Saturday
December 10, 2016

Posts by Steve

Total # Posts: 47,042

Pre-Calculus
what, forgot you algebra? cosx = -1/2 ...
November 10, 2016

Math
uh, ... 12.4 * 0.42 assuming zero tare weight ...
November 10, 2016

Math
Try using standard ascii characters for your operators: > >= < <=
November 10, 2016

Math
watch the units: 300km/2hr = 300/2 km/hr
November 10, 2016

Math
No way to tell d=0: s > -3 d=-6: s > 3 d=100: s > -103
November 10, 2016

Math
354 and 971
November 10, 2016

math
What do you mean by 1 1/2 times smaller? That's like 150% discount. 100% already takes you down to zero. Do you mean that 2 3/4 is 1 1/2 times a much as you want? If so, then you want 2/3 as much, or 2 3/4 * 2/3 = 11/4 * 2/3 = 22/12 = 1 5/6
November 10, 2016

Math
f(x) = 55
November 10, 2016

college maths
P(1 + .065/4)^4 = 1600
November 10, 2016

Math
Or, just find the cube roots of your numbers. For example, ?60 = 3.91 so, it is between 3 and 4, since 3^3 = 27 4^3 = 64
November 10, 2016

Math
start listing the cubes: 1: 1 2: 8 3: 27 ... Then pick the two numbers from column 1 that correspond to the cubes near your targets in column 2.
November 10, 2016

pre-calculus @Damon is right
Sorry - I missed the -2 ; read x=2
November 10, 2016

pre-calculus
(A) y = 1/(x-2)(x-5) (B) y = (x+3)^2 / (x-2)(x-5) (C) y = 3(x+3)^2 / (x-2)(x-5)
November 10, 2016

math
T1 = 12 Tn = (-1)^n * |Tn-1| - 3
November 10, 2016

Math
If the side is x cm, then 4(x-2*4)^2 = 144 Or, since the height of the box is 4 cm, and 144/4 = 36, the final base of the box is 6x6 cm. That makes the original size 14x14
November 10, 2016

math help
google is your friend. Just look for "fractions math examples" and you will get lots of hits.
November 10, 2016

pls help!!! -- typos galore!!
#1 (a) unbalanced parentheses 9>4t<l) ?? both f and t a d l? Fix the typos and try again. Use * for multiplication online. And 7-+4 is probably better just as 7-4 (unless you meant something else) #2 google makes a good calculator. But even without it, the only numeric ...
November 10, 2016

physics
The induced emf in a coil is equal to the negative of the rate of change of magnetic flux ... So, if the flux increases, the emf decreases, but the absolute value increases.
November 10, 2016

math
Try this instead: I know how to spell, and I know grammar. Here is the sentence again: "Hi, I am of no help to you because I don't know the answer. Sorry, hope you pass the class." and by the way, sorry for having fun (_><_); it's not a privilege, it&#...
November 10, 2016

@Anonymous
What a waste of posting. Since you are no help here, maybe you can work on your spelling and grammar.
November 10, 2016

Finite math
Suppose the initial amount is x, the monthly rate is r=1.01, and the fee is f. Then the amount left at the end of each month is x*r-f (xr-f)*r-f = xr^2-fr-f (xr^2-fr-f)*r-f = xr^3-fr^2-fr-f The amount at the end of the nth month is thus xr^n - f(r^n-1)/(r-1) So, for your ...
November 10, 2016

Calculus
yes.
November 10, 2016

English
they are all adverbial phrases. They are all modifying the verb. I guess syntactically they could be adjectives working on the direct objects, but I think the sense is clearly that the enjoying and the visiting are what is in London and Chicago.
November 10, 2016

physics 1
This was something you had to post a question on? Surely your text discussed the units. then there's always google.
November 10, 2016

Math algebra
(88+92+97+96+x)/5 = 90 You had a hard time following the explicit instructions?
November 10, 2016

Math
10*180/12
November 10, 2016

Math
so, which pair of points lie on the line?
November 10, 2016

statistics
No idea. Add up all the weights and see.
November 10, 2016

math
3a - 4 < 5 add 4: 3a < 9 only one step left...
November 10, 2016

physics
think about it. A deceleration of 2 m/s^2 means that the velocity decreased by 2 m/s each second. So, here, the velocity changed by -25 m/s in 4 seconds. Look at the units. How do you get from m/s to m/s^2?
November 10, 2016

