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March 25, 2017

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Posts by Reiny

Total # Posts: 38,076

Work Ethics
Look at this post from last year. It contains all of your individual question all in one post http://www.jiskha.com/display.cgi?id=1472922204
March 11, 2017

Math,quadratic equation
I suppose you are solving ? x^2 - 5x - 5 = 0 It does not factor, so your other option are to complete the square or to use the quadratic equation. Your choice.
March 11, 2017

math
Use a Venn diagram with 3 overlapping circles named after the reason for failing, use C, H, T as suggested as their labels Place 8 in the intersection of all three. Now work on the intersection of two at a time. e.g. 14 would go in the intersection of C and T, but we already ...
March 11, 2017

Math
so the field is 300 by 200 m and the road would be 10 m by 300m Surely you can find the area of the road.
March 11, 2017

Math
width --- x length --- x+16 2x + 2(x+16) = 200 solve
March 11, 2017

mathematics steve
So you got your orange, leaving 14 fruits remaining. prob(mango) = 5/14
March 11, 2017

math
Ok, let's go with that So the number of boys is x , and so is the number of girls Total at the party = 2x boys with part-time jobs = x/4 girls with part time jobs = 2(x/4) = x/2 total part-timers = x/4 + x/2 = 3x/4 no part-time jobbers = 2x - 3x/4 = 5x/4 5x/4 = 30 x = 24 ...
March 11, 2017

Math
learly you are studying the quadratic function , which when graphed is a parabola. One of the first things you learn is how to find the vertex. Go to your text or you class notes to look at the example and do the same thing.
March 10, 2017

algebra
child's ticket --- x adult ticket ---- 3x 5x + 2(3x) = 98 take over
March 10, 2017

MATH
That would be an answer, since all we need is two numbers or expressions which when multiplied give us 6x^2-3x-3m^2. I have a suspicion that the middle term should be -3xm, then we could go further: 3(2x^2-x-m^2) = 3(2x + m)(x - m) but since we want only two factors, namely ...
March 10, 2017

Math
As you should know, Interest = Principal x Rate x Time in #1 and #2 question plug in the given values, and solve for the missing variable compound interest: Amount = Principal (1 + i)^n , where i is the interest per period, and n is the number of interest periods. Again, plug ...
March 10, 2017

algebra
Actually I made an error. I meant to say pick x = 4, which would result in 0 on the right side, so the point is (4,-5)
March 10, 2017

algebra
This is a straight line, so all you need is two points. Join them and you got your line. pick x's that result in nice values of y e.g. let x = 0, y+5 = 0 y -5 ----> point (0,-5) let x = 7 y+5 = -2/3(3) = -2 point (7,-2) go for it
March 10, 2017

Math
volume = ?(1.2)^2 (4) ft^3 rate = 1.7 thirds of a foot ???? once you have that one figured out, divide volume by rate
March 10, 2017

Math
Ab's rate --- 1/5 Bail's rate ---- 1/3 combined rate = 1/5 + 1/3 = 8/15 combined time = 1/(8/15) = 15/8 hrs = 1 7/8 hrs
March 10, 2017

math
simplify (8*10^7)(7*10^4) i think it's 5.6*10^10 < --- incorrect simplify (3*10^6)(8*10^-4) i think it's 2.4*10^3 < --- correct Astronomers measure large distances in light-years. One light-year 5.88*10^12 mi Star is 9.8*10^1 light years from Earth in ...
March 10, 2017

math
3 = 1 e^(10k) 10k = ln 3 k = ln3/10 so amount = 1000 e^( (ln3/10)t) 9000 =1000 e^( (ln3/10)t) 9 = e^( (ln3/10)t) ln 9 = (ln3/10)t ln9/(ln3/10)= t t = 10ln9/ln3 = 20 years
March 10, 2017

