Sunday

October 4, 2015
Total # Posts: 34,247

**Precalc**

surely you have some ideas about these. #6 is cos,sec #1,#5 are the same functions
*September 22, 2015*

**Algebra**

If A and C are x, then B = x/5. So .02x + .10(x/5) + .16x = 1.00
*September 22, 2015*

**Algebra**

If x at 20%, then .20x + .05(10-x) = .14(10)
*September 22, 2015*

**Algebra**

well, set them equal: 40.74x + 742.65 = 47.93x + 725 Now just find x and add 1995.
*September 22, 2015*

**Math**

the area increases by a factor or (5/2)^2 So, just plug in the new numbers.
*September 22, 2015*

**physics**

v = √(2as) so, just plug in the numbers
*September 22, 2015*

**math**

(38 3/4)/(3 7/8) = 10
*September 22, 2015*

**Math**

hmmm. By this time you should certainly know how to plug in a number. x: -0.1 cos(3*(-0.1)-1)/(3*(-0.1)) = cos(-1.03)/(-.03) = -17.16 I assume you can use a calculator, or google, or wolframalpha.com
*September 22, 2015*

**Physics**

I'll assume you mean m/s, not s/m. Combined speed is 5.12 m/s, so they meet at 3.5 * 2.13/5.12 meters from where the red car started.
*September 22, 2015*

**Chem (HELP!!)**

visit http://www.onlineconversion.com/ Or use the conversion tables you surely have access to.
*September 22, 2015*

**Chem**

There are always several basic conversion units. For example, convert 1.745 * 10^-5 m^3 to pints. 1 gallon = 231 in^3 1 in = 2.54 cm so, just start converting, making sure the units cancel correctly: 1.745*10^-5 m^3 * (100cm/m)^3 * (1in/2.54cm)^3 * 1gal/231in^3 * 8pt/gal = 0....
*September 22, 2015*

**Chem**

google can do these, or visit http://www.onlineconversion.com/
*September 22, 2015*

**Algebra I**

an undefined slope means a vertical line, of the form x=h Since the line passes through (-2,5), the equation is x = -2 This is a trick question, since there is no y-intercept.
*September 22, 2015*

**Computer/Math**

do you mean you got syntax errors, or the results were wrong? If your typing was as good there as it is here, I'm not surprised.
*September 22, 2015*

**Math**

I say it's bogus. The two are not equivalent. Try plugging in some actual numbers. I suspect a typo. Or a garbled posting. associative would be like a(bc) = (ab)c
*September 22, 2015*

**MATH/GEOMETRY**

blah blah blah apparently <1 and <2 form a straight line, which is 180° so, m<1 = 180-34 = 146°
*September 22, 2015*

**Trigonometry**

recall that cosine = x/r And, r^2 = x^2+y^2
*September 22, 2015*

**MATH/GEOMETRY**

instead of repeating the cry for help, why not look at your previous post, where I ask for more data? You provide no information about the relationship between the angles, yet you expect us to guess a value for <1? Stop whining and read your useless post!
*September 22, 2015*

**Algebra**

Oddly enough, it is C It should technically be (-7)x(-7)x(-7)x(-7)x(-7) But if you change the sign on two of them, the answer is the same, because (-7)x(-7) = 7x7
*September 22, 2015*

**Algebra**

#10 .57 = 57/100
*September 22, 2015*

**Algebra**

#1 Nope. 5/6 + 2/3 = 5/6 + 4/6 = 9/6 #2 ok #3 Nope. 9 is a perfect square. #4 Nope. Suppose x = 1/6. You have 1x/2x #5 ok #6 ok #7 ok #8 Nope. A has too many -7's #9 What's the difficulty? Just use the values given: 2s³-4r² if r=1 and s=5 2*5³-4*1² ...
*September 22, 2015*

**Maths**

y^2 + 2.5^2 = 6^2
*September 22, 2015*

**MATH/GEOMETRY**

You need to provide a little more information about the diagram. Surely you can see that with just the measure of <2, there is no way to guess anything about <1.
*September 22, 2015*

**Programming**

sheesh. read name,cabin,years print name,cabin,years if years < 2, print "Newlywed Gift" if years >= 40, print "Deluxe Anniversary Package"
*September 22, 2015*

