the official dimensions of a tetherball. However, the circle has a radius of 6 ft.
December 3, 2015

Math
x + 2x-4 = 180
December 3, 2015

Maths
I see you have the sum of squares of 3 numbers. I hope that is what you intended.
December 3, 2015

Pre-Calculus
If you label the 4 points A,B,C,D then it is easy to find the lengths of the 4 sides. Now, the length of AC is 551. Now you have two triangles, and you know all the sides, so you can use Heron's formula to get the areas.
December 3, 2015

Algebra
#1. n/3 - 8 = -13 #2. ok #3. ok 1/4 = x/3 x = 3/4
December 2, 2015

Math
L = T+6 F = 2(L+T) F = 32 2(L+T) = 32 2(L+L-6) = 32 2L-6=16 L=11
December 2, 2015

calculus
Do you have the radius of the moon? Do you have the formula for the distance of the horizon from a height h? Do you have the gravitational acceleration g for the moon?
December 2, 2015

Calc 3
1st note that e^(2t)+4+4e^(-2t) = (e^t + 2e^-t)^2
December 2, 2015

precalculus
xy = 800 p = 2x+3y = 2x + 2400/x Now just find x for minimum p. This assumes two rectangular areas sharing a common fence of length y.
December 2, 2015

Math
yes.
December 2, 2015

Math
1B no. 36 ≠ 24*3 2D ok
December 2, 2015

College algebra
If Matt takes x hours, then Jena takes 3x 1/x + 1/3x = 1/9
December 2, 2015

Math
(110kg * 9.8m/s^2 * 0.3m)/(10s) = 32.3W
December 2, 2015

calculus
There are any number of calculators online to help you confirm your solution. One is here: http://www.emathhelp.net/calculators/calculus-2/trapezoidal-rule-calculator/
December 2, 2015

5th math
helps build strong bodies 12 ways!
December 2, 2015

math
12*10^6
December 2, 2015

functions-math
f(x) = 3250*(1/2)^(x/4)
December 2, 2015

Algebra
just collect like terms (same power) (-7y^2-4y+6) = (7y^2-4y-4)-(2y^2-2y-6) -7y^2-4y+6 = 7y^2-4y-4-2y^2+2y+6 -7y^2-4y+6 = 5y^2-2y+2 -12y^2-2y+4 = 0 Not sure what the equal sign is doing there. Simplifying an expression is not the same as solving an equation.
December 2, 2015

Precalculus
doesn't matter - they are the same. Use whichever one is easier for you to remember.
December 2, 2015

Math
5*5.75 + 2*7.00 = 42.75
December 2, 2015

precalc
#1 ambiguous #2 log(x(x-1)) = log 6 x(x-1) = 6 x = 3 #3 assuming base 4 throughout, log25-logx+log3-log7 = 1/2 log(75/7x) = 1/2 75/7x = 4^(1/2) = 2 14x = 75 x = 75/14 Unusual answer. I suspect a typo.
December 2, 2015

Pre Calc
as you know, all exponential functions y=e^x have y=0 as the horizontal asymptote. So, this is just shifted up by 3.
December 2, 2015

Algebra
If Stan has x, then Cory has 2x+24 add them up to get 150
December 2, 2015

Math
(b) has slope -5/-3 so nope. Take a look at (a)
December 2, 2015

Math
slope is change in y ----------------- change in x Moving from (-2,5) to (1,4) y changes by -1 x changes by 3 So, now you can get the slope. Hard to believe this was not clearly explained and demonstrated in your text. Or heck, remember that google is your friend. No need to ...
December 2, 2015

Algebra 2
since the sum of logs is the log of the product, you have log((a+2)(a-2)) = log(a^2-4) Here the base is 5, but the rule holds for any base.
December 2, 2015

