Friday
July 29, 2016

Posts by steve

Total # Posts: 42,157

Pre-Algebra (Check my answers)
as shown, the table does indeed not represent a linear function. If the 8 was a typo and you meant 9, then y = 8x+9
May 27, 2016

Pre-Algebra (Check my answers)
try using 3^n instead of 3n, which looks like multiplication. |-1| = 1, so f(2) = 2*1*2 = 4 If you actually meant (-1)^x, then f(2) = 2*(-1)^2 = 2*1 = 2
May 27, 2016

Math Help Please? (check my work?)
#1 Why do you start adding 10 each time, when the sequence clearly did not? Try adding 9 instead. #2 ok
May 27, 2016

Algebra - oops
oops. I forgot to carry the denominator along. a/bc - 2b^2/ac - 4c^3/ab
May 27, 2016

Algebra
why all the words? That's what math symbols are for. 2a^2 - 4b^3 - 8c^4 ------------------------ = a-2b^2-4c^3        2abc
May 27, 2016

Calculus
What do you mean by "finding" x,y,z? (x-2)/-1 = (y-5)/5 = (z-7)/7 or x = 2-t y = 5+5t z = 7+7t When x = -3, t=5, so the line passes through (-3,30,42)
May 27, 2016

algebra
I understand csc(A) but have no idea what the Y6 is supposed to mean. If the Y is a typo, then I suppose you could have meant 3csc(A)-6=0 csc(A) = 2 or, if you prefer, sin(A) = 1/2 A = pi/6 or 5pi/6
May 27, 2016

math
C cannot be right, since it only has two terms. Take another stab at it and see whether you can come up with (A)
May 27, 2016

math PsyDAG
well, 1.1*3 = 3.3 so A and B are clearly wrong. when multiplying, add the powers.
May 27, 2016

Geometry
good work
May 27, 2016

MATH - CALC
f = x^3-3x^2 = x^2(x-3) f' = 3x^2-6x = 3x(x-2) f" = 6x-6 = 6(x-1) Now just apply the features you know: f=0: x-intercepts x=0: y-intercept f'=0 ==> critical point f"=0 ==> inflection f'>0 ==> increasing f">0 ==> concave up
May 27, 2016

math plz help
let's do the math in base 10. 325 = 1710 1314 = 2910 x+y+z = 3*17 = 51 x+y = 29 now you can get z, and convert to base 6.
May 27, 2016

math
well, the apothem is 1/2 as long as a side, right? doesn't matter whether it's inscribed in a circle.
May 27, 2016

math
75/.06
May 27, 2016

math
cost = 2400/12*15 revenue = 1350*4 + (2400-1350)/5*8 % gain or loss = ((revenue-cost)/cost - 1)*100
May 27, 2016

maths
whoa - too many = signs!
May 26, 2016

math
by now I'm sure you have figured out what it means to substitute a value, but just in case, that gives you 15+9d = 69 Now you can get d, and thus a+3d.
May 26, 2016

Calculus
dy/dx = √[(x^3)(y)] dy/dx = x^(3/2) y^(1/2) y^(-1/2) dy = x^(3/2) dx y^(1/2) = 1/5 x^(5/2) + c Now if you square both sides, you do not get x^5/25 + c, since (a+b) is not a^2+b^2 But proceeding to find c, √2 = 1/5 + c c = √2 - 1/5 Now square both sides and ...
May 26, 2016

Math
just see which pair of values does not work. replace x and y with the values given: -4(-9)-9 = 36-9 = 27 so it is a solution now try the others.
May 26, 2016

Math
f" < 0 indicates it is concave down. f' > 0 means that the graph is rising. So, an example would be a parabola which opens downward. So, the tangent line at x=0 will be above the curve. draw a graph and it should be clear now.
May 26, 2016

Calculus
right on
May 26, 2016

calc
I find it easier to leave the π in the answer. That way it's exact, instead of some decimal approximation. In any case, I got (a) 20π/9 (b) 125π/27 #2 27π/2
May 26, 2016

calc
#1 (a) discs ∫[0,5] π((5-y)/3)^2 dy (a) shells ∫[0,5/3] 2πx(5-3x) dx (b) shells ∫[0,5] 2π(6-y)(5-y)/3 dy #2 discs ∫[0,9/4] π(((3+√(9-4x))/2)^2-(((3-√(9-4x)))/2)^2) dx shells ∫[0,3] 2πy(3y-y^2) dy
May 26, 2016

