Wednesday
May 25, 2016

Posts by steve

Total # Posts: 40,793

alebra
both look good.
May 5, 2016

trigonometry
review your basic trig functions. You will see that the height is 38tan67°30' + 38tan18°20'
May 5, 2016

math
If the amount poured is x gallons, then (35-x)/(4.5+x) = 7/2 find x, and the rest is easy.
May 5, 2016

math. compounding interest
3500 * .075/2
May 5, 2016

math
use your distance formula: √(5^2+8^2)
May 5, 2016

math
clearly, since the box has length 8, the paper must be longer.
May 5, 2016

Trigonomentry
Draw a diagram. If we label the triangle ABC, with sides a,b,c then the law of sines tells us sinC/10.2 = sin117.5°/35 Now you have angles B and C, so you know A=180-(B+C) a/sinA = sin117.5°/35 or a^2 = 35^2+10.2^2 - 2*35*10.2 cosA
May 5, 2016

help maths partail sum
∑ 1/(6k-2) This is just a modified harmonic series, so it diverges. That is, you know that ∑ 1/k diverges. So, this does as well. Don't know a formula for the nth partial sum.
May 5, 2016

Math
just plug in your calculator. What do you get?
May 5, 2016

calculus plz help me
dx/((x-1)sqrt(x^2-2)) OK. First step is a trig substitution. x = √2 sec(u) x^2-2 = 2tan^2(u) dx = √2 sec(u) tan(u) du now the integral is sec(u)/(√2 sec(u)-1) du see what you can do with that.
May 5, 2016

calculus plz help me
see the steps here. http://www.integral-calculator.com/ Interestingly, wolframalpha.com simplifies it a lot.
May 5, 2016

Math
Review your basic trig functions. The height is 1.15 + 95.5tan31.5°
May 5, 2016

math
just plug in your numbers: v = pi/12 d^2 h
May 5, 2016

MLZ
3*2 = 6 but "3 times more than" is kind of fuzzy
May 5, 2016

math
subtract 1:45 + 2(1:12) + 0:45 from 4:15 pm
May 5, 2016

Math
42
May 5, 2016

eh?
no idea what that is supposed to mean
May 5, 2016

Triangles
I did it! What did you do?
May 5, 2016

math
d=c-s/n s/n = c-d s = n(c-d) If you meant d=(c-s)/n nd = c-s s = c-nd
May 5, 2016

geometrt question
f'(x) = -1/x^2, so at x=a, the slope is -1/a^2. So, now you have a point and a slope, so the line is y - 1/a = -1/a^2 (x-a)
May 5, 2016

Calculus
gee - you have the function. Plug and chug. s = πr√(r^2+h^2) ds = π(2r^2+h^2)/√(r^2+h^2) dr Now just plug in the numbers, using -0.1 as dr
May 5, 2016

Physics, Math
how long does it take to drop 4000 ft? use that time and 130 ft/s to get the distance needed.
May 5, 2016

Functions
(c) clearly g(x) is undefined for x=0 But, it is also undefined for x=1, because f is undefined there. g(1) = 1/(1-f(1)) Try that logic for h(x).
May 4, 2016

math
why the final "/1"? It does nothing. So, ignoring it Also, I don't see any initial subject. f maybe? and is that (√s)/c or √(s/c) ?
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
1/x --> 0 as x --> infinity so, what is cos(0)?
May 4, 2016

algebra
If you allow complex numbers, the two numbers are 2+√2i and 2-√2i
May 4, 2016

Math
363 = 300 * 1.21 = 300 * 1.1^2 so, each dimension is increased by 10%
May 4, 2016

precalculus
log(2+x)-log(x-3)=log2 log (2+x)/(x-3) = log 2 (2+x)/(x-3) = 2 2+x = 2x-6 x = 8
May 4, 2016

st josephs
420*1.055^4 + 520*1.055^3 + 750*1.055^2 + 540*1.055 = $2535.38
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

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