Physics
conserve momentum: .86m = .63*61
December 2, 2015

Spga
If the height is h, then h cot45° - h cot60° = 10
December 2, 2015

math
20,000
December 2, 2015

Maths
this is not a PDE Does the ellipsis indicate more terms? That xy term should indicate a saddle point.
December 2, 2015

sunyani polytecnic
3x^2 = 6y x^2 = 2y x = √(2y)
December 2, 2015

Geometry
clearly, the quadrilateral consists of two triangles, each with a base if 28 cm. Their altitudes are 6.8 and 8.0 cm. I'm sure you know how to find the area of a triangle, given its base and height...
December 2, 2015

math
the last digit must be 0 or 5. The first digit cannot be 0. So, count the choices for each place, and multiply it out.
December 2, 2015

Mathematics 2
t+u = 6 10u+t = 3t Find t and u; the original number is 10t+u.
December 2, 2015

geometryproblems
One side is x The next side is 2/3 x The last side is x+2 x + 2x/3 + x+2 = 98 Find x, then the short side is 2/3 x.
December 2, 2015

Algebra
express all as the same power of 10. Then it will be easy to sort them.
December 2, 2015

solid mensuration
probably 1/9, but I have no diagram to consult.
December 1, 2015

Please help
20min = 1/3 hr, so 2mi/(1/3 hr) = 6mi/hr downstream 2mi/1hr = 2mi/hr upstream 2mi/(4mi/hr) = 1/2 hr It's not clear whether somewhere in all that you are to find Lisa's speed in still water, and the stream's speed...
December 1, 2015

math
(2m)^3 * 1000kg/m^3 = 8000kg
December 1, 2015

Pre-calculus
and lo! it is a mighty oak. Take some graph paper and plot the course. Recall that for each section x = d*cos(theta) y = d*sin(theta)
December 1, 2015

Pre Calc
as x -> -∞ e^(2x-1) -> 0 So, f(x) -> 3 You know what exponential curves look like. They all have y=0 as the asymptote. Then you can shift them up and down if you like. In this case, it is shifted up by 3.
December 1, 2015

Functions 11
multiply top and bottom on the left by (1-sinx) multiply both sides by 1+sinx.
December 1, 2015

Math
well 1 hour is 3 times as long as 1/3 hour, so it will water 3 times as much, right?
December 1, 2015

Math
(20 2/3)/(1 1/3) = (62/3)/(4/3) = 62/4 = 31/2
December 1, 2015

Algebra
204 = 17*12 2(17+12) = 58
December 1, 2015

trigonometry
7cos2θ = 6 cos2θ = 6/7 2θ = 31° or 329° θ = 15.5° or 164.5° since cos2θ has period 180°, add that to each of those values to get all solutions. Oops. You also need to convert to radians.
December 1, 2015

Chemistry
well, He and Ag are atoms, so no sharing there. So, now you have to choose between the other two. Are they ionic or covalent?
December 1, 2015

Algebra
geez. That's right out of the textbook: The line with slope m through the point (h,k) is y-k = m(x-h) So, plug in your numbers
December 1, 2015

Precalculus
or, for #1, just change the base to one you know log_5(14) = log14/log5 = 1.64 now you are already at 2x-9 = 1.64
December 1, 2015

algebra
3km/20min * 0.6mi/km = 0.09mi/min
December 1, 2015

algebra
C = πd A = πr^2 = π/4 d^2 just plug in your numbers
December 1, 2015

Math
d: multiply by 0.1 so, 380dm = 3.80m 1 cL = 1/100 L, so 1L = 100cL 1g = 1000mg, so 1mg = 0.001g
December 1, 2015

Algebra 1- Just one question please :)
low coefficient means the data do not cluster close to the line. So, not very confident.
December 1, 2015

alegbra 2
the reason we always set the polynomial to zero is that if the product of factors is zero, then at least one of the factors must be zero. So, we have 3 = 0 x-4 = 0 x+5 = 0 Now you can easily see which values of x will make 3(x-4)(x+5) = 0 The vertex of a parabola is at (w,k) ...
December 1, 2015