**Calculus 3**

since F is conservative, the work is independent of the path, so it is ∫[(1,-2,1),(0,-7,5)] 2dx-3dy-5dz = 2x-3y-5z [(1,-2,1),(0,-7,5)] = (0+21-25)-(2+6-5) = -4-3 = -7 You can work the other the same way, but it's easier since only y is involved.
*September 22, 2015*

**Algebra**

time = distance/speed. So, just use your numbers.
*September 22, 2015*

**Please help with this 1**

well, they need to get 26 1/3 yards just to get back to zero. Then another 10 for the 1st down. That's 36 1/3 yards. Or, 10-(-26 1/3) = 36 1/3
*September 22, 2015*

**math**

(42-7):7 = 35:7 = 5:1
*September 22, 2015*

**Algebra**

clearly the half-life is 8 years. So, after t years, the remaining fraction is 18*2^(-t/8) So, plug in t=20
*September 22, 2015*

**math**

You mean F=(9/5)(-62)+32 so, get out your calculator and run the numbers
*September 22, 2015*

**Calculus 1**

Just use the good old chain rule and product rule: f = 5√x sinx f' = 5(1/(2√x) sinx + √x cosx) = 5sinx/(2√x) + 5√x cosx
*September 22, 2015*

**Algebra**

time = distance/speed, so -315 / (-22.5) = ?
*September 21, 2015*

**Math**

eh? the last one you posted was 7 ? 14 31 Take a look at what I said there.
*September 21, 2015*

**Math**

9 9 = 7+(2^0+1) 14 = 9+(2^2+1) 31 = 14+(2^4+1) Then nth term is clearly 7 + 2^(2n-2)+1 That is only one of many ways to fill in the hole. You have so little to work with, you are free to pick almost any value you choose. I suspect that my solution is not the one intended, ...
*September 21, 2015*

**physics/algebra**

s(t) = 0t - 4.9t^2 Technically, s(t) indicates that the object is moving in a negative direction, as if falling from a height of 0m into a canyon. So, you equation should really be s(t) = -82.35 indicating it takes 4.1s to fall 82.35m. I'll let you worry about the +/- signs.
*September 21, 2015*

**physics/algebra**

You correct. t^2 = 82.35/4.9
*September 21, 2015*

**math**

1234*56 = 69104
*September 21, 2015*

**School**

4π+2
*September 21, 2015*

**Algebra**

y = 7 + (1/4)(18-x) for x <= 18 y = 7 for x > 18
*September 21, 2015*

**Math**

D: [0,12] R: [0,140]
*September 21, 2015*

**math**

1 1/2, -2, 2 1/2, -2 3/4
*September 21, 2015*

**Pre-Calculus**

I answered in http://www.jiskha.com/display.cgi?id=1442879979 You, of course, did not enlighten me on the difference between [x] and [[x]]
*September 21, 2015*

**Need HELP reall bad test tommorrow**

greatest integer is easy. Take any value, and use the greatest integer less than or equal to that value. [0] = 0 [0.4] = 0 [0.999] = 0 [1.11] = 1 [2.345] = 2 [1323.3423] = 1323 Watch out for negative values: [-0.5] = -1 [-1.01] = -2 [-14.43] = -15 Still no idea what you mean ...
*September 21, 2015*

**Need HELP reall bad test tommorrow**

just list some x values, and their corresponding function values. Not sure what [[x]] is I think [x] is the greatest integer function (floor) What is [[x]]? ceiling? absolute value?
*September 21, 2015*

**Math.**

600 mi/hr * 1hr/3600s * 1609m/mi = 268 m/s
*September 21, 2015*

**Algebra**

you want |200-18t| = 120 For 200-18t >= 0, you have 200-18t = 120 18t = 80 t = 4 4/9 For t>11.11, 200-18t < 0, so -(200-18t) = 120 -200+18t = 120 18t = 320 t = 17 7/9 So, 4 4/9 seconds after starting, he is 120 ft away. Then he passes you at 11 1/9 seconds, and at 17 ...
*September 21, 2015*

**Math**

start with the smallest possible factor. Divide by it as many times as possible, then move on to the next prime factor, and repeat until you have reached a prime number. 110 = 2 * 55 3 does not divide 55 55 = 5 * 11 There are no other prime factors, so 110 2*5*11 720 = 2*2*2*2...
*September 21, 2015*

**Geometry**

Its a straight line and angle bed is on the line with e = vertex aeb is 1 line of the angle & aed is the other ec shou.ld have been ec
*September 21, 2015*

