Thursday
January 19, 2017

Posts by Steve

Total # Posts: 47,946

Calculus
when the water has depth y, the surface has with 4/3 y. That means the volume is v = y(4/3 y)/2 * 15 = 10y^2 dv/dt = 20y dy/dt Now just plug in your numbers to find dy/dt
December 10, 2016

Algebra
This is a trick question. |u| is always positive, so |1-4k| ? -11 for any value of k. Damon's solution is correct, but it should read k >= -2.5 OR k <= 3 So, any value of k will work.
December 10, 2016

Math
profit = revenue - cost revenue = price * demand P(x) = x(200-0.5x) - (100+5x+7x^2) = -7.5x^2 + 195x - 100 Now just find the vertex of that parabola.
December 10, 2016

maths probability
I hope he had fun.
December 10, 2016

Math
well, why do you not simply use the formula? i = P((1+r/n)^(nt)-1) and plug in your values?
December 10, 2016

Math
m/n= (m+b)/(n+b) m(n+b) = n(m+b) mn+mb = mn+nb b(m-n)=0 b=0 or m=n The question is poorly explained. It clearly said Does there exist a fraction(s) m/n... so offering a single example would indeed answer the question!
December 10, 2016

Geometry
15-9 < x < 15+9 so (C) is correct. If it were 24, then the triangle would collapse to just a line.
December 10, 2016

Math
4?/3 r^3 = 15000 r^3 = 45000/(4?) r = 10?(45/4?) or 5?(90/?)
December 10, 2016

math
area has the ratios squared, so 2^2:3^2 = 4:9
December 10, 2016

Math.
also 2:3
December 10, 2016

math check my answer please
Just as ?125 = 5?5, ?b^3 = b?b You went a bit astray, so we should have 3?(125a^1b^3) = 3*5b?(5ab) = 15b?(5ab) The 3 does not distribute across products. The distributive property only applies to addition, as in 3(?a + ?b) = 3?a + 3?b
December 9, 2016

soil mechanic
um ?
December 9, 2016

math help
?(48ab^2) = ?48 * ?a * ?b^2 = ?16 * ?3 * ?a * b = 4b?(3a)
December 9, 2016

Math
sorry. You have the equation. Plug in the given x or y value and solve for e or f. You gotta do something here, dontcha? Stop looking for freebies...
December 9, 2016

Math
Assume a straight line. As x increases by 2 (5-7) y increases by 6 (13-19). So try y = 3x But, 13 - 3*5-2. So, try y = 3x-2 it works for all the known pairs. So, fill in e and f.
December 9, 2016

Math
correct.
December 9, 2016

Math
Nope. The slopes are 1 and -1, so their product is -1. That means they are perpendicular.
December 9, 2016

geometry
google is your friend. Try this: https://www.algebra.com/algebra/homework/word/geometry/Angle-bisectors-in-an-isosceles-triangle.lesson
December 9, 2016

Geometry
ABE+ABC = 180, so ABC = 180-ABE ABC = (180-y)/2 so, 180-(3x+20) = (180-y)/2 160-3x = 90 - y/2 70-3x = -y/2 y = 6x-140
December 9, 2016

math
no, m+5m = 6m cm area is m*5m = 5m^2 cm^2
December 9, 2016

math
I don't know what you mean by "solve" it. It's just an expression. No equation. (0.08b^{4m+8})/(18b^{m?2}) = .08/18 b^(4m+8-(m-2)) = 1/225 b^(3m+10) 1/(1/5) m^(4-n) * 1/2 m^(n-6) = 5/(2m^2)
December 9, 2016

Calculus
and ... ?
December 9, 2016

Algebra
Draw the line. It lies in QII, QI, QIV
December 9, 2016

precalculus
divide by -2 ant it changes to r = -2/(1+3sin?) now what do you think?
December 9, 2016

precalculus
since tan?/sec? = sin?, can you handle r sin? = 2 ??
December 9, 2016

Algebra 1
yep.
December 9, 2016

precalculus
the standard equation is r = ep/(1 - e sin?) so, if you divide top and bottom by -2 you get r = -2/(1+3sin?)
December 9, 2016

precalculus
tan?/sec? = sin? so, can you convert r sin? = 2 ??
December 9, 2016

math
if the cuboid has sides x,y,z, then the main diagonal d has length d^2 = x^2+y^2+z^2
December 9, 2016

math
That is really a=p(1+r/n)^(nt) Assuming you mean compounded quarterly, just plug in your numbers, with r=0.043 n=4 t=6
December 9, 2016

Math
f+t = 26 5f+10t = 210
December 9, 2016

Algebra
well, that would be 2/9 * 2493, right?
December 9, 2016

Quadratic Relations, Algebra, Math
solve for h = 0.5 -4.9t^2+14t+2.5 = 0.5 now just use the quadratic formula.
December 8, 2016

math
Cause the exponent is positive you move the decimal point 3 places to the right so that would = 1900
December 8, 2016