Algebra
ratio of 1800 : 2400 = 3 : 4 return ration = 3x : 4x 3x+4x = 1400 7x = 1400 x = 200 so they receive 600 and 800 respectively
March 10, 2017

math
look at numbers ending in 7, such as 7^1 = 7 7^2 = 49 7^3 = 343 7^4 = 2401 7^5 = 16807 7^6 = 117649 7^7 = 823543 notice that the unit digits forms a cyclic pattern: 7, 9, 3, 1, 7, 9 3, 1, .... the same would be true for something like 37^n try it. Also: 2017^1 = 2017 --- 4 ...
March 10, 2017

Algebra
let the original fraction be 3x/(2x) (3x+3)/(2x-2) = 9/4 , where x ? 1 18x-18 = 12x + 12 6x = 30 x = 5 the original fraction is 15/10 A poorly thought-out question. Fractions should be reduced to their lowest terms. We would of course reduce our fraction 15/10 to 3/2. In that ...
March 10, 2017

Pre calc
let the rate of decay be r, where r is a decimal so letting 2003 correspond with t = 0 , then 2005 corresponds with t = 2 900,000 r^2 = 800,000 r^2 = 8/9 r = ?(8/9) = appr .9428 So count = 9000(.0428)^t in 2008 , t = 5 count = 900,000(.9428)^5 = appr 670,442 or 670,000 rounded...
March 9, 2017

Fractions
(4y^-3/5x^-4)^2 = (16y^-6)/(25x^-8) = (16/25)(x^8)/(y^6) or = 16x^8/(25y^6)
March 9, 2017

Mat222
let f(y) = (y^2 + 11y + 30)/(y+5) <---- those brackets are needed or else we would have a term of 30/y sitting there all by itself = (y+5)(y+6)/(y+5) = y+6 That is, f(y) behaves just like a linear function of f(y) = y+6, EXCEPT when y = -5 in the original function we get f...
March 9, 2017

math
You are using Pythagoras x^2 + y^2 = h^2 8^2 + y^2 = 11^2 y^2 = 121 - 64 = ... y = ?... = ??
March 9, 2017

Math
Bearings are usually measured in degrees or radians. Kilometres are not a unit of "bearing", I will assume you meant degrees. I labeled my starting place C, the end of the first leg A, and the end of the second leg B. Let me know when you are done with your diagram, ...
March 9, 2017

Math help! Hurry Please~
Can't help since you did not supply your choices. How can I check your answers ?
March 9, 2017

math
Since the places are specific, number of ways = 6(5)(4) = 120
March 9, 2017

geometry
You will have to have more information, such as, what is the size of the angle, or, how far from the wall is the foot of the ladder.
March 9, 2017

MATH
How can I possible check your work if you don't supply the answers. use <----- to point to your choice at each question. That way I don't have to scroll back and forth in your post.
March 9, 2017

Math
Make a sketch. It is easy to see that the height of the triangle that is folded over is 1/4 of the diagonal of the square, so .... let the side of the square be x then its diagonal is ?2x and the height of the triangle bent over is ?2x/4 and the fold at which the bending takes...
March 8, 2017

Algebra2
If you meant (0,2) then you are correct
March 8, 2017

Math\
I will assume you mean : Find the smallest number which is greater than 4444 n divisible by 8 What's with the n after the 4444 ? No idea why you tagged the word "formulas" at the end. well, 4444/8 = 555.5 so 555(8) = 4440 too small no the next numbers which are ...
March 8, 2017

Math
The order of operation would force me to do the divisions in the order they come, so (3m/2)÷ 3 = 7 = (3m/2)(1/3) = 7 3m/6 = 7 3m = 42 m = 14 confirmation by Wolfram http://www.wolframalpha.com/input/?i=solve+3m%2F2%2F3%3D7
March 8, 2017

Math - Calculus
width of rectangle ---- x length of rectangle --- 3x radius of circle ----- r so 2x + 6x + 2?r = 16 4x + ?r = 8 ----> x = 2 - ?r/4 let S be the sum of the areas of the rectangle , (you had "square" , I assume that was an error) S = ?r^2 + 3x^2 = ?r^2 + 3(1 - ?r/4...
March 8, 2017

