Thursday

December 18, 2014

December 18, 2014

Total # Posts: 28,232

**math**

present: Mario's age --- x Bert's age ----- 2x+5 Nine years ago: Mario --- x-9 Bert ---- (2x+5) - 9 = 2x -4 "Nine years ago, the sum of their ages is 50. " ----> x-9 + 2x-4 = 50 3x = 63 x = 21 Mario is now 21 and Bert is now 47 check: 9 yrs ago Mario was ...
*November 7, 2014*

**Calculus**

from xy^2 = 16 y^2 = 16/x now sub that into F = x^2 + y^2 = x^2 + 16/x dF/dx = 2x - 16/x^2 = 0 for max/min 2x - 16/x^2 = 0 2x = 16/x^2 2x^3 = 16 x^3 = 8 x = cuberoot(8) = 2 if x = 2 , y^2 = 16/2 = 8 ---> y = ±√8 or ±2√2 then F = x^2 + y^2 = 4 + 8...
*November 6, 2014*

**Intermediate Algebra**

why did you switch signs ??? x3 – 380x2 + 2x – 760 = 0 x^2(x - 380) + 2(x - 380) = 0 (x - 380)(x^2 + 2) = 0 x = 380 or x^2 = -2 , the latter has x not a real number so x = + 380
*November 6, 2014*

**Algebra/Math**

f(x) = 3x + b f^-1 (x) = (x - b)/3 (-3, a) lies on both so f(-3) = -9 + b = a f^-1(-3) = (-3-b)/3 = a (-3-b)/3 = -9+b -3-b = -27 + 3b 24 = 4b b = 6 then a = -9+6 = -3 a = -3, b = 6 check my arithmetic
*November 6, 2014*

**Calculus-Newton Method Approximation**

1/ 3(x^3) + 1/2(x^2) + 1 = 0 times 6 2x^3 + 3x^2 + 6 = 0 let y = 2x^3 + 3x^2 + 6 dy/dx = 6x^2 + 6x according to Newton's method newx = x - y/y' = x - (2x^3 + 3x^2 + 6 )/(6x^2 + 6x) = (6x^3 + 6x^2 - 2x^3 - 3x^2 - 6)/(6x^2 + 6x) = (4x^3 + 3x^2 - 6)/(6x^2 + 6x) using my ...
*November 6, 2014*

**Math/Algebra**

let's find their intersection points 1+x^2+x^3 = 3-x^2+x^3 2x^2 = 2 x^2 = 1 x = ± 1 if x = 1, y =1+2+1 = 3 if x = -1, y = 1 + 1 - 1 = 1 They intersect at (1,3) and (1,1) so what is the difference between their y values ?
*November 6, 2014*

**Algebra**

√((x-2)^2 + (y-7)^2 = 13 square both sides and expand x^2 - 4x + 4 + y^2 - 14y + 49 = 169 x^2 - 4x + y^2 - 14y = 116 but x = 10+2y sub that into the first equation (10+2y)^2 - 4(10+2y) + y^2 - 14y = 116 100 + 40y + 4y^2 - 40 -8y + y^2 - 14y = 116 5y^2 + 18y - 56 =0 (y-2...
*November 6, 2014*

**Math**

So we are going to need those intercepts, the x - intercepts are easy x = 3 or x = -2 for the y-intercept, let x = 0 y = (-3)^2 (2) = 18 so the points of the triangle are (3,0), (-2,0) and (0,18) so the base of the triangle is 5 and the height is 18 area = (1/2)(base)(height...
*November 6, 2014*

**statistic**

a) prob(red) = .546 prob(not red) = .454 prob(exactly 5red) = C(12,5) (.546)^5 (.454)^7 = appr .153 b) prob (green) = .395 prob(not green) = .605 prob(at least 3 green) = prob(3green) + prob(4 green) + ... + prob(12 green) =1 - prob(0 not green) - prob(1 not green) - prob(2 ...
*November 6, 2014*

**math**

c is wrong 3^3 = 27 , so 27 is a perfect cube.
*November 6, 2014*

**geometry**

what is 8/9 yards ?
*November 6, 2014*

**Math**

I suspect you meant: c(t) = 9 - 90 000 (1/ (10 000 + 3t) ) I will also assume that c(t) is in kg/m^3 then 6 = 9 - 90 000 (1/ (10 000 + 3t)) 90000(1/(10000+3t)) = 3 30000 + 9t = 90000 9t = 60000 t = 6666 2/3 minutes ? check my arithmetic
*November 6, 2014*