Math
draw a side view. r^2 = 6^2 + 4^2 A = 4pi r^2
May 26, 2016

Math
Recall Euler's Formula: V+F-E=2 and check out https://en.wikipedia.org/wiki/Icosidodecahedron
May 26, 2016

Math-Calc
f = 6x(3-2x)^3 f' = 6(3-8x)(3-2x)^2 f(1) = 6 f'(1) = -30 so, the tangent line is y-6 = -30(x-1) see at http://www.wolframalpha.com/input/?i=plot+y%3D6x%283-2x%29^3,+y%3D-30x%2B36
May 26, 2016

Math topic help
well, your answer is the balance after about 15.6 years, so I suspect it's not right. What did you intend?
May 26, 2016

Math (Vectors)
looks good to me.
May 26, 2016

Math (Vectors)
if they are parallel, then the lengths will be proportional. 10/2 = 5, so the ratios of the other dimensions will also be 5:1
May 26, 2016

Algebra II
No, I didn't answer the question, but I gave you enough information so you could complete the solution. Sorry to be jerk-ish.
May 26, 2016

Algebra II
So, with the triangle drawn as you have said, with the right angle on the x-axis, you just have a scaled up 3-4-5 triangle, with sides 15,20,25. sinX = 15/25 = 3/5 cosX = 20/25 = 4/5 tanX = 15/20 = 3/4 Looks like time to review your basic trig functions and the Pythagorean ...
May 26, 2016

College Algebra/Drug Calculations
just multiply numerators and denominators 5/6 * 2/3 = (5*2)/(6*3) = 10/18 = 5/9
May 26, 2016

Calc-Math
just look up the values on the graph and multiply or divide the numbers.
May 26, 2016

maths-word problem
if the digits are t and u, then 10t+u = 6(t+u)-1 t-u = 1 Looks like 65 to me.
May 26, 2016

maths
the opposite side is √(y^2-x^2) so csc(Ø) = y/√(y^2-x^2)
May 26, 2016

calculus-again frustrated-looking for steve asap
sinh(y)=[(4sinh(x)-3)/(4+3sinh(x))] cosh(y) y' = (25cosh(x))/(4+3sinh(x))^2 cosh^2(y) = 1+sinh^2(y) = 25cosh^2(x)/(4+3sinh(x))^2 so, cosh(y) = 5cosh(x)/(4+3sinh(x)) y' = 5/(4+3sinh(x))
May 26, 2016

calculus-help me sir~steve
L{f'(t)} = sF(s)-f(0) L{f"(t)} = s^2 F(s) - sf(0) - f'(0) Not sure what to do with f(0)=f'(0) since you don't give a value. L{sin(t)-cos(t)} = (1-s)/(1+s^2) Just plug in the expressions and it will all fall out.
May 26, 2016

Math
clearly, 26 * 1.5
May 26, 2016

math
75/.06
May 26, 2016

Math
2^6 = 64
May 26, 2016

maths
If the distance on the ground is x, and the height of the pole is h, h cot40° - h cot60° = 15 x/h = cot60°
May 26, 2016

Saint Hilary
1 1/2 = 3/2 1 = 2/2 (2/2)/(3/2) = 2/3
May 26, 2016

math
figure the probability of each event, then just multiply them together
May 25, 2016

Math
clearly, the size is 800 in^3 The cylinder could be short and wide or tall and thin.
May 25, 2016

math
a=15 a+9d=69 so, find d, and then T4 = a+3d
May 25, 2016

math
try that again. The fractions add up to too much.
May 25, 2016

math
well, the scale is clearly 6in : 3 ft = 2in:1ft surely you know how to figure perimeter and area
May 25, 2016

math
just divide the miles by the minutes
May 25, 2016

math
think of the six faces: top and bottom two pairs of rectangular sides
May 25, 2016

math
convert to rectangular form add up the x- and y-components convert back to magnitude and direction
May 25, 2016

math
only one, since 6^2 + 8^2 = 10^2
May 25, 2016

Math
1.48 * 250 = ?
May 25, 2016

math
well, add them up and you have 15x+14 = 180
May 25, 2016

math
both the sum of the equations ??
May 25, 2016

Pre-Cal
set u = x^(2/3) then you have u^2-9u+14 = 0 (u-2)(u-7) = 0 so, that means x^(2/3) = 2 x^(2/3) = 7 I expect you can handle that, now...
May 25, 2016

