Thursday
September 3, 2015

Posts by Steve


Total # Posts: 33,268

English
Id the 2 adjectives. Argyles are patterned socks named after a Scottish clan. My answer patterned & Scottish
August 13, 2015

Sociology
thank you
August 13, 2015

Sociology
Understanding what is required to test theories? a- reason b- imagination c- validity research my answer is d
August 13, 2015

math
(6*42)/36 = 7
August 13, 2015

Applied Geometry
The area of an equilateral triangle with sides of 3 is 1/4 * 3^2 * √3 So, the volume of the pyramid is 1/3 (9√3/4)(4) = 3√3 = 5.2 You are correct.
August 13, 2015

Geometry
Nope. The whole circumference is 2πr = 16π
August 13, 2015

Maths
ok. now what?
August 13, 2015

Maths
do you mean 4√(132/143) - 2 or ∜(132/143) - 2 Not sure what "by" means here. Either way, there's not much that can be simplified. 132/143 = 11*12 / 11*13 = 12/13
August 13, 2015

maths
s/3 + 3t/4 = 30.5 2t = 6(j-s) j=34 solve that and you have s=24 t=30
August 13, 2015

Math
Just write down in symbols what they told you. If there are a apples and p pears, then a+p = 450 (1/2)a + (3/4)p = 265 a=290 p=160 a-p = 130
August 13, 2015

math
Which ways can two of the 15 coupons total $10? 2+8 5+5 8+2 P(2,8) = 5/15 * 2/14 = 1/21 P(5,5) = 2/15 * 1/14 = 1/105 P(8,2) = 2/15 * 5/14 = 1/21 Add up the ways and you get 11/105
August 13, 2015

math
20*15*6.00 = ?
August 13, 2015

Arithmetic progession
a+2d = 10(a+d) a+6d = 7a Solve for a and d, and then you can find the sum of T8+T15 = (a+7d)+(a+14d)
August 13, 2015

MATH
well, since there are 360° for 24 hours, every hour is 15° of longitude. The latitude does not matter.
August 13, 2015

Urgent math
well, finding the first six terms is easy, right? An = 5n^2-1, so here's a table: n An 1 5*1^2-1 = 5-1 = 4 2 5*2^2-2 = 20-2 = 18 3 5*3^2-3 = 45-3 = 42 4 5*4^2-4 = 80-4 = 76 5 5*5^2-5 = 125-5 = 120 6 5*6^2-6 = 180-6 = 174 Now just add 'em up to get S6
August 12, 2015

Calculus
just to get rid of pesky decimals. Fractions are exact; decimals can often be only an approximation, as in 2/3 = 0.666...
August 12, 2015

Math
If there were c correct answers, then there were 10-c wrong answers. So, now use her score to find c: 5c - 2(10-c) = 29
August 12, 2015

Math (Calculus)
you need both the product rule and the chain rule. f(x) = (3x)(x^2+4)^-1 f'(x) = (3)(x^2+4)^-1 + (3x)(-1)(x^2+4)^-2(2x) = 3/(x^2+4) - 6x^2/(x^2+4)^2 = (3(x^2+4)-6x^2)/(x^2+4)^2 = (12-3x^2)/(x^2+4)^2 The quotient rule produces the same result; in fact, you can see the ...
August 12, 2015

math
time of truck: 15:24-12:00 = 204 minutes time of flight: 3:24-1:48 = 96 minutes So, if the truck's speed was x km/hr, we have (x km/hr)(204 min) = (170 km/hr)(96 min) x = 170*96/204 = 80 You could convert everything to m/s, or use fractional hours or something, but if you ...
August 12, 2015

Math
If you google images for "ruler" you will find many images. Some have an inch divided into 16 parts, and some into only 8 parts. If you remember that 1/8 = 2/16, you should have no trouble getting what you want.
August 12, 2015