Math
m < 7
November 10, 2016

math
just write down the facts. If there are a,b,c,d of 5,10,20,50 notes, then b=5a b=4c b=10d 5a+10b+20c+50d = 8400 Now just plug and chug
November 10, 2016

maths sir steve help~reiny
since cos(z) = sin(?/2 - z) sin(?cosx)-cos(?sinx)=0 sin(?cosx) = cos(?sinx) sin(?cosx) = sin(?/2 - ?sinx) so, ? cosx = ?/2 - ?sinx ?(cosx+sinx) = ?/2 cosx+six = 1/2 You can probably take it from there, eh?
November 10, 2016

math
no idea. But I'll check yours.
November 10, 2016

math
no idea, but I'll be happy to check yours.
November 10, 2016

Algebra2
thank you
November 10, 2016

Algebra2
Wind farms are a source of renewable energy found around the world. The power P (in kilowatts) generated by a wind turbine varies directly as the cube of the wind speed v (in meters per second). If a turbine generates 500kW in a 10m/s wind, how much power does it generate in a...
November 10, 2016

Math
(3 * 1/4 mi) / (4.5min) * 60min/hr = 10 mi/hr
November 9, 2016

CALCULUS
well, you know the distance z at time t is z^2 = (130-30t)^2 + (20t)^2 = 1300t^2 - 7800t + 16900 so, at 4:00, z = 10?145 z dz/dt = 2600t - 7800 = 2600(t-3) Now plug in t=4
November 9, 2016

Algebra- Word Problem
each pet has at least two legs. No way can 40 pets have only 56 legs!
November 9, 2016

Math
Can't be sure, but I'd guess 7.2
November 9, 2016

math - hmmm
I think my answer to (c) is bogus. Still thinking on it.
November 9, 2016

math
(1) 1 (b) Must each bowl have at least one marble? (c) 12C2 * 6!
November 9, 2016

The Tangent Function
Or, method two simplifies a bit if you're not afraid of the cot(x) function: h cot25 - h cot30 = 40
November 9, 2016

Math
google "long division" for man examples of the method
November 9, 2016

Algebra
3/4 x + 4 <= 19
November 9, 2016

math
well, it would be stupid to have photos bigger than the album, eh?
November 9, 2016

Natural science
Why are the coldest temperatures at the lowest 50 km height from the surface of the Earth, occur generally at tropical tropopause?
November 9, 2016

Math
T = 80-8t
November 9, 2016

Trig
or, recall that u dot v = |u| * |v| * cos(theta)
November 9, 2016

Calculus
yes, but there's not much to solve at that point. Just evaluate the expression: 2*12 - 3*5
November 9, 2016

MATH
yes
November 9, 2016

MATH
m - 7 < 6 Nope. ADD 7 to both sides. n - 8 > 5 correct How could you get this one right, and miss the others? Guessing? p + 5 < 10 Nope. Subtract 5 from both sides bus problem. correct
November 9, 2016

Math
well, 88 ft/s is 60 mi/hr So, about half that.
November 9, 2016

math
Clearly there were 300 boys and 400 girls.
November 9, 2016

math
no way to tell without some measure of the relative number of boys and girls. If there were 6 girls and 7 boys, then 2/13 If there were 60 girls and 7 boys, then 11/67 try to post correct problems if you want correct answers.
November 9, 2016

MATHS
EF is the average of the two base lengths: (AB+CD)/2
November 9, 2016

calc
You're in calculus and can't sketch linear functions? If you type in the integrals as I showed them, wolframalpha.com understands the notation. For example http://www.wolframalpha.com/input/?i=%E2%88%AB%5B-2,6%5D+%7Cx-1%7C+dx
November 9, 2016

calc
Just use the power rule for these. ?[1,4] 2x+3 dx = x^2+3x = 24 Recall the definition of |n|: = n if n >= 0 = -n if n < 0 ?[-2,6] |x-1| dx has to be broken up at x=1, so you get ?[-2,1] -(x-1) dx + ?[1,6] (x+1) dx = 17
November 9, 2016

Algebra
they are both parabolas. #1 opens up, so its range has a minimum #2 opens down, so its range has a maximum So, just find the vertex; that defines the closed end of the range.
November 9, 2016

Advance Quantitative Reasoning
Huh. You really need to study them. Try law of sines: c/sinC = b/sinB law of cosines uses two sides and their included angle to find the 3rd side.
November 9, 2016

Math
Read what you posted. Fix it so it makes sense and try again.
November 9, 2016

algebra
(L-5) = 1/4 (K-5) L+K = 110 Now just solve. wait -- by 1/4 as young, do you mean 4 times as old? That could be a game changer...
November 9, 2016

math
as always, 2 times (length+width) = 24 ft + 84 in.
November 9, 2016

math
4/5 as much gas means 5/4 as much distance
November 9, 2016

MATH
well, twice the distance would be 2 inches, right? You have (375/200) times the distance, so ...
November 9, 2016

math
well, start with n Then n+12 then 2(n+12) then ... finally, solve the equation for n
November 9, 2016

Pre Calc
twice what amount? Read what you posted, and fix it so it makes sense.
November 9, 2016