**Trigonometry**

Did you make your sketch? Mine is triangle ABC with angle A = 55° angle C = 22°, and angle B + 103° then it is just a matter of the sine law: AC/sin103 = 300/sin22 I got AC = appr 780 miles
*November 6, 2014*

**geometry**

There would be an infinite number of such triangles. What part of the instructions are you having difficulties with ?
*November 6, 2014*

**Maths**

make your sketch draw a horizontal line from the top of the shorter pole to the other pole. You now have a right-angled triangle with base 12 m, height 18-13 or 5 m You should recognize the common 5,12, 13 right-angled triangle, if not c^2 = 12^2 + 5^2 = 169 c =√169 = 13
*November 5, 2014*

**Algebra**

adults --- x children -- y seniors --- z x+y+z = 895 , #1 14x +11y + 8z = 10514 , #2 translation of: "If the combined number of children and adult tickets exceeded twice the number of senior citizen tickets by 295" ---> x+y > 2z by 295 x+y = 2z + 295 x + y - 2z...
*November 5, 2014*

**Trig**

"A playground slide starts 107cm above the ground and is 250cm long" Trusting my English grammar somewhat, you made "slide" the subject of your sentence, and you said it is 250 cm long. Thus 250 is the hypotenuse. tanØ = opposite/adjacent sinØ...
*November 5, 2014*

**Trig**

Assuming the slide is a straight line, (most are not) Did you make your sketch? I have the opposite as 107 and the hypotenuse as 250 so sinØ = 107/250 Ø = appr 25°
*November 5, 2014*

**please help, math question**

let the width of the matte be x all around so the width of the whole picture = 10+2x and the length is 15+2x area of whole picture = (10+2x)(15+2x) area of picture = 10(15) = 150 area of matte only = (10+2x)(15+2x) - 150 so (10+2x)(15+2x) - 150 = 150 150 + 20x + 30x + 4x^2 - ...
*November 5, 2014*

**Algebra 2**

let x be the larger then the smaller is 96-x x - (96-x) = 17 x - 96 + x = 17 2x = 113 x = 56.5 larger is 56.5 , the smaller is 39.5 check: difference = 56.5-39.5 = 17 , yup!!
*November 5, 2014*

**Vertex, Focus, & Directrix of Parabolas**

Just did this for Kayla http://www.jiskha.com/display.cgi?id=1415240099
*November 5, 2014*

**Math**

x( 1 - 1.02^-11)/.02 = 1700 x( 9.786848.. = 1700 x = $ 173.70
*November 5, 2014*

**Algebra II**

writing it in terms of y first of all 48y = x^2 - 12x + 276 or 48y = x^2 -12x + 36 - 36 + 276 48y = (x - 6)^2 + 240 y = (1/48) (x-6)^2 + 5 so the vertex is (6,5) the x of the focus is the same as that for the vertex so x = 6 for y = (1/48)x^2 - (1/4)x + 23/4 the y of the focus...
*November 5, 2014*

**Math HELP!**

What did we do to the 7 to make it a 2 ? looks like we subtracted 5 What did we do to the -3 to turn it into a 5 ??? so (x,y) ---> (x-5, ..........) I am sure you can get this
*November 5, 2014*

**math**

I did this same problem 2 years ago http://www.jiskha.com/display.cgi?id=1352760453 Looks like this teacher is just recycling the same problems
*November 5, 2014*

**Math**

for any parabola of the form y = a(x-h)^2 + k , the vertex is (h,k) and the axis of symmetry is x = h so in your case ......
*November 5, 2014*

**math**

it should not be too hard to actually list them Q-D-N 0 0 6 0 1 4 0 2 2 0 3 0 1 0 5
*November 5, 2014*

**Finance**

what is 1000(1.07)^20 ?
*November 5, 2014*

**trigo**

distance covered by both wheels must be the same ... with radians, arclength is simply rØ so 24Ø = 60(12) Ø = 30 radians
*November 5, 2014*

**Algebra**

Don't know what you want to "solve" You have a cubic function, are you graphing it? are you finding intercepts? ??
*November 5, 2014*