Geometry
If BC=2y and CD=2x, note that triangles ADF, ECF, and ABE are all right triangles with one leg half of a side of the rectangle. We know that ABCD has area (2x)(2y) = 72, so xy=18. ADF has area (2y)(x)/2 = xy = 18 ECF has area (y)(x)/2 = xy/2 = 9 ABE has area (y)(2x)/2 = xy = ...
August 12, 2015

Algebra
If there were c correct answers, then there were 10-c wrong answers. So, now use her score to find c: 5c - 2(10-c) = 29
August 12, 2015

alegebra
AP: T1 = a T3 = a+2d T9 = a+8d GP: T1 = a T2 = ar T3 = ar^2 a+6d = 14 a+2d = ar a+8d = ar^2 Solve all that and you find a=2 d=2 r=3 T20 of the AP is 2+19*2 = 40 Check: AP: 2 4 6 8 10 12 14 16 18 20 ... GP: 2 6 18 ...
August 12, 2015

Algebra 2
You know that y=5x+2 has slope 5. Now just use the point-slope form of the line: y+3 = 5(x-1) You can massage that into one of your choices, if it's not already there.
August 12, 2015

Algebra ASAP
P: 3^(2n)-1 is a multiple of 8 P(1): 3^2-1 = 8. True Assume P(k). Then with n=k+1, we have 3^(2(k+1))-1 = 3^(2k+2) = 3^(2k)*9 - 1 = 3^(2k)*8 + 3^(2k) - 1 but, we know that 3^(2k)-1 is a multiple of 8, say, 8m. Then we have =8(3^(2k))+8m = 8(3^(2k)+m) which is a multiple of 8. ...
August 12, 2015

pre-cal
The term containing x^k in (x+z)^n is C(n,n-k)x^(n-k)z^k. So, we have C(10,5)(x^5)(2y)^5 = 8064 x^5 y^5
August 12, 2015

math
(a+b)^2 = 49 (a-b)^2 = 16 (a+b)^2 - (a-b)^2 = 4ab = 33 so, ab = 33/4
August 12, 2015

algebra 1
As written, f(x) = 5x-1 So, you will have a shifted f as g(x) = f(x-13) = 5(x-13)-1 = 5x-66 If, however, your function is f(x) = 5(x-1), then the shifted function is g(x) = f(x-13) = 5((x-13)-1) = 5(x-14) You gotta learn how to use parentheses!!
August 12, 2015

Counting and Probability
Take a look in each hundred numbers starting with the digit x: x10 x20 ... x90 - 9 of them x21 x31 ... x91 - 8 of them ... x98 - 1 of them 9+8+...+1 = 45 So, in each hundred numbers there are 45 that have the tens greater than the ones.
August 12, 2015

math
Clearly the equation is wrong. If a = π/4, we have sina = cosa = 1/√2 and the equation is 1/8 + 1/8 - 1/8 = 1 - 2(1/2) which is false.
August 12, 2015

Math
If the number is ab, then we have 2(a+b) = b+19 10b+a = 10a+b - 18 Now solve for a and b, and you see that the number is 75
August 12, 2015

algebra
any value of r such that 0 < 1+r < 1 will work. That is, -1 < r < 0 In other words, r is negative, but not by much. That is, (1+r) is a positive fraction, so as x increases, the value of A(x) gets smaller and smaller
August 12, 2015

