Friday

November 27, 2015
Total # Posts: 35,808

**Geometry**

It appears that the 3rd side is y, so yes, that means y + (y+10) + (y^2-2) = 21 y^2+2y+8 = 21 y^2+2y-13 = 0 now use the quadratic formula. If you want an integer or rational answer, there must be a typo somewhere.
*October 19, 2015*

**Simple interest math**

.053n = 1
*October 19, 2015*

**Science**

well, it increased by 40 km/hr in 9 s, so the acceleration is 40/9 km/(hr-s) Not the usual units, so let's make everything meters and seconds 40/9 km/hr-s * 1000m/km * 1hr/3600s = 1.234 m/s^2
*October 19, 2015*

**Algebra**

well, 8a+8b = 8(a+b)
*October 19, 2015*

**Math**

Nope (C) Do not change the direction of the inequality unless you multiply by a negative number.
*October 19, 2015*

**math**

x(20-x) = 0
*October 19, 2015*

**math**

√12 x √30 -√20 x √8 √360 - √160 √(36*10) - √(16*10) (6-4)√10 2√10
*October 19, 2015*

**algebra**

see related questions below.
*October 19, 2015*

**Steve look i have corrrected it help plz it urgent anyone plz**

Maybe you should consult someone local who can understand your garbled instructions. Like, oh, I don't know, someone who speaks your language?
*October 19, 2015*

**math**

since there is no question here, I have no idea how the answer was achieved, nor what it might mean.
*October 19, 2015*

**Algebra word problem.....so difficult**

Where do you get this stuff? No way the problem was presented in those words! I'll assume that "last three year" means "three years ago". "next nine years" means "nine years from now" We have three ages: m: me k: kemi f: femi We are ...
*October 19, 2015*

**Algebra**

I suspect the intent was (7/33)y = -56/3 y = (-56/3)(33/7) y = -88 and similarly for the other one.
*October 19, 2015*

**math**

12+4n/3=8 4n/3 = -4 4n = -12 n = -3
*October 19, 2015*

**algebra**

bye bye - if you have trouble working a problem, rather than just hoping someone will do your entire assignment, come on back and show how far you get. Then you will get some help. Stop whining and get to work.
*October 19, 2015*

**algebra**

here's one freebie (5v-4)/10 = 4 5v-4 = 40 5v = 44 v = 44/5
*October 19, 2015*

**Math**

calm down and just read the words, then change them to algebra: What does one more than six times the number of white beads mean? 6w+1 so, r = 6w+1 But I have no idea at all what you mean by Naomi and 50 red beads and white beats the number of red beads is one more than six ...
*October 19, 2015*

**trigonometery**

remember your double-angle formula? cos(2x) = 1 - 2sin^2(x) That means that cos(x) = 1 - 2sin^2(x/2) That should help.
*October 19, 2015*

**Math**

Looks good to me, if #2 means P∩V
*October 19, 2015*

**Area of a triangle plz help**

well, AN = AB-BN = 1.4 CN = √(3.2^2-1.4^2) = 2.88 the area is 1/2 AB*CN BM does not matter here.
*October 19, 2015*

**Algebra**

sounds entertaining. Why don't you post a picture of the poster you made? Oh, was there a question in there somewhere?
*October 19, 2015*

**MATHEMATICS**

As usual, draw some pictures showing how the sector rolls up to form a cone. since s = rθ, the circumference of the cone is 8*(8/9 π) = 64π/9 The radius of the sector is the slant height of the cone. The radius of the base of the cone is (64π/9)/2π = ...
*October 19, 2015*

**algebra**

well, just add up the costs: 125(7.5) + 300x = 1400(7.5+x) These must be special gold nuts, at those prices!!!
*October 19, 2015*

**maths**

If there were x,y,z 5p,20p, and 50p coins, respectively, then x = 2y y = 5z 5x+20y+50z = 200 Now just find x,y,z.
*October 19, 2015*

**Math**

well, since you want mi/hr, just divide the values, watching the units: (7.5 mi)/(1.5 hr) = (7.5/1.5) mi/hr = 5.0 mi/hr
*October 19, 2015*

**Math**

well, it is the same as sin x = ±1/√5 So, get the reference angle, and set it up in all four quadrants.
*October 19, 2015*