**Probability**

prob(right) = 1/4 prob(wrong) = 3/4 if passing grade is 8/10, then I will pass if I get 8/10 or 9/10 or 10/10 prob of that = C(10,8)(1/4)^8 (3/4)^2 + C(10,9)(1/4)^9 (3/4) + (1/4)^10 = appr .00041 check my arithmetic
*November 5, 2014*

**college statistics**

C(12,3) = 12!/(3!9!) = 220 Added attraction: Google Pascal's triangle look at the row: 1 12 66 220 495 .... here is a good one.. http://ptri1.tripod.com/
*November 5, 2014*

**algebra**

Your answers make no sense to me. How did you get these?
*November 4, 2014*

**algera**

find the derivative, set it equal to zero and solve.
*November 4, 2014*

**algebra**

You left your answer choices blank. What did you get?
*November 4, 2014*

**Calculus**

BUT, the given point is not on the curve, so what you did is bogus. look at your sketch, the point (0,-4) is below the parabola. Draw the two tangents, you will see that it touches the curve at two different points, one in the first quad, the other in the 2nd quad. Let the ...
*November 4, 2014*

**Calculus**

y' = 18x^2 + 5 we want 18x^2 + 5 = 4 18x^2 = -1 x^2 = -1/18 but that is not possible since the square of anything has to be positive, so there is value of x making this equations true thus there is not slope of 4 thuse there is no such tangent
*November 4, 2014*

**Calculus**

dy/dx = 6x^2 - 6x - 6 = 0 for a horizontal slope x^2 - x - 1 = 0 x = (1 ± √5)/2 = appr 1.618 or -.618 you are correct, but all it asked for is the values of x (did you know that the first answer x = 1.618.. is the "golden ratio " ? )
*November 4, 2014*

**Calculus**

correct
*November 4, 2014*

**math**

look at one of the 6 congruent triangles the base of it must be 78/6 = 13 area of one of them = (1/2)base x height = (1/2)(13)(11) = 143/2 square inches so the whole hexagon is 6(143/2) = 429 inches^2
*November 4, 2014*

**math**

adults --- x children --- 3x 7x + 3(3x) = 6000 16x = 6000 x = 375 so 375 adults and 1125 kids for a total of 1500 sold
*November 4, 2014*

**Math**

cost per quart for orange --- x cost per quart for grapejuice -- x-1 (5/2)(x-1) + (3/2)x = 12.5 times 2 5(x-1) + 3x = 25 8x = 30 x = 3.75 x-1 = 2.75 orange juice costs $3.75 per quart and grape juice costs $2.75 per quart
*November 4, 2014*

**math**

I am 100% sure it was measured in feet. Looks like Sandy is a kid or a short junior. The stick should come to your chin with skates on, and to about your nose without skates on.
*November 4, 2014*

**algebra**

number of dimes --- x number of nickels --- 2x 10x + 5(2x) = 120 20x = 120 x = 6 So 6 dimes and 12 nickels
*November 4, 2014*

**Algebra**

I have a feeling you meant f(x) = (x+5)/3 or is it the way you typed it ? confirm please
*November 4, 2014*

**math**

looks like plain ol' Pythagoras to me y^2 + 2.8^2 = 10.5^2 y^2 = 102.41 y = √102.41 = appr 10.12 m
*November 4, 2014*

**Algebra please help**

since a 2 ounce bag is 1/3 of a 6 ounce bag, I predict it will cost one third of $3.60.
*November 4, 2014*

**Algebra please help answer**

clearly 9:6 ≠ 4:3
*November 4, 2014*

**algebra**

I am assuming that the 2nd shift follows the first shift now: let the number of girls in A be x let the number of girls in B be y after 1st shift: A has x-7 B has y+7 "the number of girls in the classes would interchange" ---> y+7 = x 2nd shift A has x-7 + 4 = x-3...
*November 4, 2014*

**Algebra**

Are you sure you don't have any more information, such as an angle ? otherwise, let the third side be y P = 2(3x+2) + y
*November 3, 2014*

**Math: permutation**

let's choose the consonants and vowels first No of combinations = C(5,2) x C(2,1) = 10(2) = 20 Since you titled your post "permutations" we now want to arrange these. That can be done in 6 ways each So the number of permutations is 6(20) = 120
*November 3, 2014*

**Math**

looks like you are studying the binomial theorem You MUST memorize some basic formulas e.g. for (a+b)^n term(r+1) = C(n,r) (a^r)(b^(n-r)) so for (3x+9)^9 term6 = C(9,5)(3x)^5 y^4 = 126(243x^5)y^4 = 30618 x^5 y^4 b) what is the middle term for (3x + y^3)^8 ? c) let that term be...
*November 2, 2014*