6th grade math
The symbol for multiplication used in this format is either the * sign or to use brackets, not a comma V = l*w*h or (l)(w)(h) or simply V = lwh so V = (4)(2)(8.5) = ..... inches^3
March 8, 2017

Math
I was hoping that you would correct the grammar and spelling from you last post to make your question clearer. That first part is not even needed, since you said in your second sentence that the camera takes two pictures in each rotation cycle. So to take 100 pictures would ...
March 8, 2017

math
The LCD is 6, so multiply each term by 6 to get 4x - 4 = x + 8 easy from here
March 8, 2017

math
5x - 15 + 6 = 4x + 3 Do the x's disappear ? You were told what to expect in your previous question relating to this. http://www.jiskha.com/display.cgi?id=1489016844
March 8, 2017

Math
C(X)= 10,000 + 20xeX/600 makes no sense to me, did you mean C(X)= 10,000 + 20xe^(x/600) ?? if so, just plug in x = 600 to get C(600) = 10000 + 600(e^1) = .... e^1 = 2.718281828...
March 8, 2017

Algebra2
If you make a sketch, you will see that the directrix must be y = 4 let P(x,y) be any point ?( (y-6)^2 + (x+2)^2 ) = ?((y-4)^2 + 0) square and expand y^2 - 12y + 36 + (x+2)^2 = y^2 - 8y + 16 (x+2)^2 = 4y - 20 (x+2)^2 = 4(y- 5) I agree
March 8, 2017

Algebra2
-3x^2+12y^=84 3x^2 - 12y^2 = -84 x^2 /28 - y^2 /7 = -1 You have a vertical hyperbola, with vertices (0,?7) and (0,-?7) your answer is correct
March 8, 2017

Algebra2
You are correct, you are looking at an ellipse with centre (0,0)
March 8, 2017

maths
Looks like I messed up for my x I multiplied 4x by 4 instead of dividing by 4 4x = 3.4 x = .85 see Steve's solution
March 8, 2017

maths
cost of pencil --- p cost of eraser --- e cost of pen ----- x 2e + 4p = 2.4 (1) 6e + p + 2x = 3.95 (2) e + p + 4x = 4.15 (3) I would not use a matrix method, the equations are much too "nice". from (1) : e = 1.2 - 2p sub into (2) 6(1.2 - 2p) + p + 2x = 3.95 -11p + 2x...
March 8, 2017

Math
4 cm ----> 9 ft 1 cm ----> 9/4 ft then 11 cm ----> ??? ft ( if 1 apple costs 30 cents, how much would 3 apples cost? What operation did you do ?)
March 8, 2017

MATH
yes, the formula they appear to follow is this: given: the slope m, and a point (a,b) equation of line: y-b = m(x-a) so the slope of the given line is 8/3 perpendicular lines have slopes that are negative reciprocals of each other. So the slope of the new perpendicular line ...
March 8, 2017

math
so you want the terms that contain x^0 In (2+x^2)^6 (1-3/x^2)^2 we have the following: = (2^6 + 6(2^5)x^2 + 15(2^4)x^4 + ...)(1 + 2(-3/x^2) + 9/x^4) so we only have to worry about: 2^6 (1) , 6(2^5)x^2 * (-6/x^2) and 15(2^4)x^4 * 9/x^4 their sum is 64 + (-1152) + 2160 = 1072
March 8, 2017

Math
The men positions can be filled in (5)(4) or 20 ways. The women position can be filled in (12)(11)(10)(9) or 11880 ways Which is exactly what Steve had in P(5,2) * P(12,4) = 20(11880) = 237600 ways So go with Steve's answer.
March 8, 2017