**maths**

clearly the daughter gets 1/6 of the total.
*October 19, 2015*

**college**

If the area of the water is A, and its depth is h, then V = 1/3 Ah But, due to the conical shape, r = kh, so V = kr^3 Taking derivatives, dV/dt = kr^2 dh/dt But, we are told that dV/dt = kA, so (dV/dt)/A = k = dh/dt So, dh/dt = k Note that all the k's used are different, ...
*October 19, 2015*

**math**

see khaled's post just below yours.
*October 19, 2015*

**differential**

x^2+y^2=10^2 y=6 when x=8 tanθ = y/x, so y = x tanθ tanθ=3/4 when x=8 x dx/dt + y dy/dt = 0 dy/dt = tanθ dx/dt + x sec^2θ dθ/dt Now just plug in your numbers.
*October 19, 2015*

**Maths**

no solution as written. Why is there a 10 on both sides?
*October 19, 2015*

**math**

I don't see any question, just an algebraic expression. However, on the off chance that you are interested in factoring, it's 3a(8x^2+6x-35) = 3a(4x-7)(2x+5)
*October 19, 2015*

**math**

26/130 = .20 = 20%
*October 19, 2015*

**Calculus**

v(t) = -5t^4 - 20t + 100 s(t) = -t^5 - 10t^2 + 100t + c you want c, so just plug in s(1)=50 and crank it out.
*October 19, 2015*

**physics**

well, the height of the bag is h(t) = 81.8 + 1.35t - 4.9t^2 so just solve for t when h=0.
*October 19, 2015*

**Algebra**

nope. B better review functions.
*October 19, 2015*

**math**

V = kBh B = V/kh Now you just find B' where B' = V'/kh' = (2V)/(k*h/2) = 4V/kh = 4B = 4*36 = 144
*October 19, 2015*

**Physics**

well, plugging your numbers into the equation of motion, y = .839x - 8.35x^2/v^2 so, plug in y(106) = 0 since the pitch and the fence are the same height. That will give v.
*October 18, 2015*

**math-polynomial**

correct. Or, (-(x-2))(-(x+2)) = (x-2)(x+2) = x^2-4 However, I think the point of the exercise was that since all powers of x are even, P(x) is an even function, so P(-x) = P(x).
*October 18, 2015*

**Mathematics**

x/(2.9-1.1) = cot 36.7°
*October 18, 2015*

**Pre Calculus**

well, you know that C = πd The questions should be easy to answer, knowing that. Make diagrams if things aren't clear just from the words.
*October 18, 2015*

**math**

d = j+3 (d-2) = 2(j-2) JR is 5 Daisy is 8
*October 18, 2015*

**algebra2**

infinite solutions. they are the same line.
*October 18, 2015*

**Math**

1,2,3 look good. #4 sinx = -1/√2 bzzzt.
*October 18, 2015*

**Math**

looks like it to me. cos^3x - cosx = 0 cosx (cosx-1)(cosx+1) = 0 Oops. Looks like you left out where cosx=0.
*October 18, 2015*

**PHYSICS**

well, F = GMm/r^2 So, plug in the numbers.
*October 18, 2015*

**barberton tvet ,science**

42 km
*October 18, 2015*

**wcccd**

p = k√L That is, p/√L = k is constant. So, you want to find p where 1.3/√2 = p/√7
*October 18, 2015*

**Chemistry**

figure the moles. 1 mole occupies 22.4L 1.15g O2 is 0.0359 moles O2 1.55g N2 is 0.0554 moles N2 A total of 0.091 moles * 22.4L/mole = 2.04 L
*October 18, 2015*

**Algebra**

1735.50(1.0925)^4
*October 18, 2015*

**Math**

Seems to me that L2 is just x = 1+2t y = -4+2t z = -3+2t If x=-4, t = -5/2 So, P=(-4,-9,-8)
*October 18, 2015*

**math**

An easy way to go from base8 to base16 is to use binary, first in groups of 3 and then in groups of 4 bits: 010 011 111 001.110 010 101 --> 0100 1111 1001.1100 1010 1000 = 4F9.CA7 The last digit depends on how you account for the missing bits at the end. If you're on a ...
*October 18, 2015*