**Math**

2.25 = 1(10^8) 1.5^(t/20) since the time would be same for a small country or a large country to increase by 124%, we can ignore the 10^8 take log of both sides log 2.25 = l log 1.5^(t/20 log 2.25 = (t/20) log 1.5 log2.25/log 1.5 = t/20 t = 20(log2.25)/log 1.5 = 40 years 2 = 1...
*November 2, 2014*

**Algebra**

Wow, that is the second post in a row that your re-posted before checking if your first posting had been anwered. http://www.jiskha.com/display.cgi?id=1414981217
*November 2, 2014*

**Algebra**

Bob did this for you Did you not check back ???
*November 2, 2014*

**Math**

from max to min = 254-88 = 166 so amplitude = 84 period = 20 min period = 2π/k 20 = 2π/k k = π/10 let p(t) = 83 cos π/10(t + d) + 171 when t = 0 we want p(0) = 88 88 = 83cos (π/10)cos(0 + d) + 171 -1 = cos (dπ/10) I know cos π = -1 so dπ...
*November 2, 2014*

**Pre-Calc**

draw a line from his final position to the centre and complete the triangle all the way around is 2πr = 6π so completed 6/6π or 1/π around the circle angle" Ø/360 = 6/6π Ø = 360/π = 114.59156° cosØ = x/3 and sin&...
*November 2, 2014*

**Math Calc**

I will assume that neither A nor B are the right angle, or else why would you ask to find it So tanB = 13/26 = 1/2 angle B = 26.565 then angle A = 63.435° (90 - B) c^2 = a^2 + b^2 = ... you finish it
*November 2, 2014*

**Algebra**

You probably meant: f(x) = (2x-1)/(x+5) I will assume that then y = (2x-1)/(x+5) we form the inverse by interchanging x and y x = (2y-1)/(y+5) xy + 5x = 2y -1 now solve this for y xy - 2y = -5x - 1 y(x-2) = -5x - 1 y = f^-1 (x) = (-5x - 1)/(x - 2) so by comparison, a = -5 b...
*November 2, 2014*

**Math**

We "solve" equations, yours is not an equation. Did you perhaps want to factor it ?? x^2 - (y^2 + 2y + 1) = x^2 - (y+1)^2 ahhh, a difference of squares ... = (x+y+1)(y-y-1)
*November 2, 2014*

**Algebra**

((7-10)+3)-5 ---> (10-7) + 3) - 5) = (-3+3) - 5 ----> (3-(-3)) - 5 = 6-5 ----------> 5-6 = -1
*November 2, 2014*

**Algebra (1)**

Is that (y+2)/(y+7) = 11/31 ?? , (looks like ll instead of 11) Are you solving for y ?? if so, just cross-multiply 31y + 62 = 11y + 77 20y = 15 y = 15/20 = 3/4
*November 2, 2014*

**Calculus**

when x = 3 f(3) = 1.201 , correct to 3 decimals so the point of contact is (3, 1.201) f ' (x) = e^(-.4x) (1/x) + (-.4) e^(-.4x) ln(18x) f ' (3) = -.380 correct to 3 decimals y - 1.201 = -.38(x-3) y = -.38x + 2.342 better check my arithmetic and button-pushing
*November 2, 2014*

**statistics and probability**

fewer than 4 defective ---> 0 ,1,2, or 3 are defective prob(defective) = 5/100 = 1/20 prob(not defective) = 19/20 prob = C(100,0) (1/20)^0 (19/20)^100 + C(100,1)(1/20)(19/20^99 + C(100,2)(1/20)^2 (19/20)^98 + C(100,3)(1/20)^3 (19/20)^97 = .00592.. + .03116.. + .08118...+ ....
*November 2, 2014*

**math**

4(x+15) ≥ 120 4x + 60 ≥ 120 4x ≥ 60 x ≥ 15
*November 2, 2014*

**Algebra**

let n be the number of pages scanned .02n + 70 ≤ .09n 70≤ .02n or .02n ≥ 70 n ≥ 3500 so 3500 pages is the break-even point so anything greater than 3500 she should rent the scanner, at less than 3500 her old scanner will be better.
*November 2, 2014*

