Wednesday
July 27, 2016

Posts by STEVE

Total # Posts: 42,113

Maths
did this yesterday: http://www.jiskha.com/display.cgi?id=1467998179
July 9, 2016

Math
The line segment touches bot the x- and y-axes at all times. So, the point p is 3 units away from the x-axis, along the line. So, let the line make an angle θ with the x-axis (measured clockwise). Then picture point P as being at the end of a rod of length 7, which slides...
July 9, 2016

math
20-6-5 = 9 P(yellow) = 9/20
July 9, 2016

math
well, 5^2 = 25
July 9, 2016

discrete math
(g◦f) = g(f) = f^2-2 = (2x+1)^2-2 (f◦g) = f(g) = 2g+1 = 2(x^2-2)+1 x=4f/(2f-1) 2xf-x = 4f f(2x-4) = x f = x/(2x-4) So, the range of f is all reals except x=2. The domain is all reals except 2 and 1/2. The domain of f^-1 is the range of f. The range is all reals ...
July 9, 2016

number magic(math)
The length plus the width = 6 so, how many pairs of integers add up to 6? If you are not restricted to integer values, then there is no limit to how many you can draw.
July 9, 2016

math
usually quantities are not negative values, right?
July 9, 2016

algebra
Add: x-2y+3z = 7 -x+y-2z = -4 --------------- -y+z = 3 Add #2 and 4*#3: 4x+5y+z = -1 -4x+4y-8z = -16 ------------------- 9y-7z = -17 Now you know that z = y+3,so 9y-7(y+3) = -17 9y-7y-21 = -17 2y = 4 y = 2 so, z = 5, x = -4
July 9, 2016

Maths
same as always: clear the fractions to get nr = (r+20)(n-10) nr = (r-4)(n+10) nr = nr + 20n - 10r - 200 nr = nr - 4n + 10r - 40 20n-10r = 200 4n-10r = -40 or, 2n-r = 20 2n-5r = -20 So, r = 2n-20 2n-5(2n-20) = -20 2n-10n+100 = -20 -8n = -120 n = 15 so, r = 10 15 students share ...
July 8, 2016

Maths
If each of n students gets r rupees, nr/(n-10) = r+20 nr/(n+10) = r-4 Now just solve for r and n.
July 8, 2016

Math
there is no average cost. The cost of the items does not change. 3s+8c = 29 8s+3c = 15 11s+11c = 44 Multiply by 2/11 and you have 2s+2c = 8
July 8, 2016

Chemistry
convert each to moles. Write the balanced equation. The reagent with the smaller moles used will limit the reaction. So, figure the moles produced, and convert back to grams.
July 8, 2016

Math
well, x is 4, so just substitute 4 for x and evaluate, to get y. y = 2*4+3
July 8, 2016

Maths
3/2 (2a + 2d) = 48 (a)(a+2d) = 252 a = 16-d, so (16-d)(16-d + 2d) = 252 Now just solve for d
July 8, 2016

Algebra
h+2s = 5.40 3h+s = 8.70 Now just solve for h and s.
July 8, 2016

maths
42
July 8, 2016

Science
You need 0.1 moles for 1L of diluted acid. The concentrated acid has 1.15 moles per liter. So, you need 0.1/1.15 = 0.087 liters of the concentrate. or, 87 ml
July 8, 2016

English
how can one letter indicate an order?
July 8, 2016

Science
h/(500*15) = 1/2 Review the properties of a 30-60-90 right triangle.
July 8, 2016

discrete math
Get out your atlas and look them up. (c) Miri is located in Sabah false, since both are cities in Malaysia
July 8, 2016

math
You have y^2 = 4x This is just the standard equation y^2 = 4px with p=1. Check your book or online for properties of parabolas. You can start here if you wish: http://www.wolframalpha.com/input/?i=parabola+y%5E2+%3D+4x
July 8, 2016

Math
use the distributive property 8a+2a = (8+2)a = 10a just as 8 books + 2 books = 10 books $8 + $2 = $10 and so on.
July 8, 2016