Math
let u = 3x^2-x-2. Then you have 2/u + 5/(u+1) = 7/(u-1) That gives you u = -1/6 Now all you have to do is solve 3x^2-x-2 = -1/6
December 1, 2015

maths
you need to raise the water by 4 cm. That would be a volume of 30x20x4 cm^3 But, the 4 cm of the block displace water, so you need to subtract 10x10x4 cm^3 from that total. Then convert cm^3 to liters.
December 1, 2015

math
If the half-life of carbon is n years, then (1/2)^(t/n) = 1/3 t/n log(1/2) = log(1/3) t/n = log3/log2 ≈ 1.58 so, about 1.58 half-lives
December 1, 2015

Mathematics
in 2 hours, the 1st train has covered 60 km. the 2nd train goes 15km/hr faster, so it will take 60/15 = 4 hours to make up the distance.
December 1, 2015

east salisbury
6 * 1/2, naturally.
December 1, 2015

algebra
try proofreading your problem.
December 1, 2015

Hinigaran, math
144/8 = 18, so the numbers are 18:72:90:144
December 1, 2015

geometry help plsss
well heck - just draw line XY so that it has a small bit on one side of AB and a long bit on the other side. XY is the perpendicular bisector of AB, not necessarily the other way around.
November 30, 2015

math
well 69 is 1 std above the mean.
November 30, 2015

math
56 is 1 std below the mean
November 30, 2015

math
well, how many std's between 33 and 42?
November 30, 2015

math
product of g and h: gh 10 times the product of g and h: 10gh
November 30, 2015

math
well, just plug in the value of x: 40.50 * 5 = ?
November 30, 2015

Trigonometry
b^2 = 44^2-40^2 same for the other problem. Remember that if the two legs are a and b, and the hypotenuse is c, a^2 + b^2 = c^2
November 30, 2015

Math
da/dt = 8πr dr/dt If da/dt = dr/dt, then r = 1/8π so, now you can find the area and volume.
November 30, 2015

math
If x gallons are drained, then 30% of what remains is antifreeze. So, since water is 0% antifreeze, .3(5-x) + 0x = .09*5
November 30, 2015

math
If the length is x, then the width is 2/3 x. So, the area is 2/3 x^2 = 864 x = 36 Now you know the doll house is 24x36 inches Divide those by 4 to get the drawing's dimensions.
November 30, 2015

Math
-16t^2 + 48t + 8 = 0 first factor out a -8, and you have 2t^2 - 6t - 1 = 0 1.5 is not a root of that quadratic.
November 30, 2015

math
note that 63 is 1 std above the mean, and 71 is 2 std above the mean.
November 30, 2015

math
sorry; XY=2.5, not YZ
November 30, 2015

math
The distance YZ is 3.8-1.3 = 2.5 Y is 5/12 of the way from X to Z. So, YZ is 7/5 as big as XY So, Z = 3.8 + (7/5)(2.5) = 7.3
November 30, 2015

Geometry
points A and B lines SR and ST
November 30, 2015

PreCalculus
start with the 1st term (recall that x^0 = 1) Then to get each next term, just keep multiplying by 0.1
November 30, 2015

Math
1/5 + 2/7 + x = 9/10 Hint: common denominator is 70
November 30, 2015

Physics
just find t where (1/2)^(t/22) = 1/9 The value of A0 does not matter, as it will be on both sides of the equation. (t/22) log(1/2) = log(1/9) Now just churn the numbers.
November 30, 2015

Precalc
log 5n = 3 assuming base 10 logs, 5n = 10^3 = 1000 n = 200 log y = 1/3 log(40/5) + 2/3 log 27 + log 11 since 8 = 2^3 and 27 = 3^3, that is log y = log 2 + 2 log 3 + log 11 log y = log(2*9*11) y = 2*9*11
November 30, 2015

science
how about limestone? Calcium carbonate has carbon in it.
November 30, 2015

Algebra
75+42x = 30+45x
November 30, 2015

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