**calculus**

arrrgggghhh! Wolfram says: http://integrals.wolfram.com/index.jsp?expr=x%5E2%2F%28%28x%2B3%29%283x%2B4%29%5E%281%2F2%29%29&random=false
*November 2, 2014*

**mathzzzz gkpp**

x(1.1)^2 = 12000 x = 12000/1.1^2 = appr 9917.36
*November 2, 2014*

**math**

Please use proper English with correct grammar and punctuation in your post. It would make it so much easier to establish what your are trying to say. Furthermore, is there a question such as, "Find x" ? sum of 8 number is x so the average of those 8 numbers is x/8 ...
*November 2, 2014*

**Intermediate Algebra**

I assumed that you meant (-9)^(1/2) which is the same as √-9 , which of course is not real vs -(9^(1/2)) which is -√9 which is -3 the ^ is the generally accepted symbol to indicate an exponent, e.g. x^2 is x squared, x^5 is x to the fifth, etc
*November 2, 2014*

**Intermediate Algebra**

This only makes sense if you meant √(-9) vs - (√9) remember we cannot take the square root of a negative number, that would be an imaginary or complex answer. but by the order of operation for -√9 we take the square root first, and then make the answer ...
*November 2, 2014*

**Solid Mensuration**

Remember that in a cyclic quadrilateral, the diagonal subtends a 90° angle. Since the two diagonals also intersect at 90°, the shorter diagonal must be bisected by the diameter. In my diagram, I labeled the diameter A and B and the point on the circle above AB as C My ...
*November 2, 2014*

**Calculs I**

btw, jorge's answer is bogus. I got 27203
*November 2, 2014*

**Calculs I**

y(t) = a e^(kt) , where a is the intitial count, and k is a constant, and t is in minutes You have two ordered pairs, (15,16000) and (45,22000) for (15,16000) 16000 = a e(15k) for (45,22000) 22000 = a e^(45k) divide the 2nd by the 1st 1.375 =e^(30k) ln both sides , that is : (...
*November 2, 2014*

**Calculus**

k(t)=(t^2-4)^2 = (t^2 - 4)(t^2 - 4) now do as instructed
*November 2, 2014*

**Calculus**

let the time after their split be t hrs I see a triangle with sides 10t and 6t and an angle of 120° between them let the distance between them be d miles by the cosine law: d^2 = (6t)^2 + (10t)^2 - 2(6t)(10t)cos120° = 136t^2 + 60t^2 d2 = 196t^2 d = 14t dd/dt = 14 mph...
*November 2, 2014*

**Calculus**

2x dx/dt + x dy/dt + y dx/dt + 2y dy/dt = 0 (dy/dt)(x + 2y) = -2x dx/dt - y dx/dt dy/dt(2 + 6) = -4(3) - 3(3) dy/dt = -21/8 the ant is moving DOWN at 21/8 cm/s
*November 2, 2014*

**Calculus**

C = 2πr dC/dt = 2π dr/dt A = πr^2 dr/dt dA = 2πr dr/dt you have the values to plug in for both rates.
*November 2, 2014*

**Calculus**

dV/dt = πr^2 dh/dt + 2πrh dr/dt plug in the given values SA = 2πrh , are you not considering the ends ? differentiate with respect to t using the product rule like I did for the volume, then plug in the values
*November 2, 2014*

**Calculus**

let the length be x inches let the width by y inches A = xy dA/dt = x dy/dt + y dx/dt for the given data... dA/dt = 24(-3) + 15(4) = -12 inches^2/min the area is decreasing at 12 square inches/min P = 2x + 2y dP/dt = 2 dx/dt + 2 dy/dt = 2(-3) + 2(4) = 2 inches/min
*November 2, 2014*

**Math**

i = .049/12 = .00408333... n= 15(12) = 180 amount = 10000(1.00408333..)^180 = $ 20,823.63
*November 2, 2014*

**Algebra**

notice that for every increase of 1 in the x, the y increases by 2 so slope = 2 or, more formally, take the fist two points (1,1) and (2,3) slope = (3-1)/(2-1) = 2 so y = 2x + b sub in the first point (1,1) 1 = 2(1) + b b = -1 y = 2x - 1 check the remaining points to make they...
*November 1, 2014*

**Algebra**

I assume you want it 'simplified' and that you forgot the brackets (8-6i)/(3i) = (8-6i)/(3i) * i/i = (8i - 6i^2)/(3i^2) = (6 + 8i)/-3 or =( -6 - 8i)/3 hint for the second... multiply top and bottom by (4-2i)/(4-2i)
*November 1, 2014*

