Monday

February 8, 2016
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*