Physics
distance is just 5+8 Use the distance formula (Pythagorean Theorem) to figure the displacement.
July 8, 2016

Maths
done http://www.jiskha.com/display.cgi?id=1467924046 You might check your previous posts before wasting everyone's time posting it all over again...
July 8, 2016

Chemistry
well, how many moles of CH4 is 16g? clearly, 4 times that many atoms of H. But, hydrogen comes as H2, not just H, so divide that by 2.
July 8, 2016

math
apparently you have a 5-digit number xxxxx my tens digit is 7 xxx7x My hundreds digit is 4 less than my tens digit xx34x Now just work your way from there, using the facts given.
July 8, 2016

physics
since R varies as L/A, changing L to 2L requires that we also change A to 2A, since L/A = 2L/2A
July 8, 2016

math
84/(4*60) = 84/240 you can reduce that if you want
July 8, 2016

math
R = {(2,3),(2,9),(3,2),(3,4),(4,3),(4,9),(9,2),(9,4)}
July 8, 2016

chem
google is your friend. Type in your question and you can read many explanations of why this is so.
July 8, 2016

VECTOR HELP URGENT
|a × b| = |a| * |b| * sinθ just plug in your numbers!
July 7, 2016

PreCalculus 1
(a) since Coco can be anywhere on the line y=3, you want the closest that the spider can get to that line. Since sin(t) has a minimum value of -1, y(t) has a minimum of 4.5, so Coco can never get closer than 1.5 ft to the spider. (b) The spider's distance is z^2 = x^2+y^2...
July 7, 2016

precalc
(fog) = f(g) = 2g^2-5 = 2(x+4)^2-5 now just expand that out Now just plug in x=3 for (b).
July 7, 2016

precalc
this is very like the others. By this time you should have some idea how to do them. If you get stuck, some back with your work.
July 7, 2016

precalc
yes, it is.
July 7, 2016

Math
v(t) = v - 9.8t v(0.35) = 0, so initial v = 3.43 Her height y = 10 + 3.43t - 4.9t^2 So, solve for t when y=0
July 7, 2016

physics
the horizontal force is 58 cos27° F = ma so, plug in your numbers and solve for a.
July 7, 2016

Algebra
since distance = speed * time if x is the boat's speed and y is the water's speed, we have 4(x+y) = 48 6(x-y) = 48 Hint: 48 = 4*12 = 6*8
July 7, 2016

Algebra
count the tickets: g+s = 215 count the dollars: 10g+6s = 1990 Now crank it out.
July 7, 2016

Geometry
rewrite as y = 2x-3 and you can read off the slope and intercept
July 7, 2016

Pre-Cal
oops sinx = 8/17 so, cosx = 15/17 sin2x = 2 sinx cosx = 2 * 8/17 * 15/17 = 240/289
July 7, 2016

Pre-Cal
sinx = 8/17 so, cosx = 15/7 sin2x = 2 sinx cosx = 2 * 8/7 * 15/7 = 240/49 do the others similarly.
July 7, 2016

Algebra
Huh? It's already written out. That's how I got the equation. Can you not solve the equation? If you find x, that's how many lbs of worms you need. The rest (30-x) is bears.
July 7, 2016

Algebra
If x lbs of worms, then 7x + 3(30-x) = 4.60*30 This is just like the interest problem, which is also a mixture problem.
July 7, 2016

Pre-Cal
recall that tan(x-y) = (tanx-tany)/(1 + tanx tany)
July 7, 2016

Algebra
If $x is at 8%, then .08x + .09(10000-x) = 860
July 7, 2016

Physics - tense
I'm waiting for the answer here... Talk about tension!
July 7, 2016

Maths
Yeah, I noticed that. I can't figure why the closest answer is so far off. To get 12.2 years, r needs to be 9.58%
July 7, 2016

geometry
review your basic trig functions, and from a distance of x feet, 1149/x = tan 89° Now just solve for x.
July 7, 2016