Math
let's get the equation of that straight line: y+1 = (-5/3)(x-6) 3y + 3 = -5x + 30 3y = -5x + 27 y = (-5/3)x + 9 f(x) = (-5/3)x + 9
March 7, 2017

FUR. MATHS
Is there a question?
March 7, 2017

maths trigonometry
No improvement over your last post of this ... http://www.jiskha.com/display.cgi?id=1488915415 No question was actually asked.
March 7, 2017

Finance
.07x = 100 x = 100/.07 = 1428.57 check: If you had $1428.57 then annual interest at 7% is $100. So you use that to pay your charity or scholarship or whatever, and the balance would remain at 1428.57, allowing you to do this forever. Interest = 1428.57(.07)(1) = 99.9999 or 100...
March 7, 2017

math
Just saw the domain part ... 0 < x ? 2 F^-1(0) = undefined, but F^-1(x) ----> negative infinity F^-1(2) = (1-10)/4 = -9/4 so the domain of F(x) is - infinity < x < -9/4
March 7, 2017

math
First of all, I will assume you meant: F^-1(x) = (1-5x)/(2x), or else I would have just reduced to F^-1(x) = 1 - 5/2 = -3/2 , a constant The inverse of the inverse of a function would be the function, that is, the inverse of F^-1(x) would be F(x) so we just need the inverse of...
March 7, 2017

Math
now: temp = 65 after 1 hour temp = 65 + 5(1) after 2 hours temp = 65 + 5(2) after 3 hours temp = 65 + 5(3) ... after x hours temp = 65 + 5x
March 7, 2017

Math
my reply is the same as it was in your last post The question cannot be answered. More information is needed, such as a diagram, which of course we cannot post here.
March 7, 2017

Math
The question cannot be answered. More information is needed, such as a diagram, which of course we cannot post here.
March 7, 2017

Math
Every even number is divisible by 2, but not necessarily divisible by 4 e.g. 6,10, and of course the 18 in your list would fall into that category. So the correct answer is 18 but is even, so Lisa's generalization is incorrect. 18 is NOT divisible by 4
March 7, 2017

Math
sister --- x you ----- x+6 5 years from now: sister ---- x+5 you ------x+11 x+5 = (5/6)(x+11) 6x + 30 = 5x + 55 carry on
March 7, 2017

Math
let the volume of the larger glass be x ounces so volume in the pitcher = x + 4 so .6(x+4) = 4 + .5x .6x + 2.4 = 4 + .5x .1x = 1.6 x = 16 ounces
March 7, 2017

Maths
correct
March 7, 2017

math
amount at 5% ---- x amount at 4% ---- x - 2400 .05x + .04(x-2400) = 165 solve for x
March 7, 2017

Math
Did you make a sketch? let the height of the flag pole be f let the height of the tower be t tan 57 = f/70 f = 70tan57 tan 69 = (f+t)/70 f+t = 70tan69 t = 70tan69 - f = 70tan69 - 70tan57 = ... you do the buttonpushing
March 7, 2017

Math
We only want 4 pies, the fact that they are 9 inches is irrelevant. each pie needs 1/2 cup of juice, so we need 2 cups = 32 tablespoons each lemon produces 2 tablespoons, so we need 16 lemons. cost = 16($.33)= $5.28
March 7, 2017

Math
4 pies each needing 1/2 cup of lemon juice ---> we need 2 cups of lemon juice. I have no idea how many "tablespoons" are in a cup, look that up, find out how many tablespoons you need. Remember, you would not be able to buy a partial lemon, so you have to go to ...
March 7, 2017

math
Make an effort to memorize the ratio of sides of both the 30-60-90 and the 45-45-90 right-angled triangles, those values will come up again and again in your study of trig. angles: 30-60-90 sides : 1 - ?3 - 2 angles : 45-45-90 sides : 1 - 1 - ?2 a) so set up a ratio: 1/41 = ?3...
March 7, 2017

math
trusting the way you typed it .... (13-2)squared + (14-12 divided by 3) = 121 + (14 - 4) <---- order of operation, division before subtraction = 121 + 10 = 131
March 7, 2017