Math
(j/2) = (j/k)(k/2) = (32)(3/4) = 27
August 12, 2015

pre-cal
In Pascal's Triangle, the coefficients on the 5th row are 1,5,10,10,5,1 So, (x-y)^5 = x^5 + 5(x^4)(-y) + 10(x^3)(-y)^2 + 10(x^2)(-y)^3 + 5x(-y)^4 + (-5)^5 = x^5 - 5x^4y + 10x^3y^2 - 10x^2y^3 + 5xy^4 - y^5
August 12, 2015

probability
well, they tell you that the probability that the archer hits the target exactly r times in n attempts is given by the term containing p^r in the binomial expansion of (p+q)^n You have p=0.8 and q=0.2 You want the term containing p^4 in the expansion of (p+q)^6 That term will ...
August 12, 2015

calculus
xy^3 + 2y - 2x = 1 y^3 + 3xy^2 y' + 2y' - 2 = 0 y' = (2-y^3)/(3xy^2+2) At (1,1), y' = 2/5 Now you have a point: (1,1) and a slope: 2/5 I'm sure you know the point-slope form of a line.
August 12, 2015

calculus
tantas preguntas! tan poco trabajo!
August 12, 2015

math
If the square has side x, then the box when folded up has height 5, and a square base of side x-5-5=x-10 5(x-10)^2 = 320 (x-10)^2 = 64 x-10 = 8 x = 18
August 12, 2015

Math
If the squares have sides a and b, then we have 4a+4b=20 a^2+b^2 = 13 a+b=5 (a+b)^2 = 25 a^2+b^2+2ab = 13+2ab = 25 2ab=12 ab=6 If we assume integer sides, then since the factors of 6 are 2 and 3, a=2, b=3. check: 4*2+4*3 = 20 2^3+3^2 = 13 OK
August 12, 2015

Maths progression
we have a=2 sum of 1st 5 terms: S5 sum of next 5 terms: S10-S5 So, we now have S5 = (S10-S5)/4 4S5 = S10-S5 5S5 = S10 (5)(5/2)(4+4d) = (10/2)(4+9d) d = -6 The progression is thus 2, -4, -10, -16, -22, -28, -34, -40, -46, -52 ... S5 = -50 S10 = -250 S10-S5 = -200 T20 = 2+19(-6...
August 12, 2015

math or algebra
rate of change is °/hr You have 12° in 6 hrs Thus the average rate of change is -12°/6hr = -2°/hr the distance from sea level is just the absolute value of the elevation. That is, +500 ft and -500 ft are both just 500 ft from sea lavel. So, Climax: |11560| = ...
August 12, 2015

physics
0.544 km E = <0.544,0.000> 0.925 km S = <0.000,-0.925> 3.58 km W17.3°N = <-3.418,1.065> Adding them all up, the final location is <-2.874,0.140> Now you should be able to figure the final displacement and thus the average velocity.
August 12, 2015

math
20 cos30°
August 12, 2015

Polygon
5*180 / 7
August 12, 2015

Algebra
done - see previous posting.
August 12, 2015

Urgent math
none - see previous post.
August 12, 2015

Geometric progression
clearly, a=6, r=3/2 S13 = a(r^13-1)/(r-1) = 6((3/2)^13 - 1)/(3/2 - 1) = 4758393/2048
August 11, 2015

math
done. see prior post.
August 11, 2015

math
done - see previous post
August 11, 2015

math
done. see previous post
August 11, 2015

DC/AC Electronics
highest, since E = IR or IX
August 11, 2015

math
LCM(4,7,8,9) = 504 5:4 = 630:504 7:8 = 504:576 9:7 = 576:448 So, we have the class ratios in the sequence 630:504:576:448 Add those up and you have 2158
August 11, 2015

math
As usual, draw a diagram. If the smaller circle has center O and the larger circle has center P, and the tangent on one side touches O at A and P at B, then draw AC parallel to OP, intersecting PB at Q. Note that AQ = OP and you have a right triangle AQB where angle QAB = 30&...
August 11, 2015

math
(x)(t+54) = (1.12x)t tx + 54x = 1.12tx .12tx = 54x .12t = 54 t = 450 The actual value of x does not matter.
August 11, 2015

algebra 2
well, 1+cot^2 = csc^2 tan(cot+tan) = 1 + tan^2
August 11, 2015

mathematics
I can't see how two forces of 35 and 5 can add up to 5. 35-5 <= |u+v| <= 35+5 I suspect a typo
August 11, 2015