**Geometry**

no way to tell. If b,c,d are consecutive points on a circle with center at e, where is a in relation to them?
*September 21, 2015*

**Geometry**

bc bisects <bed, m<aeb=11x-12 and m<ced=4x+1 find m<aec
*September 21, 2015*

**Geometry**

<2=<4, m<2= 110 degrees Given m∠2 = m∠4 Definition of congruent angles m∠4 = 110º Complete the 2 column proof
*September 21, 2015*

**algebra**

two more than a number
*September 21, 2015*

**Geometry**

Write the converse of the following true conditional statement. If the converse is false write a counter example. My answer If a < 15 the a < 10 false counter example a = 12 and a > 10
*September 21, 2015*

**Math**

qn ddd now replace each d with nn for the others.
*September 21, 2015*

**Chemistry**

well, at STP, 1 mole is 22.4L, so 8.62mL = 8.62/22400 moles 1/3 of that is O2, no?
*September 21, 2015*

**Algebra**

(343x^-6y/8y^-8x^6)^-2/3 = (8y^-8x^6/343x^-6y)^(2/3) = (8/343)^(2/3) (x^6/x^-6)^(2/3) (y^-8/y)^(2/3) = (2/7)^2 (x^12)^(2/3) (y^-9)^(2/3) = 4/49 x^8/y^6 or 4x^8 / 49y^6
*September 21, 2015*

**Precalculos**

since quadratics are symmetric, the vertex of this parabola occurs when x = 2. The y-intercept is at y=5, so y = a(x-2)^2 + k y(0) = 4a+k = 5 y(1) = a+k = 2 solve for a and k, and you have y = (x-2)^2 + 1 verify at http://www.wolframalpha.com/input/?i=plot+y%3D%28x-2%29^2+%2B+...
*September 21, 2015*

**math**

(2+4)+6 = 2+(4+6) or something like that
*September 21, 2015*

**Pre-Calculus**

so, have you drawn the angles? sin(θ) = y/r For both angles, y and r are the same.
*September 21, 2015*

**prealgebra**

Don't know, but we know that 5*2^r2 = 5*2^r1 + 240 2^r2 = 2^r1 + 24 2^r1 (r2-r1+1) = 24 = 2^3(2+1) So, r2-r1 = 2 and r1=3 Juan's book was 4 days overdue Jada's book was 6 days overdue Juan's fine: 5+10+20+40 = 75 Jada's fine: 75+80+160 = 315
*September 21, 2015*

**Algebra**

If Carol takes x hours, then 1/x + 1/(x+6) = 1/4
*September 21, 2015*

**Algebra**

since time = distance/speed, then If his pre-gas speed was x mph, then 5 + (490-5x)/(x+10) = 9
*September 21, 2015*

**physics**

Sorry. A force directed N and a force directed west of N cannot have a resultant directed N.
*September 21, 2015*

**math - Bogus!**

Between the missing data and the bad English, I cannot solve the problem.
*September 21, 2015*

**Math**

A geometric constructions usually involve a compass and a straightedge. And, of course, a pencil.
*September 21, 2015*

**Math**

if you mean a line segment, and the bisectors are also to be line segments, then there are many bisectors, but they are all perpendicular to the segment, and they all go through the midpoint of the segment. So, yes: D.
*September 21, 2015*

**Math**

correct
*September 21, 2015*

**Sociology**

television advertisements typically portray the elderly as? a- wise and knowing b- dignified and nurturing c- respectable and accomplished d- feeble and foolish my answer is b
*September 21, 2015*

**math**

Since y^7 that is not a choice, I'll assume you meant y^4 / y^3 = y^1
*September 21, 2015*

**physics**

net displacement is zero, so there is no change in potential+kinetic energy. PE = mgh, which has not changed, so KE also has not changed. Hence, since mass has not changed, and mv^2 has not changed, neither has v^2. However, v has changed from upward to downward. So, the ...
*September 21, 2015*

**Physics**

horizontal speed is 318 cos 36.2° = 256.613 m/s So, how far does it travel in 7.68s? Remember that the horizontal speed does not change after takeoff. The only force acting is the vertical pull of gravity.
*September 21, 2015*