Algebra
12.50-8.75=3.75 You have $3.75 left for toppings $1.25*3=3.75 You can have 3 toppings
December 8, 2016

algebra
P = kmT/V (usually written as PV = knRT) Anyway, that means that PV/Tm = k a constant So, you want P such that 180P/(3*280) = (1170*720)/(6*260)
December 8, 2016

MATH MS. SUE
See you tomorrow Ms. Sue I have to go to bed but Ill have those explanations up soon
December 8, 2016

MATH MS. SUE
Yeah, just unsure on 2, and 3
December 8, 2016

MATH MS. SUE
Do you want me to give you an explanation for them?
December 8, 2016

MATH MS. SUE
I did the math silly
December 8, 2016

MATH MS. SUE
Are those correct?
December 8, 2016

MATH MS. SUE
1. B 2. C 3. A 4. A
December 8, 2016

MATH MS. SUE
Alright I don't have any answers in mind but I'd like your help hand me some equations to solve for this
December 8, 2016

MATH MS. SUE
Spare me a second please, Ms. Sue
December 8, 2016

MATH MS. SUE
1. The length of a piece of paper is 8.5 inches. Using scissors, you reduce the length of the paper to 4.25 inches. What is the scale factor of the dilation? A. 1/4 B. 1/2 C. 2 D. 4 2. On a given blueprint, 1 inch = 30 feet. If the dimensions of a meeting room on the blueprint...
December 8, 2016

Diagram
Racist: Please stop bill
December 8, 2016

Diagram
This is a repost from a few weeks ago from someone esle but need help. The ramp shown below is used to move crates of oranges to loading docks at different heights. When the horizontal distance AB is 15ft, the height of the loading dock, BC, is 3ft. What is the height of the ...
December 8, 2016

MATH
2. 3^2 = 9 9*13 = 117 Am I right?
December 8, 2016

MATH
1. = 10*6 = 60
December 8, 2016

MS. SUE HIIII
Equation
December 8, 2016

MATH
1. The sides of a square are increased by a scale factor of 6. The perimeter of the smaller square is 10 ft. What is the perimeter of the larger square? A.10 ft B. 40 ft C. 60 ft D. 120 ft 2. A right triangle has an area of 13 m^2. The dimensions of the triangle are increased ...
December 8, 2016

MATH MS. SUE
Yes you were very much help and I thank you for that
December 8, 2016

MATH MS. SUE
B. $144.04
December 8, 2016

MATH MS. SUE
OK thank you but you didn't help it is divide 157/1.09 = 144.0366...
December 8, 2016

MATH MS. SUE
1. On a recent day, one U.S. dollar was worth 1.09 euros. If you were to exchange 157 euros on that day, how many U.S. dollars would you have received? A. $110.09 B. $144.04 C. $155.91 D. $171.13
December 8, 2016

Math
all real numbers except where t^2+6t+9 = 0
December 8, 2016

MATH MS. SUE
x = 49/10 Thanks Ms.Sue
December 8, 2016

MATH MS. SUE
Hand me over an equation please.
December 8, 2016

MATH MS. SUE
1. Sarah’s mother has a miniature village modeled after her home town. The model is 10 feet long and 7 feet wide. The actual village is 7 miles long. What is the village’s actual width? If necessary, round to the nearest tenth of a mile. A. 4.9 miles B. 10 miles C. 1...
December 8, 2016

Math
it would help if you actually provided a sequence... As long as no x value maps to two or more y values, it is a function.
December 8, 2016

Math
a depth of 4 feet means you need ? [-10,-6]
December 8, 2016

math
Just add up the revenue from each kind of ticket. The total must be 779: 3s+5t = 779
December 8, 2016

Math
8×5+8×1 -2×6+6-2 = 22 hint: 48-26 = 22
December 8, 2016

Math
122.5 sips * 2slurps/7sips * 2gulps/5slurps = ? gulps The units cancel as desired, so just work with the numbers.
December 8, 2016

Algebra
at time t hours, since distance = time * speed, when they have covered the 26 miles, solve for t. 6t + 8(t-1.3) = 26
December 8, 2016

Math
This web site shows how to find the area of the cross-section. Using that, the volume is 40*area. The weight is density * volume. Then you can either integrate to find the work, or just see how high the center of mass has to be lifted, and work = weight * distance. http://...
December 8, 2016

math
when 625-300t = 400-150t
December 8, 2016

Math - Calculus
okay. You seem to be using shells, so you need to be integrating along y, since the shells have a thickness of dy. v = ?[0,6] 2?rh dy where r = y and h = 4-x = 4-y^2/9 v = ?[0,6] 2?y(4-y^2/9) dy = 72? If you want to integrate along x, you need to use discs of thickness dx: v...
December 8, 2016