Calculus
recall that the range of an object is R = v^2/g sin2θ so, figure some pairs of value that make that 100 miles. Of course, that formula implies a flat earth, and 100 miles is far enough away that varying gravity and earth's curvature require some modifications.
July 7, 2016

Maths
For n sides, there are n-2 straight angles, or 2(n-2) right angles. So, n=17
July 7, 2016

MATH Function Transformation
If you mean a polynomial such as a(x-p)(x-q)(x-r)... then a is the vertical scale value, so a = 1/2 means the y values are half as big: a compression ratio. stretching and compression are just two ways of looking at a scale factor. Usually a compression means a < 1 and a ...
July 7, 2016

Math
75 min = 1.25 hours, so 15.4mi/1.25hr = 12.32 mi/hr
July 7, 2016

math
that is one way. The other way is to use the Remainder Theorem and evaluate f(1). That is the remainder R.
July 7, 2016

Math Please Help
you just want d(t) > -16 t^3-9t^2+6t > -16 t^3-9t^2+6t + 16 > 0 (t+1)(t-2)(t-8) > 0 Now, using what you know about the general shape of cubics, you know that this one will come up from the lower left, then cross the t-axis at -1,2,8. Since it started out negative, ...
July 7, 2016

math
review your basic trig functions: h/450 = tan 20°
July 7, 2016

algebra2
If there are x cows and y chickens, you know (counting heads) x+y = 35 Now, counting legs, you know: ??? Work that out, then solve the two equations.
July 7, 2016

AB Calculus
Assuming all logs are base b (since the base does not matter for this kind of stuff), we have (I think) log ∜(x^7 y^2 / z^4) = 1/4 log(x^7 y^2 / z^4) = 1/4 (7logx + 2logy - 4logz) = 7/4 logx + 1/2 logy - logz or, (b)
July 7, 2016

math
Since y has an absolute maximum, it must be of even degree, since all the odd-degree polynomials go forever in each direction. And, its leading coefficient must be negative, since the graph opens downward.
July 7, 2016

Maths
Since multiplying logs is not one of the usual operations, and none of the answers includes (x-6) I'd say you are in trouble from the start. I suspect that you were given -2logb^x -6logb^y + 1/7 logb^z That is choice (a), assuming the usual sloppiness with notation.
July 7, 2016

math
A little synthetic division shows that the remainders are -9m-92 and 23-4m If they are equal, then m=-23 P(-3) = P(2) = 115
July 7, 2016

Advanced Function
the volume increases by the cube of the linear scale. So, he needs a scale factor of no more than ∛9 = 2.08
July 7, 2016

geometry
well, you know that m∠ABE is half of the total, since BE bisects ∠ABD.
July 7, 2016

Maths
What's to figure out? They gave you the exact formula you need. 9% growth means it grows by a factor of 1.09 each year, so t = ln3/ln1.09 = ?
July 7, 2016

General Mathematics
8 + 1.5*ceil(x) for x km above 4. where ceil(x) (ceiling function) is the least integer greater than or equal to x.
July 7, 2016

Algebra
110*55 = ?
July 7, 2016

Science
30√2 SW is the same as 30S and 30W So, now add up all your distances and see where you end up. The answer will be surprisingly easy.
July 7, 2016

geometry
(B+b)/2 * h fill in the values
July 7, 2016

math
Not always. Never for rectangles.
July 7, 2016

AHOOGAAH! Homework Dump
No ideas on any of these?
July 7, 2016

Math
(3 + (2/3)(-3-3),(2 + (2/3)(5-2)) = (3-4,2+2) = (-1,4)
July 7, 2016

Math
well the slope of the line between (-2, -1) and (6, 8) is (-1-8)/(-2-6) = 9/8 now use the point-slope form of the line
July 7, 2016

Calculus
Let u = tan(π/4 sin(2x)) du = sec^2(π/4 sin(2x))*(π/4)(2cos(2x)) du So, what you have is just ∫du with some constant factored out.
July 7, 2016