**Math**

b+p = 13b b+5.04 = 13b 12b = 5.04 b = 0.42
*September 21, 2015*

**Physics**

you want to convert distance to time 6m / (2m/s) = 6/2 s
*September 21, 2015*

**College Physics**

the snowball's horizontal speed as it starts to fall is 8 cos 40° = 6.13 m/s Since s = 1/2 at^2, it takes 1.69 seconds to fall 14 meters. It takes only 1.58s to fall to the height of the man's head. So the ball moves horizontally 6.13*1.58 = 9.69 meters. Looks like...
*September 21, 2015*

**maths**

2(x+y) = 18 xy = 20 since x+y=9, can you think of two factors of 20 which add up to 9?
*September 21, 2015*

**logistics**

so, did you do some research on India?
*September 21, 2015*

**physics**

Think of the units: (20 m/s) / (6 m/s^2) = 3.33 s Think of it like this. Every second the speed decreases by 6 m/s. So, it takes 3.33 seconds to lose all 20 m/s. Or, how about this: a = ∆v/∆t so, ∆t = ∆v/a = (0-20)/-6 = = 3.33
*September 21, 2015*

**Physics**

max h is at v^2/2g
*September 21, 2015*

**algebra**

g(x+2) = 7(x+2)-2 = 7x+12 g(x)+g(2) = 7x-2 + 7*2-2 = 7x+10
*September 21, 2015*

**Math**

n+3 < 50 n < 47
*September 20, 2015*

**phyics**

think about it. If it takes 11 seconds for the speed to go from 0 to 22, clearly, the speed grows by 2 each second. So, a = (2m/s)/s = 2 m/s^2
*September 20, 2015*

**Math**

45-8+53-6 = ?
*September 20, 2015*

**physics**

you can get easy conversions at wolframalpha.com Just enter you polar values, and you can read off the Cartesian ones. For example, http://www.wolframalpha.com/input/?i=440+cis+100%C2%B0 It shows the polar value as a complex number, but that's just the x- and y-components...
*September 20, 2015*

**calculus**

Not enough data. The shell could have been fired fast and steep, or slow and shallow, and could still have hit the plane. If the shell is fired with speed v and at angle θ, its horizontal speed is v cosθ. So, if it hits the plane at time t, we have v cosθ t = ...
*September 20, 2015*

**math**

you can play around with Z-table stuff at http://davidmlane.com/hyperstat/z_table.html
*September 20, 2015*

**Physics-HELP**

N: 775 cos 42.5° W: 775 sin 42.5° now recall that distance = speed * time
*September 20, 2015*

**math**

I'd say it depends on how many students there are, eh?
*September 20, 2015*

**Math**

You can work with Z table stuff at http://davidmlane.com/hyperstat/z_table.html
*September 20, 2015*

**Math**

Play around with Z table stuff at http://davidmlane.com/hyperstat/z_table.html
*September 20, 2015*

**math**

if the two numbers are positive, then since each is greater than 1, the product will be greater than either factor.
*September 20, 2015*

**physics**

or them to arrive at the same time, we need d/6.27 = (d+32.1)/9.06 any value of d greater than that will be fatal for the tourist.
*September 20, 2015*

**math**

you have divided the wrong way. You want mi/gal.
*September 20, 2015*

**math**

of a rectangle with width 2 and length 5.
*September 20, 2015*

**Math**

just use what you are given: 500p - p^2 >= 60000 Now, just from what you know about parabolas, you know that the parabola opens downward. So, the portion of the curve above a horizontal line (here, y=60000) will lie between the roots of 500p - p^2 - 60000 = 0 The roots are ...
*September 20, 2015*

**Pre-Calculus**

vertical asymptotes where the denominator is zero. I assume you can figure that out. Hint: don't bother expanding the denominator...
*September 20, 2015*

**7th grade math **

Product of hundreds and tens place is 1. clearly the 1st and 3rd digits are 1. So, the number is 171.
*September 20, 2015*

**Math**

solve for t in 10000(1.05^t - 1)/.05 = 1000000 or 1.05^t - 1 = 2000 ...
*September 20, 2015*

**Maths**

It's always true, since both sides are always positive or zero.
*September 20, 2015*

**math**

the marked price is 200(1.50) The discounted price is thus (200)(1.50)(1-0.25)
*September 20, 2015*

**algebra**

Assuming the restaurant is in NYC, that means that if the whole distance is x, 1 + x/2 + x/6 = x
*September 20, 2015*