Sunday
December 21, 2014

Posts by STEVE


Total # Posts: 27,665

math
since the seat started at 60, it takes 1/2 turn to get back around to that height on the other side. That's 3.5 minutes
November 21, 2014

Math
√112 = ?
November 21, 2014

math
A B is an equation, not an expression C is too, and not even algebraic D is just a constant expression
November 21, 2014

math
Yes. In 1/4 turn, the wheel will be at the top.
November 21, 2014

math
any value between 64.8 and 65.4. For example, 65.0 64.800000000000000000000000000001 65.399999999999999999999999999999
November 21, 2014

plz help. math
Beckey! steven is mooching off your postings! Or, why not just use a single name, steven old buddy?
November 21, 2014

plz help. math
165 = 3*5*11 So, the table could seat 3,5,11,15,33,or 55 people The restriction on table size means that the only choices are 3,5,11,15
November 21, 2014

algerbra
If you mean √2, then the possibilities for a right triangle are 1 and 11, since 1^2 + √2^2 = 3 √2^2 + 3^2 = 11 If you meant 1/2, then the choices are √11/2 and √37/2 (1/2)^2 + 3^2 = √37/2 (1/2)^2 + (√11/2)^2 = 3
November 21, 2014

algerbra
try again. what is /2 ?
November 21, 2014

algerbra - incomplete
First, provide the length of the other side.
November 21, 2014

algebra
one way is to complete the square: x^2 + 5x + 3 = 0 x^2 + 5x = -3 x^2 + 5/x + (5/2)^2 = -3 + (5/2)^2 (x + 5/2)^2 = 13/4 x + 5/2 = ±√13/2 x = (-5±√13)/2 You get the same answer using the quadratic formula.
November 21, 2014

geometry
There are lots of sample constructions here: http://jwilson.coe.uga.edu/EMAT6680Fa08/Ruff/TriangleConstructions/TriangleConstructions.html
November 21, 2014

math
play around some at http://www.miniwebtool.com/hex-calculator/
November 21, 2014

MATH
Assuming hexadecimal, D5C
November 21, 2014

math
better check your text some more. With initial height h and initial velocity v, the height y at time t is y(t) = h + vt - 16t^2 So, you have y(t) = 20 + 5t - 16t^2 When working problems, don't forget what you know about parabolas -- their roots, vertex, etc.
November 21, 2014

college algebra
solve for t in 5300 * 1.077^t = 8000 * 1.056^t t = 20.9 years or, 21, since the interest is credited at year's end.
November 21, 2014

math (fractions)
mixed number
November 21, 2014

DON VASCO PATNA
you want 3/4 the concentration, so you must have 4/3 the volume.
November 21, 2014

algebra 2
just factor out the perfect squares: √25 = 5 √a^2 = a √b^5 = b^2 √b √(a^2/b^2) = a/b
November 21, 2014

Algebra II
you do have to remember to insert zeros for missing powers. Play around at http://www.mathportal.org/calculators/polynomials-solvers/synthetic-division-calculator.php
November 21, 2014

algebra
861bagels/3days = 287 bagels/day
November 20, 2014

math
father = 4y = brother+28 brother = father-28, so 4y-28
November 20, 2014

Algebra
31500(1+.068/365)^(365*30)
November 20, 2014

math
I'm sure you have a formula. For further reading, see wikipedia's article on Richter magnitude scale. It also has a table of sample values, so you can check your answer.
November 20, 2014

Math
2000(1+.05*18)
November 20, 2014

Math
Hmmm. Better make that Tn = n+3 if n is odd
November 20, 2014

Math
Looks to me like Tn = 2n+2 if n is odd Tn = 4*2^(n/2) if n is even
November 20, 2014

Physics
Vy = 7.4*1.7 = 12.58 m/s So, the final speed is √(8^2+12.58^2) = 14.91 m/s
November 20, 2014

math
Ah. missed the 5. So, yes, 5 3/2 = 13/2
November 20, 2014

math
12/8 = (3*4)/(2*4)= 3/2
November 20, 2014

MTH001
So, what are your truth tables?
November 20, 2014

math
If the original price is p, then the discounted price is 0.85p After the fee, the final price is 0.85p + 12 = 100 p = 103.53 That is not the greatest price; it is the only price which will cost exactly $100. It is the greatest price if she does not want to spend more than $100.
November 20, 2014

Math Help
#1. The figures are similar. Since 84/28=3, c/22 will also be 3. SO, c=66 #2. I believe you are correct. The 2nd triangle is 1/3 as big as the first. #3. No. Just double each coordinate.
November 20, 2014

math ?
no, but r=0, as a little synthetic division will show.
November 20, 2014

Math
s = 1/2 at^2 v = at, so t = v/a s = 1/2 a(v^2/a^2) = 1/2 v^2/a = 112^2/64 = 196 ft
November 20, 2014

Math
v(t) = 3/2 t^(1/2) s(t) = t^(3/2) + c 33 = 9^(3/2)+c, so c=6 s(t) = t^(3/2) + 6
November 20, 2014