**Geometry i need hlp urgently plz plz plz**

well, you know that (10-2)^2 + (y+3)^2 = 10^2 So, now you can easily find y (the ordinate)
*October 18, 2015*

**MATHS**

come on. Just read the words, and translate them into symbols. PINKY SPENT 3/5 OF HER MONEY ON A HAND BAG. that means that the remaining 2/5 was spent on the dress and belt. 2/5 is 2/3 of 3/5, so d+b = (2/3) h The other equations are also just restatements of the words in ...
*October 18, 2015*

**MATHS**

d = b+20 h = 2d d+b = (2/3)h now, find b,d,h and their sum is the total money to start with.
*October 18, 2015*

**Physics**

use the law of cosines. The distance z is found using z^2 = 330^2 + 160^2 - 2*330*160 cos 45° and the direction is θ (measured from due east) where tanθ = (160/√2)/(160/√2 - 330)
*October 18, 2015*

**Math**

also, note that x/2 = 5π/6. So, x = 5π/3. Watch the details, guy.
*October 18, 2015*

**Math**

nope. cos(x/2) has period 4π
*October 18, 2015*

**Math**

well, you know that cos π/6 = √3/2 So, with the negative value, you have x/2 = 5π/6 or 7π/6
*October 18, 2015*

**grammer**

or maybe ... provided pure prevarication on his personal performance.
*October 18, 2015*

**math homework**

just recall that a horizontal line has slope=0. So, you want y' = 4x^3-4 = 0
*October 18, 2015*

**Math Help**

dividing through by x^2, f(x) = 2 + 5/x - 7/x^2 f'(x) = -5/x^2 + 14/x^3 f'(-4) = -5/16 - 14/64 = -17/32
*October 18, 2015*

**Calculus i need help plz plz**

No calculus needed here, but Damon's exposition is clear. Let's see another easy way. The new value is (1.02w)(0.97s)^3/(1.01d)^4 = (1.02)(0.97^3)/(1.01^4) ws^3/d^4 = 0.8946 ws^3/d^4 = 0.8946y so, the y value has decreased by 10.54%
*October 18, 2015*

**Math**

clearly, with all the folks at work, it will take 222/556 minutes per bag. I suspect a typo in your number of bags.
*October 18, 2015*

**maths**

x/y = 10/7 y/z = 7/5 y = z+14
*October 18, 2015*

**gaya ,college science**

Hmmm. Maybe the question meant to ask about alkalis. Sodium is an alkali metal.
*October 18, 2015*

**trigonometry**

Recall that the principal values of arctan are -π/2 < x < π/2 tan^-1(tan(8)) = tan^-1(-6.79) = -1.42 tan^-1(tan(4)) = tan^-1(1.157) = 0.858
*October 18, 2015*

**math**

B = A x*(1.085^2 - 1) = (75000-x)(2*.08) Now just solve for x.
*October 18, 2015*

**HELP CALCULUS**

Just use the product and chain rules: arctan(4x^2y) = x + 3xy^2 1/(1+16x^4y^2) * (8xy+4x^2y') = 1 + 3y^2 + 6xyy' 8xy/(1+16x^4y^2) + 4x^2/(1+16x^4y^2) y' = 1+3y^2 + 6xyy' y'(4x^2/(1+16x^4y^2) - 6xy) = 1+3y^2 - 8xy/(1+16x^4y^2) At this point, it's just ...
*October 17, 2015*

**calculus**

y' = (y cosx)/(6+y^2) (6+y^2)/y dy = cosx dx 6lny + 1/2 y^2 = sinx + c y^2 + 12lny = 2sinx + c I don't see any way to express y explicitly as a function of x, using elementary functions.
*October 17, 2015*

**Algebra 2**

looks good to me.
*October 17, 2015*

**Algebra 2**

yup
*October 17, 2015*

**Math**

close. You forgot the first piece y = 40 when 0 <= x <= 500 y = 40+.05x when x > 500 I guess we can assume that negative minutes are to be disregarded as a possibility.
*October 17, 2015*

