Thursday
May 5, 2016

Posts by STEVE

Total # Posts: 40,168

Parametric Curve
visit wolframalpha.com and type in your functions, as in (d) below http://www.wolframalpha.com/input/?i=parametric+plot+x%3D%282t+%2B+1%29sint,+y%3D%282t+%2B+1%29cost
May 4, 2016

Parametric Curve
visit wolframalpha.com and type in your functions, as in (d) below http://www.wolframalpha.com/input/?i=parametric+plot+x%3D%282t+%2B+1%29sint,+y%3D%282t+%2B+1%29cost
May 4, 2016

Parametric Curve
visit wolframalpha.com and type in your functions, as in (d) below http://www.wolframalpha.com/input/?i=parametric+plot+x%3D%282t+%2B+1%29sint,+y%3D%282t+%2B+1%29cost
May 4, 2016

Math
The following table shows the rate of water flow (in L/min) through a dam. t (min) 1 6 11 16 21 26 31 V'(t) (L/min) 1 8 2 9 7 5 9 Approximate the total volume of water that passed through the dam from t=1 to t=31 using Simpson's rule, with n=6.
May 4, 2016

Math
looks good to me
May 4, 2016

math
7*4*h = 56
May 4, 2016

Math
looks like 3/5 to me oh, you mean 3/5 each? Then that would of course be 4 * 3/5 = 12/5
May 4, 2016

Math
Nope. It is 7!, but that's not 2520
May 4, 2016

Math
well, (3+7)/2 h = 25
May 4, 2016

Algebra
yes a^x where a is any constant is an exponential function
May 4, 2016

Pre-Algebra
you mean area, or length? If area, then (16+6w+2w)(48+6w+2w)-(16+6w)(48+6w) = 28w^2 + 128w in^2
May 4, 2016

Algebra 2
D = |2 3| |3 5| so B is out Replace the 1st column with (5,7) and that gives D.
May 4, 2016

Algebra
nope: add 10^3 * 10^5 = 10^8 what you have is 10*10*10 * 10*10*10*10*10 you multiply the numeric part 3*10^2 * 2*10^5 = 3*2 * 10^2*10^5 = 6*10^7
May 4, 2016

Math
all it tells me is that it is a parabola that crosses the x-axis at 4 and -2/5.
May 4, 2016

math
drama scale? You mean drawn to scale? 2(.005*6 + .005*13 + 6 * 13) = 156.19 m^2 I suspect a typo.
May 4, 2016

Urgent help Ms sue
i guess so
May 4, 2016

Urgent help Ms sue
how can the three designs be used to combat truancy in schools?
May 4, 2016

Urgent help Ms sue
Education researchers believe that a new approach to tackling truancy may help to reduce truancy levels. They wish to carry out a trial to compare the efficacy of the new approach with an existing approach. It is known that some schools have lower truancy rates than others, ...
May 4, 2016

math
no - it depends on where they started.
May 4, 2016

math
just change the sign of all the x-coordinates. try graphing and flipping a few points to see why this is.
May 4, 2016

Math
well, F=ma plug and chug. watch the units. Using clear English would also help...
May 4, 2016

SAT math
P(t) = 300,000
May 4, 2016

algebra
If you have x lbs of deluxe and y lbs of economy, then you want to maximize p=7x+5.4y subject to x/2 + y/2 <= 130 2x/3 + y/3 <= 170 now graph the lines and find the vertex with maximum p.
May 4, 2016

huh?
You want to try that in short clear sentences the way you got it? Don't make us figure out the question as well as the answers...
May 4, 2016

Phy
is the change linear? If so, then since 2.3 is 3/5 of the way from 2.0 to 2.5, the temperature would be 3/5 of the way from 0 to 100 degrees.
May 4, 2016