General Math
since pure juice is 100% juice, add up the amounts of juice: .50(6) + 1.00(x) = .75(6+x)
July 7, 2016

physics PS
Oops -- v = 2/3 t^3 i + 2/3 t^2 j
July 7, 2016

kashinath palod
FF = ma = 6t^2i + 4tj Since m=3, a = 2t^2i + 4/3 t j so, v = 2/3 t^2 i + 2/3 t^2 j
July 7, 2016

Calculus
well, sin^2(x) = 1/2 (1-cos(2x)) that should be easy to integrate, right?
July 7, 2016

maths
I have never heard of the word kharch, but the apple's share is 5/(6+10+5) = 5/21
July 7, 2016

math
well, ADB is also an isosceles right triangle with sides of 5. So, its hypotenuse is AB = 5√2 that help?
July 7, 2016

Math
Well, the 1st term in the rth group is 1,2,4,7,11,... = 1+ 0,1,3,6,10 = 1+ r(r-1)/2 That should get you started.
July 7, 2016

Math
looks good
July 7, 2016

pre cal
6(x^2 - 2/3 x + 1/9) = 6(x - 1/3)^2
July 7, 2016

Pre-Cal
(csc θ − sin θ)/(cos θ) = (1/sinθ - sinθ)/cosθ = (1-sin^2θ)/(sinθ cosθ) = cos^2θ/(sinθ cosθ) = cosθ/sinθ = cotθ
July 6, 2016

Pre-Cal
(sin^2 + cos^2)/cos = 1/cos
July 6, 2016

java program
letter = (n>=90) ? "A" : (n>=80) ? "B" : (n>=70) ? "C" : (n>=60) ? "D" : "E";
July 6, 2016

Algebra
check the slopes. If their product is -1, the lines are perpendicular. That is, if one slope is the negative reciprocal of the other.
July 6, 2016

Math
Thunk of it using actual numbers. If he can mow the lawn in 4 hours, how much in 2 hours? 2/4 So, it will take him 2/x hours. If it takes him x hours, he does 1/x of the job in 1 hour. So, twice that, or 2/x in 2 hours.
July 6, 2016

math
ever hear of actual math symbols? 3√5 - 2√7 + √245 - √28 3√5 - 2√7 + √(49*5) - √(4*7) 3√5 - 2√7 + 7√5 - 2√7 10√5 - 4√7
July 6, 2016

MATH HELP
In 30 minutes, the first bus has gone 39 miles The 2nd bus goes 15 mi/hr faster. So, how long does it take to cover the extra 30 miles? It's the same as if the 1st bus stopped 30 miles away, and the 2nd bus drove 15mph to meet it.
July 6, 2016

Chemistry
sure looks like D to me twice the value, opposite direction
July 6, 2016

math
what, you cannot add 600+3200 ?
July 6, 2016

Normal Distribution
you can play around with Z table stuff at http://davidmlane.com/hyperstat/z_table.html
July 6, 2016

math
not sure what the scaling has to do with anything, as the scaled polygon is never mentioned. However, it should be easy to convince yourself that such a scaling does not change any of the slopes or angles involved.
July 6, 2016

Math
yes, it can. Because to be even f(-x) = f(x) This is true only (and always) if all the exponents are even.
July 6, 2016

Math
the highest exponent is the degree the order of a root is the number of times it appears. So, you have three roots of degree 1. Any polynomial of degree n has exactly n roots, though all may not be unique (order 1).
July 6, 2016

algebra 2-1
x=42
July 6, 2016

Pre Calculus
again, only one possible choice, since e^1 = 2.718 e^2 = 7.389 e^3 > 16
July 6, 2016

Pre Calculus
x = 5/2 Now if you mean 2^x = 5 The answer should be clear, since 2^1 = 2 2^2 = 4 2^3 = 8
July 6, 2016

Math
since time * speed = distance, and the two distances are the same, 60t = 70t + 3/2 find t, then use that to get the distance
July 6, 2016

maths
make that 100° (130-30)
July 6, 2016

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