**algebra**

Assuming you meant g(x) = (5x^3 - 28x^2 - 48x)/(-8x+7) it's not a polynomial. The possible rational zeroes of the numerator include all the fractions whose numerator is a factor of 48 and whose denominator is 1 or 5. The only rational root of that is 0. Would you care to ...
*October 17, 2015*

**Algebra 2**

if the same value of x maps to more than one y, then the relation is not a function. So, check the pairs on each line. If more than one have the same 1st element, that relation is not a function.
*October 17, 2015*

**math**

actually, the length of the wire is 63.0/L = sin 45.5° the formula used by Collins gives the distance of the wire's anchor to the base of the pole.
*October 17, 2015*

**Math (sequence)**

The sequence is 1,2,3,5,8,13,21,... You already explained the logic. Each term is the sum of the two preceding terms.
*October 17, 2015*

**Calculus**

f(x) = x^3 - 2x^2 + x f'(x) = 3x^2 - 4x + 1 so, where is f' = 0?
*October 17, 2015*

**No Joy There**

I thought of that, but in that case, f(-3) ≠ f(-2), so the theorem does not apply.
*October 17, 2015*

**Calculus**

I dislike f(x). It is linear, so cannot satisfy the theorem.
*October 17, 2015*

**Calculus**

so, just do the math. Find c where f(2)-f(1) = f'(c) = 1.5 I think your function is bogus. No one would write f(x) like that.
*October 17, 2015*

**Calculus**

y(1) = ln(1)+1 = 0+1 = 1 y'(x) = 1/x so, y'(1) = 1 You want the line through (1,1) with slope 1.
*October 17, 2015*

**Calculus also need help plz plz plz**

∂z/∂x = -2x/(x^2+y^2-1)^2 ∂z/∂y = -2y/(x^2+y^2-1)^2 so, x ∂z/dx + y ∂z/dy = -2(x^2+y^2)/(x^2+y^2-1)^2 = -2z^2(1+z)
*October 17, 2015*

**Math**

really? 30 is 2 less than 32 35 is more than 40 - 6
*October 17, 2015*

**Calculus badly need help so difficult**

Assuming a typo so that the 3 %ages are in the order w,s,d: (1.02w)(0.97s)^3/(0.99d)^4 = (1.02*.97^3)/.99^4 ws^3d^4 = 0.9691 y So, y decreased by 3.09%
*October 17, 2015*

**chemistry**

sounds amazing! Oh, was there a question in there somewhere?
*October 17, 2015*

**Science**

42 cm/s
*October 17, 2015*

**Math**

There are 5^5 possible numbers There are only 5! ways to arrange the digits with no repeats. S, P = 5!/5^5
*October 17, 2015*

**logarithm**

log_2(x) = 1/log_x(2), so If log_2(x) = a and log_2(y) = b, we have 1/a + 1/b = 1/2 1/3 + 1/6 = 1/2 so, x=2^3 and y=2^6 so xy = 512
*October 17, 2015*

**Multi Cultural Psychology**

oh? and what would be the variable?
*October 17, 2015*

**maths**

If their ages are x and y, then we have x/y = 5/7 (x+4)/(y+4) = 3/4 Now just solve for x and y. It's easier if you get rid of the fractions first...
*October 17, 2015*

**math**

very few rules are Always True!
*October 17, 2015*

**MATH**

48/5 = ? 36/5 = ? Now subtract the product of those two numbers from 48*46
*October 17, 2015*

**math mtap**

How many 12x12 squares can fit in?
*October 17, 2015*

**calculus**

I interpret the somewhat garbled language as x^2 y" - 3xy' - 5y = sin(logx) well, the homogeneous equation has solution y = ax^5 + b/x Now apply the methods for the Euler equation to get the desired solution.
*October 17, 2015*

**M@them@tcs**

just use what you know about GPs: ar^3 = ar^2+72 ar^2 = ar+24 So, ar^2(r-1) = 72 ar(r-1) = 24 Now divide and you have r=3 So, a=4 and the GP is 4,12,36,108
*October 17, 2015*

**physics**

is going faster.
*October 17, 2015*

**maths**

Well, just read the words and use what you know about APs: a+2d = 5(a+5d) a+d = 2(a+3d)-3 Now you can find a and d and answer any other questions about the sequence.
*October 17, 2015*