Algebra 1
.30(90-x) + 0(x) = .23(90)
May 4, 2016

math
Friday: the amounts are n and j Saturday: 2n/3 and j+n/3 Sunday: 2n/3 + (1/3)(j+n/3) and (2/3)(j+n/3) = j/3 + 7n/9 and 2j/3 + 2n/9 so, j/3 + 7n/9 = 96 2j/3 + 2n/9 = 120 Nathan had $54 and Jasper had $162 I'll let you verify the accuracy of the solution.
May 4, 2016

math, functions
g(x) = f(f) = 1/(1-f) = 1/(1-(1/(1-x)) = 1 - 1/x h(x) = f(g) = 1/(1-g) = 1/(1-(1 - 1/x)) = x But, as you say, watch for places where f is undefined. I'm sure you can figure those out.
May 4, 2016

Algebra 1
you want to decrease the concentration by 23/30, so that means you have to increase the volume by 30/23. 30/23 x = 90 x = 90 * 23/30 = 69 So, add 21 gallons of water
May 4, 2016

DamotAk mathematecs
x^2 = 90^2 + 90^2 - 2*90*90*cos(140°)
May 4, 2016

Trig
amplitude of 3/5: 3/5 cos(x) period of 3pi/2: 3/5 cos (4/3 x) y-intercept of 5: 22/5 + 3/5 cos (4/3 x) http://www.wolframalpha.com/input/?i=22%2F5+%2B+3%2F5+cos+%284%2F3+x%29
May 3, 2016

Algebra
so, the new tanks will hold (5/4)^3 as much oil, or 23437.5 gallons each
May 3, 2016

Math
Zoe feeds 6 horses per hour Matt feeds 2 horses per hour. So, together they feed 8 horses per hour, taking 4 hours to feed 32 horses
May 3, 2016

Math
40+10+25m = 50+15m+10m as given, if the Zumba class is each month, then both Gyms cost exactly the same: $50 in fees and $25 monthly
May 3, 2016

geometry
∠A = 15+15 = 30 = ∠B ∠C = ∠D = (360-30-30)/2 = 150 so, ∠ACD = 180-150-15 = 15 ∠BCA = 150-15 = 135
May 3, 2016

PLEASE HELP ASAP
looks good. when you say my answer is a? are you asking what your answer is?
May 3, 2016

math
since time = distance/speed, 24/(x-4) + 24/(x+4) = 14
May 3, 2016

maths
what is the coefficient of (x+2)^3 in the cubic taylor polynomial about -2 for the function f(x)= e^x?
May 3, 2016

Geometry (check my work)
why would you compare volume to surface area? The volumes are scoop: pi/6 * 6^3 = 113.1 cm^3 cone: pi/12 * 5^2 * 9 = 58.90 cm^3 the cone is too small, but because the volumes compare so.
May 3, 2016

Maths Please help
What is the quadratic Taylor polynomial about 2 for the function f(x)=square root x-1?
May 3, 2016

maths
surely you have the formula. What's the trouble? Just express it as a polynomial in (x + pi/3)
May 3, 2016

maths
What is the Linear Taylor polynomial aout -(pi/3) for the function f(x)=sin(x)?
May 3, 2016

Maths ple
b^8 is the 9th term, so its coefficient is 17C9 = 24310
May 3, 2016

Maths ple
what is the coefficient of a^9b^8 in the expansion of (a+b)^17
May 3, 2016

Please help
d=3, so there are 1+(260-2)/3 = 87 terms S87 = 87/2 (2+260) = 11,397
May 3, 2016

Math
L(L-3)=70 Hmmm. 10*7 = 70
May 3, 2016

algebra PLEASE HELP ASAP
looks good to me. 1 M in 7 letters.
May 3, 2016

Math
20 scores, with 5 less than 2.34 5 is 25% of 20, so the 25th %ile or 6 <= 2.34, making it the 30th %ile
May 3, 2016

Algebra
clearly you have skipped the definitions. arithmetic has terms which differ by the same amount geometric has terms with a common ratio, one to the next. a) has a ratio which changes: A(n) = A(n-1)*n A(n)/A(n-1) = n, which is not constant not GP or AP b)That +8 is a dead ...
May 3, 2016

math
do you have some kind of calculation to buttress your gut feeling? play with some numbers, at least.
May 3, 2016

math
original: n/d new: .5n/.75d = (2/3)(n/d) so, it is decreased by 33.3%
May 3, 2016