Maths
(12000/400) * 9/4 minutes
November 9, 2016

Maths
5.14999999999999999999999999999994
November 9, 2016

math
342/14 round up if needed.
November 8, 2016

Algebra 2
well, did you graph the lines of the constraints, and shade the appropriate areas? This web site will solve the problem and even graph the solution if you want: http://www.zweigmedia.com/RealWorld/LPGrapher/lpg.html
November 8, 2016

Math/algebra
one expression is 10+5h
November 8, 2016

Calculus
You forgot the chain rule. F'(x) = ?(1+(x^2)^3)*(2x) - ?(1+x^3)*(1) F'(4) = ?(1+4096)(8)-?(1+64) visit this url and scroll down about halfway -- there is a good example with variable limits of integration. https://en.wikipedia.org/wiki/Leibniz_integral_rule
November 8, 2016

math
if the fractional part is less than 0.5, round down.
November 8, 2016

Math
2(2.5+2*.3 + 1.2+2*.3) = 9.8m or, the original perimeter plus two sides of each of the the four 30cm squares on the corners: 2(2.5+1.2) + 4(2*0.3) = 9.8
November 8, 2016

math
If the initial deposit was x, then compare the interest: .06(x+12000) = .05x + 1100 x = 38000
November 8, 2016

math
(3 3/4)(1 5/6) = 6 7/8
November 8, 2016

Maths
330m/s * 6s = 1980 m
November 8, 2016

intermediate algebra
since time = distance/speed, 24/s = 19/s + 1
November 8, 2016

Maths
total parts water: 2+3 total parts vinegar: 1+1 final ratio is 5:2
November 8, 2016

math
61
November 8, 2016

Physics
W = J/S = N-m/s So, in t seconds, 250*9.8*25/t = 4000
November 8, 2016

Calculus AB - PS
Rats. I made a typo near the top of #2. dy/dt = 1/(3?x^2) dx/dt (a) at x=8, 1 = 1/(3*4) dx/dt so, dx/dt = 12 at x=8, not 6. You will have to use that in the other parts. Also, in part (c) I made a typo. It should be sec^2? d?/dt = (-2/3)x^(-5/3) dx/dt, so d?/dt = -36/160
November 8, 2016

Calculus AB
(a) If the man is x feet from the light pole, and his shadow has length m, then using similar triangles. (x+m)/30 = m/6 In like wise, if the child's shadow has length c, then (x+10+c)/30 = c/3 So, we need to show that x+m > x+10+c when x=90 90+m=5m 90+10+c = 10c m=90/4...
November 8, 2016

geometry
Just like all the related questions below, The x,y distances from E to F are (10,-5) If G is 1/5 of the way from E to F, add 1/5 of the difference to E. G = (-4,9)+(2,-1) = (-2,8) If G is at the other end, subtract those values from F.
November 8, 2016

Math
(3.5)(2 2/5)(2.5-0.25) = 18.9 m^3 and it was probably concrete, not cement...
November 8, 2016

math fraction
It would look like a handful of candies, 1/3 of which were red. If there were n M&Ms, then n/3 would be red.
November 8, 2016

Science
If you've ever dropped sodium into water, you know that the reaction is violently exothermic.
November 8, 2016

Maths
f^2/g^2 = f^2 g^-2
November 8, 2016

Math
If the sum starts at the (k+1)st odd number, its sum is (k+288)^2 - k^2 = 576k + 82944 When k=432, the sum is 331,776 = 24^4 How you'd find that algebraically I have no clue.
November 8, 2016

Math
Since ??F = 8yk ? 0, F is not conservative.
November 8, 2016

Math
Did you not read what I wrote? g(0) is not defined, so f/g cannot be defined there. But x?0 is not one of the choices, so something is amiss.
November 8, 2016

Math
f/g = (|x|-1)/(1/x) = x(|x|-1) It would appear that the domain is all real x, but since g(0) is undefined, we have to exclude x=0. But x?0 is not one of the choices. Is there a typo somewhere? (f?g)(x) = f(g(x)) f(g) = (|g|-1) = (|1/x|-1) Again, x?0, so you are correct.
November 8, 2016

Feelings
about average
November 8, 2016

Math
You really need to start using parentheses online, to make things clear: 3/(x^2+x-2) - 1/(x^2-1) = 7/(2x^2+6x+4) Set everything over a common denominator of 2(x-1)(x+1)(x+2). Then, excluding the values of x = -2,-1,1 You just need to find 9-3x = 0
November 8, 2016

maths
(7/2)/(1/4) = 7/2 * 4 = 14 There are 7 half-liters. Each one contains 2 1/4-liters.
November 8, 2016

Calculus
Always be on the lookout for trick questions... Develop your inner laziness!
November 8, 2016

Calculus
Note that the series is collapsing. All the terms except the first and the last cancel out! (1/4 - 1/5) + (1/5 - 1/6) ... + (1/99 - 1/100) = 1/4 - 1/100
November 8, 2016

algebra
see related questions below. Add up your total so far. How many more to have 5*88 at the end?
November 8, 2016

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