Calculus
The slope at any point is y' = -7cosx The line through (0,0) and (x,-7sinx) has slope -7sinx/x. That means we need -7sinx/x = -7cosx x = tanx Solutions are x = 4.493409, 7.725252, 10.904122, ... The slopes of the lines are 1.521, -0.899, 0.639 See the first couple of lines...
November 20, 2014

math, please help
Looks to me like f(x) = (x-(-2))(x^2+4x+2)+0
November 20, 2014

Math Help
Looks good to me. Except "¢10 cents" is bogus notation. Try just 10¢
November 20, 2014

Math (IB Calc)
since cos(x) has it max at x=0, and you have a min there, A(x) = 50(1-cos(x)) now just plug in x = 2pi/3
November 20, 2014

Math Help
The scale factor of 2 means that (x,y) -> (2x,2y) So, you need to double the coordinates. Not sure what the heck you devised.
November 20, 2014

Math help!!!
First step: list the ordered pairs. (Mona,Kellie) ...
November 20, 2014

Math
You don't say whether these are courses from due North, or from the positive x-axis. I'll do the latter. the x- and y-components of the vectors are (450 cos65°, 450 sin65°) = (190.18,407.84) (35 cos20°, 35 sin20°) = (32.89, 11.97) Add them up to get (...
November 20, 2014

english
The current exchange rate is 1 yen = 0.0085 dollar So, a little less than 1 cent per yen. Or, a little more than 100 yen/$ 1/.0085 = 111.65
November 20, 2014

English
and you are correct.
November 20, 2014

Pre Calculus
P(0) = 160/(1+9) = 16 Just plug in t=6 for the population after 6 years. Note that as t->∞, e^-0.165t -> 0 So, the maximum possible population is 160 See http://www.wolframalpha.com/input/?i=160%2F+%281+%2B+9e^%28-0.165t%29%29+for+t+%3D+0..50
November 20, 2014

Pre Calculus
25*e^-5k = 18.4 So, k = ln(18.4/25)/-5 = 0.0613 So, now just solve for t in 25*e^-.0613t = 20.5
November 20, 2014

Pre Calculus
solve for m months in (1+.065/12)^m = 2
November 20, 2014

Pre Calculus
after t years, the population p is p = 127000 * 0.976^t Now just plug and chug
November 20, 2014

algebra
k = (h+j)+14 = x + x+4 + 14 = 2x+18
November 20, 2014

Pre-Calculus
The numbers are surely C:1 B:2 A:3
November 20, 2014

math
multiply or divide first, left to right. Then add or subtract, left to right. So, we have 5x5-5+5 25-5+5 20+5 25
November 20, 2014

Math
they are where y=0. If the product of two factors is zero, one of the factors must be zero. So, set them to zero and solve for x: x-6 = 0 means x = 6 and similarly for the other factor.
November 20, 2014

Math
(a) has three factors, so it will be a cubic, not a quadratic.
November 20, 2014

Chemistry
the volume has increased by a factor of 200, so the molarity has decreased by the same amount. 6.00/200 = 0.03
November 20, 2014

math - I'm stumped
So, now you know that d(t) = 5+b sin(ct) Now plug in the values you know: b sin(12c) = 0 b sin(1300c) = 2 b sin(1400c) = 3.46 we can see that 12c is a multiple of π. So, sin(1300c) = sin(1296c+4c) = sin(4c) sin(1400c) = sin(1392c+8c) = sin(8c) Hmmm. I'm stuck. 4c and ...
November 20, 2014

Algebra
yes, as you can easily verify with any of many online calculators...
November 20, 2014

Algebra Help
There is no easy analytic method. The best bet is a graphic or numeric method. You can see from http://www.wolframalpha.com/input/?i=solve+lnx+%3D+-4x that the solution is x = 0.3
November 20, 2014

geometry
if the sides are in the ratio of 3:4, the areas are in the ratio (3:4)^2 = 9:16
November 20, 2014

Calculus Please check
Looks good, except for the last one. It has no critical points, since Fx is never zero. Note that the critical points are where both Fx and Fy are zero.
November 20, 2014

Math
the circumference if the can is 2π. So, there are 10*36/2π labels per roll
November 20, 2014

algebra
http://www.wolframalpha.com/input/?i=y%3C-x-1%2C+y%3Ex%2B4&dataset=
November 19, 2014

algebra2
no idea. What's the connection between the BMW and the savings account?
November 19, 2014

algebra2
15000 * e^(30*0.0133)
November 19, 2014

Math
yep - it's there. Was there a question somewhere in there?
November 19, 2014

Trig
Draw a diagram. If the stations are labeled W and E, and the balloon is B, then angle WBE = 16° angle WEB = 106° So, the distance WB can be found using the law of sines: WB/sin106° = 161/sin16°
November 19, 2014

math
just do a little synthetic division. What do you get?
November 19, 2014

Algebra
Not quite (2^x)(2^x)(2^x)(2^x) = 2^(x+x+x+x) = 2^4x What you have is 2^x+2^x+2^x+2^x = 2^x(1+1+1+1) = 4*2^x = 2^2 * 2^x = 2^(x+2) So, now you have 2^(x+2) = 2^9 x+2 = 9 x = 7 128+128+128+128 = 512
November 19, 2014