Math -Trig
for any x, cot(x) = 1/tan(x) 3pi/4 is in Quadrant II, so draw the triangle. x = -1 y = 1 cot(3pi/4) = x/y = -1/1 = -1 or, consider that cot(pi-x) = -cot(x) since cos(pi-x) = -cos(x) and sin(pi-x) = sin(x) so, cot(3pi/4) = cot(pi - pi/4) = -cot(pi/4)
May 3, 2016

Math - Trig
12 revolutions per minute 3.5*pi meters per revolution ...
May 3, 2016

math
Apparently greedy Ashley already had 1/4 of a pizza! anyway, 1 3/4 = 7/4 divide that by 11, as we're just talking about the friends.
May 3, 2016

half-life
.5mg is 1/8 of 4 mg 1/8 = (1/2)^3 so, that's 3 half-lives
May 3, 2016

math
60/36 ft * 12in/ft
May 3, 2016

maths
200 sin40
May 3, 2016

Math
1/6 of the time for each number.
May 3, 2016

math
11!/(2!2!2!2!) = 2,494,800
May 3, 2016

Calculus
see a nice calculator here to check your work: http://www.emathhelp.net/calculators/calculus-2/simpsons-rule-calculator/
May 3, 2016

math
(60 * 0.80 - 10) * 1.55 = $58.90
May 3, 2016

math
a = b + 0.50b = 1.5 b b = a/1.5 = 2/3 a so, b is 1/3 less than a, or 33.3% less
May 3, 2016

math
increasing by N% means the new value is 1+N/100 as much as the old value. So, we have new = old*(1+1)(1+1.5) = 5.00 * old so, old = new/5 or 20%
May 3, 2016

math
x * 1.25 = 2 x = 1.6 so, the first increase was 60%
May 3, 2016

urgent math
#1. 7^(9-3) = 7^6 NOT 7^(9/3) = 7^3 subtract exponents when dividing numbers. What you have is 7*7*7*7*7*7*7*7*7 ------------------------       7*7*7 only three of the 7's cancel #2 z^8/z^12 = 1/z^4 = z^-4 So, D, not C #3 ok #4 not sure what ...
May 3, 2016

Math
two adjoining trapezoids produce a figure with six sides. You only give four lengths. You will need to use the sides and the Pythagorean Theorem to determine the heights of the trapezoids. Then it's easy, since you know the formula for the area of a trapezoid, given its ...
May 3, 2016

Algebra
#10. since 1=√1, you must have -2v-3 = 1 #11. √(n+5)= √(5n-11) n+5 = 5n-11 n = 4 check: √9 = √9 #12. well, geez, just check them! √(12-(-4)) = √(12+4) = √16 = 4 Since this is not equal to -4, that value is extraneous. √(12-...
May 3, 2016

math
independent means they can both happen, and do not affect each other. Like two consecutive rolls of a die. Rolling a 3 and then a 6 are independent, and can both happen. Mutually exclusive events cannot both happen, such as flipping a coin and getting both a head and a tail. ...
May 3, 2016

Science
well, time = distance/speed, so just crank it out.
May 3, 2016

Math
(2 – 9c)(–8) 2(-8)+(-9c)(-8) -16 + 72c
May 3, 2016

Geometry/Trig
since the acute angles are 45°, the two legs are both 16 (a fact you left out) so, the hypotenuse is √(16^2 + 16^2) = 16√2
May 3, 2016

chemistry
moles KOH = .0175 * .553 = .00968 so, you need that many moles of HBr, making the molarity M = .00968/.025 = 0.387
May 3, 2016