Urgent math
I don't see any which work 5(1)+1-9 = -3 6(4)-2 = 22 7(2)+1 = 15 3(2)+1 = 7 10(2)-2 = 18
August 11, 2015

Urgent math
(n+1)^2 = n^2+2n+1 So, check to see whether 2n^2 > n^2+2n+1 n^2 > 2n+1 Clearly, if n >= 3, n^2 >= 3n > 2n+1 (n-1)^2 > n^2 - 6 n^2 - 2n + 1 > n^2 - 6 2n - 1 < 6 2n < 7 Not true for n > 3 (c) is incomplete, but should be easy to check in similar ways.
August 11, 2015

Algebra
The 24th term is C(25,23) a^2 b^23 = 300 a^2 b^23 How did you get 252? Better review your binomial theorem
August 11, 2015

Math
as usual, draw a diagram. You will see that the distances to top and bottom of tower are top/55 = tan 60° bottom/55 = tan 45° Now just evaluate top and bottom, and you can subtract to get the height of the tower. You should get 55(√3 - 1)
August 11, 2015

Physics - My Bad
Oops. You are correct.
August 11, 2015

Physics
geez. just google it. The orbit ha a radius of 22,236 miles, and of course, the satellite completes one orbit in 24 hours, so its speed is (2π * 22236 / 24) mi/hr
August 11, 2015

physics but garbled
No idea what you mean by which is perpendicular is smaller force And is 150° the angle between the forces, or the direction of the resultant? The problem cannot possibly have been presented to you in the language you used.
August 11, 2015

Math
Oh come on. the times are x and x+10 x=20 Now, what do you think x+10 is?
August 11, 2015

Math
have you forgotten how to solve an equation? Clear the fractions by multiplying by 12x(x+10) and you have 12(x+10) + 12x = x(x+10) 12x+120+12x = x^2+10x x^2-14x-120 = 0 (x-20)(x+6) = 0 That help?
August 11, 2015

Math
The pipes take x and x+10 minutes to fill the tank. So, how much of the tank is filled in one minute? 1/x + 1/(x+10) = 1/12 x=20, so the pipes take 20 and 30 minutes.
August 11, 2015

maths
T3 and T7 are 4 terms apart, so if the common difference is d, then 4d=13-5, so d=2. Now T30 is 23 terms past T7, so add 23*2 to T7 and you get T30=59
August 11, 2015

algebra
a+2d = 5 a+6d = 13 d=2, so a+29d = a+6d+23d = 13+(23*2) = 59
August 11, 2015

physics
a = ∆v/∆t = (10.5 m/s)/(3.18s) = 3.20 m/s^2
August 11, 2015

physics
Just solve for t: 3.38 + 3.29t - 4.9t^2 = 0
August 11, 2015

Physics
I'll do (a) and (b). The other plane is similar. Since the plane is flying at an angle of 15° upward, the tank when released as a velocity of 185sin15° = 47.88 m/s vertically 185cos15° = 178.70 m/s horizontally How long does it take the tank to hit the ground? ...
August 11, 2015

physics
All you know is that the ratio of their sines is 1.4 Unless you know one of the angles, you cannot determine the other.
August 11, 2015

Urgent math pls
In the first place, you have your ratio backwards. 119-108 = 11 dB So, the intensity is 10^1.1 = 12.6 times as much.
August 11, 2015

