Thursday
July 28, 2016

Posts by STEVE

Total # Posts: 42,130

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

Algebra
since distance = speed * time, 3(x+3) = 7(x-3)
May 24, 2016

math
(80000-50000)/50000 = 3/5 = 60%
May 24, 2016

algebra
however, assuming you meant y = -1/3 x + 1/2, if you rearrange things you have 6x + 18y = 9 1/3 x + y = 1/2 or 6x+18y = 9 2x+6y = 3 you can see that they are the same line.
May 23, 2016

Math
don't you have the formula? Just plug in your numbers and we can check your answer.
May 23, 2016

Math
correct.
May 23, 2016

Math
rearrange things to a single format: x+6y=4 2x+12y=8 Now you can see that they are really the same line.
May 23, 2016

Math
well, you must have tan2x = 0 or sinx = 1 so, you are almost right. tan2x=0 if 2x = 0 or π or 2π or 3π so, x = 0, π/2, π, 3π/2 sinx = 1 if x = π/2, so that does not add any solutions to the list.
May 23, 2016

Math
If all the numbers are expressed as multiples of 10^-7, they are a: 620 b: 12.3 c: 52000000000 d: 370 should be a bit easier now, eh?
May 23, 2016

College Algebra math
35 + √(37^2 - 35^2)
May 23, 2016

pre algebra Is it A,B,C or D?
where did you come up with 3/11? tossing the coin and picking a letter are independent events, so the theoretical probability is just 1/2 * 1/5 = 1/10
May 23, 2016

Geometry
well, s = rθ
May 23, 2016

Pre algebra Am I right??
looks good to me
May 23, 2016

math
A farmer has dogs and chickens running around in his backyard. There are a total of 36 animals, and the farmer counts a total of 56 legs. The farmer can use a system of equations to determine how many of each animal there are. He claims that one of the equations in the system ...
May 23, 2016

Math
C: 3 is prime and odd
May 23, 2016

ALGEBRA
nope. You have to account for both events. P(odd) = 3/4 P(even) = 1/4 so, P(odd,even) = 3/4 * 1/4
May 23, 2016

Algebra
11 bills in all The two bills must be 5,20 or 20,5 p = (2/11 * 4/10) + (4/11 * 2/10) = 8/55
May 23, 2016

Algebra
correct
May 23, 2016

Math
for the product to be even, you must have either m even or m+p even A works, because odd+odd is even B fails -- odd*odd = odd C works whether p is even or odd, so it's not true that p must be even. D the same
May 23, 2016

Math
so did I
May 23, 2016

Math
yes it would
May 23, 2016

Math
right on.
May 23, 2016

Math (Vectors)
if the angle A is drawn in the standard position, tan(A) = y/x
May 23, 2016

MATHS TRIGONOMETRY
you have sinθ = 2/3 if sin and cos are both positive, then θ is in QI. So, now draw the triangle. y = 2 r = 3, so x = √5 Now just use those values and the fact that sinθ = y/r cosθ = x/r tanθ = y/x to answer the questions. The last one should be ...
May 23, 2016

math
rearranging things a bit, you have 3y^2 - y - 6 = 0 y = (1±√(1+72))/6
May 23, 2016

math hurry
1 nope. subtract exponents when dividing 2 nope. same reason 3 nope. 4^-2 = 1/4^2 = 1/16 4 nope. using the logic of the first 3 problems, 5^0 = 5^1/5^1 = 5/5 = 1 any number to the zero power is 1. #6 I suspect a typo, as they are all wrong #7 B (But I suspect that you did it ...
May 23, 2016

Math Can you help me?
gains are positive, losses are negative, so he ends up at 0+7-4+12 = 15
May 23, 2016

math
certain superstores will often price match or even beat a competitor's price by 10%.the function g(x)=0.90x represents the sale price of a piece of merchandise at such a superstore.the function f(x)=0.13x represents the HST owed on a purchase with a selling price of x ...
May 23, 2016

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