Math
x - x/3 + 25 = 115
May 3, 2016

math 1324
x+y+z = 2000000 .07x + .085y + .095z = 169750 y = 4z see the matrix solution at http://www.wolframalpha.com/input/?i={{1,1,1},{.07,.085,.095},{0,1,-4}}*{{x},{y},{z}}+%3D+{{2000000},{169750},{0}} {{1,1,1},{.07,.085,.095},{0,1,-4}}*{{x},{y},{z}} = {{2000000},{169750},{0}}
May 3, 2016

Analytic Geometry
cot2θ = 0 so θ=45° Then just do the rotation matrix stuff to find the equation in the new coordinates.
May 3, 2016

math
won = 15+3*lost won + lost = 123 lost = 27 won = 96
May 3, 2016

math
3/200 = 1.5/100 = 1.5%
May 3, 2016

Math
tanx/sinx = 1/cosx cosx=0 at odd multiples of pi/2. So, that is where you have asymptotes. cosx changes sign at those points, so also does your graph.
May 3, 2016

math
depends on the area of the base. Divide the volume by the area to get the height.
May 3, 2016

math - eh?
huh?
May 3, 2016

math - Correction.
that is an obtuse angle. I'd say 0° < d < 90°
May 2, 2016

Maths
The three numbers will therefore be close to 21.98. So, I'd say they'd be 21,22,23 whose product is 10626
May 2, 2016

math
480ft/30s * 60s/min = 960 ft/min
May 2, 2016

math
not so. you have found d/dt (dy/dx), but you want d/dx (dy/dx) = d/dt(dy/dx) / dx/dt = -1/(1+t)^2 / e^t = -1/((1+t)^2 e^t)
May 2, 2016

TRIGONOMETRY2
can't use google? 1st hit led to http://www.cut-the-knot.org/proofs/2Colors2Points.shtml#solution
May 2, 2016

TRIGONOMETRY
√(x+b)-√(x-a) >= √(x+a)-√(x-b) since x>=a>=b, we have x+b >= 2b x-a >= 0 x+a >= 2a >= 2b x-b >= x-a see what you can do with that
May 2, 2016

Math
the ratios are: length: 11/33 = 1/3 width: 7/28 = 1/4 so, not similar
May 2, 2016

math
not quite. log(x^2) = 2logx 150 = 3*100/2, so log 150 = log3 + 2log10 - log2 75 = 3*(10/2)^2, so log75 = log3 + 2log10 - 2log2 or, since 75 = 150/2 log75 = log150-log2 as above
May 2, 2016

Probability
1/15000 (1000 + 2*300 + 20*10) = 3/25
May 2, 2016

Math
there is no limit. There must be some other considerations.
May 2, 2016

Geometry
well, just check. a sphere with diameter d has volume π/6 d^3 3*(π/6)(5^3) = 375π/6 (π/6)*8^3 = 512π/6 π/12 * 10^3 = 500π/6
May 2, 2016

calculus
94 ∑ k k=3 assuming you meant ... 144, 12 ∑ k^2 k=3
May 2, 2016

Algebra
y=5x
May 2, 2016

pre-cal
as they said, the total area is xy as for the print area, that is (x-2)(y-3) = 26
May 2, 2016

calculus
maximize p=x(30-x)-100-6x subject to x >= 10 x <= 20 the profit is revenue-cost, so p(x) = x(30-(x-10)) - 100 - 6x = -x^2+34x-100 dp/dx = 34-2x dp/dx=0 at x=17
May 2, 2016

calculus
this is just the chain rule in reverse. G'(x) = cos(x^2) (2x)
May 2, 2016

calculus
change all the t's to x^2, then multiply by (x^2)' G(x) = cos(x^2)(2x)
May 2, 2016

math
it is a function whose graph is s straight line.
May 2, 2016

calculus
Sketch the region. It has vertices at (0,0), (2,0), (4,2) You can get the area by using vertical or horizontal strips. Using vertical strips, they all lie below the curve √x, but the lower boundary changes from y=0 to y=x-2 at x=2. So, the area is ∫[0,2] √x ...
May 2, 2016

math
as usual, v = Bh = 20*10 = 200 cm^3 note that the area of the base must be in cm^2, not just cm.
May 2, 2016

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