Urgent math quick
Are you using a linear temperature function, or Newton's rule for cooling? If linear, then since the turkey cooled 35° in 1/2 hr, then it will cool another 17.5° in the next 15 minutes. 150-17.5 = 132.5° It would have helped had you shown your calculations. I ...
August 11, 2015

geometry
well, r^2 = x^2+y^2, so ...
August 10, 2015

algebra
b = 2c (b-5)+(c-5)=26 2c+c=36 c=12 So, bert is 24
August 10, 2015

calculus
y"' = 24x-6 y" = 12x^2-6x+2a y' = 4x^3-3x^2+2ax+b y = x^4-x^3+ax^2+bx+c Now what else do we know? y(-1) = 8 y(1) = 4 y'(1) = 4 So, 1+1+a-b+c = 8 1-1+a+b+c = 4 4-3+2a+b = 4 Solve for a,b,c and you have y = x^4-x^3+2x^2-x+3 I'll let you verify that it ...
August 10, 2015

advance function
I assume you want to prove that they are equal tan/sin = sec so, sec^2 = 1+tan^2 that is one of your fundamental identities, obtained by dividing by cos^2 in sin^2 + cos^2 = 1
August 10, 2015

Math
You are correct.
August 10, 2015

Math
so, yes, you are correct. Sorry -- I didn't notice your answer.
August 10, 2015

Math
remember that y=mx+b is called the slope-intercept form. Parallel lines have the same slope.
August 10, 2015

calculus
y"= 6x-4 y' = 3x^2 - 4x + a y = x^3 - 2x^2 + ax + b y(1) = 2 and y(-2) = 5, so 1-2+a+b = 2 -8-8-2a+b = 5 a = -6, b=9, so y = x^3 - 2x^2 - 6x + 9
August 10, 2015

Math
The digit in the tens place is 4. xxx4x One of the digits has a value of 700. xx74x The value of the digit in the thousands place is 10 times greater than this. x774x There is 1 less ones than tens. x7743 57743 What was so hard about that? You just have to read, and put the ...
August 10, 2015

math
3^2 + 2(3)(ab) + (ab)^2 x(x+1) - 2(x+1) - 12(2x+1) + 3x(2x+1) just expand those out and collect like terms
August 10, 2015

am I gualify for boiler maker?
Naturally, the same could be said for any other profession. :-)
August 10, 2015

Statistics Please Help
Since the bell curve is symmetric, you have p(0<Z<c) = .4868 Look up .4868 and you see that c=2.221 Or, you can see that 1-.9736 = .0264. Half of that is 0.0132 Add that to the .9736 and you have .9868 Look that up, and you have Z=2.22 You can play around with Z table ...
August 10, 2015

Algebra II
but, (5-6) = -1, so we have -1 + 14/7 = -1+2 = 1
August 10, 2015

Calculus
y' = sin 2x
August 10, 2015

Algebra
if you have y = 3x(x+4), then shrink it by multiplying by 1/5 y = 3x / 5(x+4) since 1/(5x) is shrunk compared to 1/x
August 10, 2015

English
thank you
August 9, 2015

English
"I submit that an individual who breaks a law that conscience tells him is unjust, and who willingly accepts the penalty of imprisonment in order to arouse the conscience of the community over its injustice, is in reality expressing the highest respect for law." In ...
August 9, 2015

Sociology
thank you
August 8, 2015

Sociology
What are necessary to explain research findings? a- variables b-theories c- symbols d- research models I'm not sure of the answer because you would need models to conduct the research and theories to model the research. I don't think symbols would explain the findings ...
August 8, 2015

Sociology
Are theories necessary to explain research findings? My answer is yes.
August 7, 2015

Sociology
thank you
August 7, 2015

Sociology
only 19th century sociologists addressed social problems. only 19th century sociologists tested their theories with systematic research. ancient civilizations were egalitarian and did not address class differences. war and social conflict were a product of the industrial ...
August 7, 2015

Sociology
One of the primary differences between the study of Society done by the people of ancient civilizations and the study of society conducted by sociologists 19th century was what?
August 7, 2015

math
thank you
August 7, 2015

math
if point a = -7 and b = 8 what is their length? my answer is 15
August 7, 2015

Geometry
In a line with points a,b,c,d what is the name of the ray that is opposite ba? my answer is ca
August 7, 2015

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