Algebra Two
well, that would be (7x+4)(3x-9)
November 19, 2014

algebra 1
-4x-2y = -12 4x+8y = -24 add the two equations and you have 6y = -36 y = -6 now use that to get x
November 19, 2014

Math
First step: list the ordered pairs. (Mona,Kellie) ...
November 19, 2014

Algebra
solve for p in p(1+.12/2)^(2*7/2) = 45000
November 19, 2014

Algebra 2
x is x^1, so x*x^7 = x^(1+7) = x^8 the final answer is thus x^8/2
November 19, 2014

math
12/(12+6) = 12/18 is that at least 0.65?
November 19, 2014

physics
At the top of the toss, all the KE has been converted to PE, so 1/2 mv^2 = mgh or, v^2 = 2gh
November 19, 2014

physics
figure the distance each has traveled, and use the law of cosines to get the final separation. Start by drawing a diagram, so you know what's what.
November 19, 2014

Algebra
2000(1+.05)^18
November 19, 2014

Algebra
Assuming the coordinates are for the kite and the shadow, then the equation describing the line from the kite to the shadow is y = 4x Its slope is 4, so the slope of the string is -1/4. Its equation is y-12 = -1/4 (x-3) So, the x-intercept is (51,0) Thus, the distance is 51 ft
November 19, 2014

MATH!!!
b = 5a/11 c = 5b/11 d = 5c/11 what is the "agreed"? plug in your final result c+?+d=750 and then start substituting in to get a
November 19, 2014

physics
Ever heard of E=mc^2 ?
November 19, 2014

math
3/2 is more than 1 5/6 is just under 1 So, the only two that can cause trouble are 1/8 and 2/9 1/8 = 9/72 2/9 = 16/72 So, the order is clearly 1/8 2/9 5/6 3/2
November 19, 2014

math
area is proportional to the scale^2. So, 12cm^2 * (10^4)^2 = 12*10^8 cm^2 since 1m^2 = 10^4 cm^2, that means the area of the real lake is 12*10^4 m^2 = 12 ha
November 19, 2014

Math
#1 The first equation says y=6-4x. So, use that in the second equation and you have x-2(6-4x) = 15 Do #2 in like wise. Or, you can say that 2x = 10-y, so since 4x = 2(2x), 2(10-y)+2y = 5
November 19, 2014

English
Good idea. What do you have to say?
November 19, 2014

math
little kids
November 18, 2014

math
#1 We see that x = y-2, so 2(y-2)+5y = 9 Do the others in like wise.
November 18, 2014

math
You know you have at least 3 nickels, because only $5.75 can be made with just quarters. So, you have at most 47 quarters. 47 quarters = $11.75 plus 3 nickels = $11.90 That is $6.00 too much. Each quarter replaced by a nickel reduces the value by 20 cents. Since you have $6.00...
November 18, 2014

3rd grade math
all multiples of 2 are even every even row contains all evens every odd row contains multiples of 2 in the even columns. Similarly for the columns.
November 18, 2014

trigometry
Did you draw a diagram? If so, then it's easy to see that sinθ = 20/75
November 18, 2014

Calculus
yes, the product rule, and also the chain rule: y = (x)(e^-x^2) y' = (1)(e^-x^2) + (x)(e^-x^2)(-2x) = (1-2x^2)e^-x^2 If y = e^u, then y' = e^u u'
November 18, 2014

Algebra 2
recall that since i^2 = -1, 1/i = -i 1/(-1-i) * (-1+i)/(-1+i) = (-1+i)/2 1/(2i) = (1/2)(1/i) = (1/2)(-i) = -1/2 i
November 18, 2014

CAL
the tangent line has the same slope as the curve at the point of tangency. The slope at any x is y' = x^2-1 So, y'(1) = 0 Now you have a point and a slope, so the line is y + 2/3 = 0(x-1) or, y = -2/3 See the graphs at http://www.wolframalpha.com/input/?i=plot+y%3D+x^3...
November 18, 2014

Algebra
p = kv^2 so, if v is replaced by 2v, then p becomes k(2v)^2 = k*4v^2 = 4kv^2 = 4p So, p grows by a factor of 4. Makes sense, since p grows as v^2.
November 18, 2014

algebra 1
not quite ∛-64 = -4 (8 is √64) also, you need to divide both exponents by 3. 8=3*2+2 and 5=3+2 so, the answer is -4x^2y ∛(x^2y^2)
November 18, 2014

algebra 1
it's pretty, but it's not the answer ...
November 18, 2014

Math
eh? x <= 49 is "not more than" So, I'd pick (1)and(3)
November 18, 2014

math
multiply top and bottom by 2i: (-5+i)(2i)/-4 = ?
November 18, 2014

math
how about x^2+5x-3 = x+2 x^2+4x-5 = 0 Now it's a cinch, right?
November 18, 2014

6G Math (pls check my answer)
both are correct
November 18, 2014

math
(12.3x10^11)(1.5x10^-12) = (12.3*1.5)x10^(11-12) = ?
November 18, 2014

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