Pre-Cal
pre-cal? Try Algebra I (ax+b)/(cx+d) = 6 ax+b = 6(cx+d) ax+b = 6cx+6d ax-6cx = 6d-b (a-6c)x = 6d-b x = (6d-b)/(a-6c)
May 25, 2016

Algebra II
it's a right triangle so use the Pythagorean Theorem. If the other leg is x, then (5√3)^2 + x^2 = (x+2)^2
May 25, 2016

math-need sir-steve badly asap
well, just use the definition. F(s) = ∫ e^(-st) f(t) dt multiply that by e^(kt) and you now have ∫ e^(-(s-k)t) f(t) dt
May 25, 2016

Math
2x^2+6x-7x+8-3x^2+1 2x^2-3x^2 + 6x-7x + 8+1 -x^2-x+9 4x^2+3x-3 4,3,-3 Typo somewhere (7x^2-x-2)-(6x^3+3) 7x^2-x-2-6x^3-3 -6x^3+7x^2-x-5 6t-2 + 9t-6 15t-8 (1.4*10^1)(8*10^4) (1.4*8)* (10^1*10^4) 11.2 * 10^5 1.12 * 10^6 #18C ok 4k^2(-3k^2-4k+5) 4k^2(-3k^2) + 4k^2(-4k) + 4k^2(5...
May 25, 2016

Math
#7 has a typo. Either A or B would work, depending on what it was. No ideas on any of the others?
May 25, 2016

Algebra II
surely you know (a) what a reciprocal is (b) what a sum is (c) what consecutive integers are So, if the smaller integer is x, the equation is just 1/x + 1/(x+1) = 17/12 Unfortunately, I detect a typo. Fix it, and it will come out a lot better.
May 25, 2016

Math
can't tell when no function is given.
May 25, 2016

math
you know all three angles, so use the law of sines to find the ratio of the sides. Then just pick lengths that add to 12.5
May 25, 2016

math
either that, or "pitcher" is the wrong word to use. In any case, just add the two numbers. Since you want the answer in "simplest form," I suspect Ms. Sue is right, and you have garbled your fractions.
May 25, 2016

Math/ ratios/ Fractions/ Singapore Math
h+r = 60 (3/4 h)/(r-5) = 1/2 now just find h and r. Not sure just what the question is asking. More than when he ended, or more than Holly?
May 25, 2016

physics
just solve (39.2 sin 30°)t - 1/2 gt^2 = 14.7 You haven't specified the units, so I don't know what value g has.
May 25, 2016

Math
3x - x = 34
May 25, 2016

Pre-Calc
correct
May 25, 2016

math
naturally, that would be 16 * 1.15 * 100/12
May 25, 2016

math
original fraction: (d-6)/d adding 2, we have (d-4)/(d+2) = 3/5 ...
May 25, 2016

Maths
there are some good online calculators for this
May 25, 2016

math
.35 * 475 = ?
May 24, 2016

Math-Calc
Draw a side-view diagram. If the water is at depth y, then the surface of the water has radius 325/800 y. Thus the volume is v = 1/3 pi (325/800 y)^2 y = 0.1729 y^3 dv/dt = 0.5187 y^2 dy/dt Now just plug in your numbers. If water is being pumped in at c cm^3/min, then c-14000...
May 24, 2016

geometry
they are equal, but not necessarily the same as the other two distances.
May 24, 2016

Math
well, shoot. Look from the side. Draw a sloping line representing the ground. Place a vertical line on the slope somewhere. Label the top T and the bottom B. That is the pole. Label its length 20. Mark two points on the slope, equal distances from the pole. Label those ...
May 24, 2016

math
Since A = WL, L=A/W x^3y^4 / x^2y = xy^3
May 24, 2016

simultaneous-equation help am despirate
2x+y-z=8 x^2-y^2+2z^2=14 3x^3+4y^3+z^3=195 See whether it helps to rewrite it like this x+y + x-z = 8 z^2+x^2 + z^2-y^2 = 14 4(x^3+y^3) + z^3-x^3 = 195
May 24, 2016