Trig identities
well, that does make a difference. You just need to think about what happens in the various quadrants. Recall that sin? = y/r cos? = x/r r is always positive, so if sinx is positive, and cosy is negative, that means you are in QII. Now you know that sinx = 3/5 cosx = -4/5 siny...
December 8, 2016

Math (optimization) really confused
As always, in similar problems, the fence is evenly divided into lengths and widths. So, you know right off that 2y=3x. y(2y/3) = 225 y^2 = 675/2 y = 18.37 x = 12.23
December 8, 2016

Math
64 oz = $2.00 divide by 64 to get 1oz = $2/64
December 8, 2016

Math
clearly not D. Using that, p(15) = 60+16 = 75, when the projection states it will be 450 We have a slope (4) and a point (15,450). So, using the point-slope form, we get p-450 = 4(x-15)
December 8, 2016

Trigonometric identities
well, you know that sinx = 3/5 cosx = 4/5 siny = 12/13 cosy = 5/13 Now just use the identity sin(x-y) = sinx cosy - cosx siny
December 8, 2016

MATH
a = 75x b = 50x for x <= 12 50*12+125(x-12) for x > 12
December 8, 2016

h.p.
Tn = (2n-1)(2n+1) = 4n^2-1 so n ?Tk = ?4k^2-1 = 4?k^2 - 4?1 k=1 Now you know what ?k^2 is and ?1 = n
December 8, 2016

science
it lost 20m/s in 25 seconds. So, each second it lost 20/25=0.8 m/s a = -0.8 m/s^2
December 8, 2016

g.p. - homework dump
geez - you ever going to show some of your own work? These slow-mo homework dumps are annoying.
December 8, 2016

Math (related rates) help?
yes - so, try it sin? = y/13 cos? d?/dt = 1/13 dy/dt Now just plug in your numbers. Use the Pythagorean Theorem to figure cos? when y=12.
December 8, 2016

math
1.10(568+102-57) = ?
December 8, 2016

math
B the two lines have different slopes, so they must intersect.
December 8, 2016

h.p.
so, if you have the answer, what are your thoughts on how to get it?
December 8, 2016

h.p.
10
December 8, 2016

Maths
Remember your basic 3-4-5 right triangle. Scale it up by 3 and you have 9-12-15. Now draw your diagram, and all should be clear.
December 8, 2016

Math
you don't say at what point the wheel starts. Let's say that at t=0 the point of interest at the bottom of the rotation. Since cos(t) starts at the top, we know right away that the function will look like y = -cos(kt) The diameter is 18, so the radius is 9, and we now ...
December 8, 2016

MATH
The three vectors form a triangle. So, recall the law of cosines. c^2 = a^2 + b^2 - 2ab cos?
December 8, 2016

Solving inequality Test 29 questions
You don't offer many choices...
December 8, 2016

Maths
After 10 days, there was enough food for 20 days for x students. So, if the number of students grew from x to x+60, it will only last 20x/(x+60) = 20 - 1200/x+60 more days. So, it depends on how many students there were to start with. If there were x at first, then the 20-day ...
December 8, 2016

calculus
Check the graph. Is f'(x)=0 anywhere on the interval? Clearly not, so now you have to figure out why. Is f(-1) = f(1)? Is df/dx defined everywhere on the interval? (check out x=0)
December 8, 2016

Electrical Circuits
well, what is copper's thermal resistance coefficient?
December 8, 2016

maths
check out the angles and distances.
December 8, 2016

Math
well, it took 1/2 hour, so ...
December 8, 2016

Algebra II
If the square has side s, then 4s = 2(x+4 + x) s^2 + x(x+4) = 94 ...
December 8, 2016

geometry
no idea. How are the angles related? What is the diagram being discussed?
December 8, 2016

G.p.
a = 1 r = 1/2 S12 = (1 - 1/2^12)/(1 - 1/2)
December 8, 2016

G.p.
b-a = c-b 1/a^2 - 1/b^2 = 1/b^2 - 1/c^2
December 8, 2016

Math
well, add 'em up: 2 4/8 3 3/8 1 2/8 ------- 6 9/8 = 7 1/8
December 7, 2016

math
(450-45)/450 = ? Or, you can reason that 45 is 10% of 450 that were used, so ...
December 7, 2016

Trigonometry
24.91 @ S36°W
December 7, 2016

MATH, please help
they are in proportion because 8*9 = 6*12 In a proportion a/b = c/d ad = bc
December 7, 2016

Math
12% is about 1/8 so, you need about 8 times the amount.
December 7, 2016

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