Math Help
No, your exponent is incorrect i = .108/4 = .027 but n = 5(4) or 20 periods let the payment be P P (1.027^20 - 1)/.27 = 25,706.30 P(26.06525..) = 25,706.30 P = $986.23 Why wouldn't your answer of $135,662.14 sound totally illogical to you?? You only wanted to accumulate $...
March 6, 2017

mathematics
h = -4.9t^2 + vt + 0, where v = 30sin35° so solve 4.9t^ - 3sin35 t = 0 t(4.9t - 3sin35) = 0 t = 0 , at the start or t = 30sin35/4.9 = appr 3.5 seconds
March 6, 2017

math
John --- x Pam ----- x-8 in 5 years: John --- x+5 Pam --- x-8+5 = x-3 x+5 + x-3 = 40 2x = 38 x = 19 john is now 19 and Pam is 11 check: in 5 years: John is 24, Pam is 16 sum = 24+16 = 40 My answer is correct
March 6, 2017

Algebra I
yes, you are right, my mental error or senior moment.
March 6, 2017

Algebra I
Ignoring the fact that this equation would violate the laws of gravity on earth .... find the vertex in the form (t,h) the value of t is your a) answer, and the value of h is your b) answer. Use the method that was taught to you. c) set -8t^2 + 48t + 160 = 0 divide by -8 t^2...
March 6, 2017

Algebra
?.0064 = .08 ?-.0081 = ?-1?.0081 = i (.09) , which is not a real number which you asked for, so ?-.0081 does not have a real square root
March 5, 2017

math
Well, were you surprised when the result popped out, was it un-expected ??
March 5, 2017

math
Area = ? r^2 circumference = 2?r Area/circumference = ?r^2 /(2?r) = r/2 2(Area) = r(circumference) Area = (r/2)(circumference) as required to show
March 5, 2017

Math
Check Steve's solution for the same question. http://www.jiskha.com/display.cgi?id=1436351642
March 5, 2017

Math- Interest Rates
Assuming this is a simple interest and not a compound interest problem, we are missing the rate a) so she has $4960 b) since I = PRT 960 = 4000(R)(3) R = .08 so 8% interest c) if the rate had been 9% amount = 4000 + 4000(.09)(3) = 5080 So how much more ???
March 5, 2017

Calculus
Just do it term by term the way it stands, the only one to be careful with is the -3xy, since you have to use a product rule 5x^2 - 3xy + 58 = 2y^3 10x - 3x dy/dx -3y + 0 = 6y^2 dy/dx 10x - 3y = 6y^2 dy/dx + 3x dy/dx factor out the dy/dx and just flip the equation dy/dx(6y^2...
March 5, 2017

Math
What method have you learned? There are several.
March 5, 2017

Math
On my computer, I see no figure on the right, just a cup of coffee.
March 5, 2017

Algebra
-3 = x^2 + 4x + 1 x^2 + 4x + 4 = 0 , so a=1, b=4, and c=4 just plug it in.
March 5, 2017

Math
Done
March 5, 2017

Math
Please number your question, and use proper notation for powers 1. x^3 + 8x^2 + 6 = 0 , (I assumed the + sign at the end) Without any work, if we assume it does factor, then any factor CANNOT end in a number which is not a factor of 6, since the 6 can only arrive from the ...
March 5, 2017

Algebra
see my reply here: http://www.jiskha.com/display.cgi?id=1488737021 type 5x2^ as 5x^2 etc so I will read that as, assuming the middle term in the first bracket is 11x (5x^2 + 11x - 9)(-2x^2 -x + 17) = -10x^4 - 5x^3 + 85x^2 - 22x^3 - 11x^2 + 187x + 18x^2 + 9x - 153 = -10x^4 - 27...
March 5, 2017