Algebra
2*41 + 8x = 7(41+x) it's going to take a lot of $8 nuts to bring the price up to $7/lb from $2/lb.
May 24, 2016

maths
well, 5% of 31348 is 1567.4 That leaves her 3084.6 feet to go. And as you know, time = distance/speed
May 24, 2016

Pre-Calc
that is correct. There is a hole in the graph at x=4, because there f(x) = 0/0 which is undefined. f(x) = 1/x everywhere except at x=4.
May 24, 2016

Precal/math
you have to find g(0). Then use that value to evaluate f.
May 24, 2016

algebra
recall that (a-b)(a+b) = a^2-b^2 (x+3)/(√2-3x) * (√2+3x)/(√2+3x) = (x+3)(√2+3x)/(2-9x^2) or something, depending on whether you were sloppy with your parentheses.
May 24, 2016

Calculus
how advanced is "advanced"? trig substitution? polynomial roots? try and meet us halfway here. Surely your text has examples where u has been substituted for some expression. Do something similar. Then tweak some constant so the answer comes out 6.
May 24, 2016

math
sec(θ)/(csc(θ)-cot(θ)) - sec(θ)/(csc(θ)+cot(θ)) becomes sec(θ)(csc(θ)+cot(θ)) - sec(θ)(csc(θ)-cot(θ)) ---------------------------------------------------------- (csc(θ)-cot(θ))(csc(θ)+cot(θ)) Now ...
May 24, 2016

MATHS
24.5*13*4 * 7.48 * 0.80
May 24, 2016

trigonometry
sec(θ)/(csc(θ)-cot(θ)) - sec(θ)/(csc(θ)+cot(θ)) becomes sec(θ)(csc(θ)+cot(θ)) - sec(θ)(csc(θ)-cot(θ)) ---------------------------------------------------------- (csc(θ)-cot(θ))(csc(θ)+cot(θ)) Now ...
May 24, 2016

MATHS
You appear to be adding, not subtracting. Also, 3/4 - 1/2 = 1/4 so the answer cannot be a whole number.
May 24, 2016

geometry(is this right?)
(-3,1)x4 = -12,4 (-1,4)x4 = -4,16 (2,3)x4 = 8,12 (4,-3)x4 = 16,-12 Not sure how you cam up with those other bizarre answers
May 24, 2016

Math
I suspect a typo. The difference cannot be more than 9, so the number must be at most 18. It is even, so the only candidates are 10 12 14 16 18 None of those works.
May 24, 2016

math
that's better
May 24, 2016

math
#1 nope. Odd, since you got it right in your previous post. #2 same comment #3 ok #4 nope - subtract powers when dividing #5 same comment #6 nope. Odd, since you got #3 right #7 ok #8 nope. look carefully. write out the products if you must. see what cancels in the division. ...
May 24, 2016

math
both ok. good work.
May 24, 2016

MATHS
Looks like #3,6 to me since |a| > |b| and b<0, c is positive and between b and a.
May 24, 2016

Mathematic
in principle, it would be either 2950(1+.0810*1.5) or 2950(1+.0810)^(1.5) but, if it accrued annually, you will not yet have received the interest for the 6 months of the 2nd year. As you see, it can get complicated.
May 24, 2016

math
t = 7s s is independent. The total cost depends on the number of students attending.
May 24, 2016

@Reiny
oh, sure - read the topic carefully. show-off.
May 24, 2016

linear-equations-in-one-variable
If the width is x and the length y, then y = x+4 (x+3)(y+3) = xy+81 Now just solve for x and y. If you expand the 2nd equation, you will see the xy drop out, leaving you with two linear equations in x and y.
May 24, 2016

Algebra
If the plane's speed is p and the wind speed is w, then we have 14(p-w) = 3024 9(p+w) = 3024
May 24, 2016

Algebra
c+a = 2200 1.50c + 4.00a = 4550.00
May 24, 2016

Algebra
I assume you want to know how many miles in city and highway. Well, take a look at the data: miles = gals * mi/gal so total miles: 15.867*15 = 238 If there were c city miles, then the rest (238-x) were highway miles. So, x/13 + (238-x)/30 = 15.867 x = 182 so, 182 city miles 56...
May 24, 2016

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