**Math**

simply solve ... .07x + .15(x+1500) = 1545 where x is the amount invested at 7%
*November 1, 2014*

**Maths**

Please type your question in proper English. "d" is the common variable for the difference between consecutive terms of an AP and not as a substitute for "the".
*November 1, 2014*

**math**

Finding the distance between 2 points and finding the midpoint between 2 points should be part of your repertoire of common and memory-recall-ready formulas if you want to study math for (a,b) and (c,d) Distance = √( (c-a)^2 + (d-b)^2 ) midpoint = ( (a+c)/2 , (b+d)/2 ) ...
*November 1, 2014*

**Algebra**

so a#b =(a+b)/2 then ((1#2)#2)#4 = (1.5#2)#4 = 1.75#4 = 2.875 or = 23/8 or ((1#2)#2)#4 = (3/2#2)#4 = (7/4)#4 = 23/8
*November 1, 2014*

**Algebra**

P(g(x)) = p(4-3x) = 4 + 2√(4 - 3x + 2) = 4 + 2√(6-3x) remember we cannot take the square root of a negative, so 6-3x≥0 -3x ≥ -6 x ≤ 2 so the largest value of a is 2
*November 1, 2014*

**MATHS**

I will need 2 zeros (0 can't be in front) 3 ones 3 twos 3 fours ... 3 sevens 2 eights 2 nines total = 29 for b) we can save the 2 nines, (the 3 sixes will suffice) so they can save 2 cards
*November 1, 2014*

**Maths**

Prob(m) = 1/5 prob(S) = 4/5 Possible outcomes in best of three" MM --- (1/5)(1/5) = 1/25 MSM -- ((1/5)(4/5)(1/5) = 4/125 SMM -- ((4/5)(1/5)(1/5) = 4/125 SS ---- (4/5)(4/5) = 16/25 ----> Sue wins SMS -- (4/5)(1/5)(4/5) = 16/125 ----> Sue wins MSS -- ((1/5)(4/5)(4/5...
*November 1, 2014*

**Algebra**

πr^2 = 2πr r^2 - 2r = 0 r(r-2) = 0 r = 0 , the trivial answer or r = 2 So the diameter is 4 a/b = 2/3 or 2b = 3a, or b = 3a/2 (a+5)/b = 5/6 5b = 6a + 30 5(3a/2) = 6a + 30 times 2 15a = 12a + 60 a = 20 and b = 3(20)/2 = 30 the fraction was 20/30 y < √x by 4 y...
*October 31, 2014*

**Math**

factor is 10^8.8/10^7.1 = 10^1.7 = appr 50 times as strong
*October 31, 2014*

**Math**

number of quarters ---- x " he has one more dime than he has quarters" ---> dimes ---- x+1 now for the "value" of coins equation: 25x + 10(x+1) = 115 25x + 10x + 10 = 115 35x = 105 x = 3 etc
*October 31, 2014*

**Width of a square**

How can 45/10 = 3.5 ?? 45/10 = 4.5
*October 31, 2014*

**math**

You are looking for those values of x, so that y = (x+5)/(x-2) lies above the x-axis first of all, x ≠ 2 or else we are dividing by zero critical values are -5 and 2 investigate x < -5, say x = -10 then y = -/- = + , that's good investigate between -5 and 2, say x...
*October 31, 2014*

**maths**

I will assume you meant: 1/( (x+2)(x+3) ) - 1/( (x-4)(x-5) ) what about it? are you simplifying?
*October 31, 2014*

**Math, Can someone check my answers?**

all 3 are correct
*October 31, 2014*

**Thanks Steve - Pre Calculous**

for keeping an eye on me. I just have to read more carefully, I read it as sinx = 1/4
*October 31, 2014*

**Pre Calculous**

my keystrokes on my calculator: 2nd sin .25 = to get 14.478° but the sine is positive in I and II so x could also be 180 - 14.478 = 165.522° there are an infinite number of solutions, just add/subtract 360° to any existing answer to produce more.
*October 31, 2014*

**Math Calc**

divide by 7 sinØ = 6/7 Ø = arcsin (6/7) = appr 58.997° Did you use a calculator? my keystrokes: 6 ÷ 7 = 2nd sin = to get my answer
*October 31, 2014*

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