Algebra
Look at my reply here: http://www.jiskha.com/display.cgi?id=1488737021 You have the same kind of gibberish, please stick to one "name".
March 5, 2017

Algebra
Your notation is not acceptable did you mean y^11 instead of 11^y ? is x a variable or a multiplication sign ? The way you typed it we are dividing by only 560, you will need brackets otherwise. in your answer, -2^ and -15^ are meaningless.
March 5, 2017

math
by our definitions: a + 4d = 21 ---> a = 21-4d ** a+ 9d = 3(a+d) a + 9d = 3a + 3d 2a = 6d a = 3d *** equate ** and *** 3d = 21-4d 7d = 21 carry on
March 5, 2017

Math
You will have 3 similar right-angled triangles. I will list them with matching vertices ABC DBA DAC You can now form any ratio e.g. BC/AB = BA/DB = AC/DA plug in your given values and you can find all sides
March 5, 2017

correction - Advanced Functions
I said: period = 2?/k = 20 min That should have been 20 seconds
March 5, 2017

Advanced Functions
first two bits of information max is 8, min is -8, so a = 8 period = 2?/k = 20 min 20k = 2? k = ?/10 so let's start with h = 8 sin (?/10)t so we have the "shape" of our curve (sketch this from 0 to 20) http://www.wolframalpha.com/input/?i=h+%3D+8+sin+((%CF%80%...
March 5, 2017

Maths
base --- 5x height --- 2x (5x)(2x) = 360 10x^2 = 360 continue, find x, then sub back into my definitions
March 5, 2017

Maths
choices: (1,1) (1,2) (2,1) prob( less than 3) = 3/36 = 1/12
March 5, 2017

math
I read that as y = (x^2 - 3)/?2 dy/dx = (1/?2)(2x) = 2x/?2 let that closest point be P(x,y) so the slope of the tangent at P = 2x/?2 slope of PO = y/x at the closest point, PO is perpendicular to the tangent at P then, y/x = -?2/(2x) y = - ?2/2 for the x: (x^2-3)/?2 = -?2/2 x^...
March 5, 2017

maths
What is (13)(9) - 8^2 ?
March 4, 2017

Algebra 2
(?8+?5)(?8 - ?5) (1 + i?2)(1 -i?2)
March 4, 2017

Algebra word problem
job done = time x rate let job done = 1, since it is a constant John's rate --- 1/12 Mike's rate ---- 1/x combined rate = 1/12 + 1/x = (x+12)/(12x) after John worked for 3 hours job done = 3(1/12) = 1/4 so job left to be done = 3/4 (3/4) / ((x+12)/(12x)) = 5 (3/4)(12x...
March 4, 2017

Math 253 algebra
Ann's rate ---- 1/2 The job is a constant, let job = 1 Job = rate x time sister's rate ----- 1/x combined rate = 1/2 + 1/x = (x+2)/(2x) 1/( (x+2)/2x ) = 5/4 2x/(x+2) = 5/4 8x = 5x+10 3x=10 x=10/3 alone, her sister would take 10/3 hrs or 3 hours and 20 minutes.
March 4, 2017

Algebra
using the vertex: y = a(x+12)^2 - 1 but (-10,5) lies on it, so ... 5= a(2^2) - 1 6 = 4a a = 3/2 y = (3/2)(x + 12)^2 - 1 expand to get the other form
March 4, 2017

Maths
Notice the scale of 1 : 200000 has no units. that means we could use any units, that is, 1 cm on the map represents 200000 cm 1 mm on the map represents 200000 mm 1 inch on the map represents 200000 inches so if 1 cm represents 200000 cm then 2.5 cm represents 2.5(200000) cm ...
March 4, 2017

Calculus Antiderivatives
Any linear function would do How about f(x) = 4x + 5 f ' (x) = 4 Since the derivative of a function represents the slope of that function, and the slope of a straight line is constant, the slope of the function I gave is always 4
March 4, 2017

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