I Know

This page lists questions and answers that were posted by visitors named I Know.

Questions

The following questions were asked by visitors named I Know.

Just stop it with the creation of all those silly round-off questions. They have been appearing for days now and are just produced by the AI. Surely the bot doesn't need all those cases so it can "learn" how to do them. There are simple rules that can be...

What is going on? I counted 21 postings in the last hour titled "public finance" by the same "student" They are not really questions, simply statements like "Reasons for market failure", and the AI then gives some canned reply. It looks like The AI is gen...

Answers

The following answers were posted by visitors named I Know.

g(x) = ax(x-1)(x-2)(x-3)(x-4) f(x) = g(x) + x + 1 We are told: f(5) = 25 g(5) = 5a(4)(3)(2)(1) = 120a f(5) = g(5) + 5 + 1 = 25 120a = 19 a = 19/120

You need a simple ratio: h/35 = 6/5 h = 35(6/5) = 42 , not 30

(8.59 + 10.3 + 10.67 + 12.5 + 27)/5 = 13.812 , not 13.924 The outlier of 27 should be questioned.

As long as the sum of the terms of the ratios divides evenly into 72, the ratio is possible. for 4:1, the sum would be 5, and 5 does not divide evenly into 72 so the ratio we cannot have is (1) 4:1 5:7 would work .... Broken : not broken = 5 : 7 or 5x : 7...

After spending 40% on school bag, 60% would be left, but he then spends 2/5 of that on stationary. 2/5 of 60% is 24%, leaving him with 36% of the original money. e.g. suppose he has $100, spends 40% or $40 on bag leaves him with $60 spends (2/5) of $60 or...

Several errors in the check of the above solution: I especially like the last line of 360 - 224 = 360 marbles ..... let the original number of marbles be x Ali took 1/6 of x or x/6 Benny took 2/9 of x or 2x/9 sofar x/6 + 2x/9 were taken = 7x/18 were taken...

dolphins - jags = 2x-7 - (5x-3) = -3x - 4

The question probably was to "prove it", not to agree or disagree with the statement. LS = (1+tan^2A)/(1+cot^2A) = sec^2 A/csc^2 A) = sin^2 A/cos^2 A = tan^2 A RS = ((1-tanA)^2)/(1-cotA)^2 = ( (1 - tanA)/(1 - cotA) )^2 = [ ( 1 - sinA/cosA)/(1 - cosA/sinA)...

5 1/4 ÷ 5/8 = 21/4 ÷ 5/8 = (21/4)(8/5) = 42/5 = 8.4 bags so he can fill 8 bags, not enough for a 9th one

Used to be called SSS, probably still is. If corresponding sides of the two triangles are equal, then you don't actually care about the angles.

gross pay = 32*12.50 = £ 400 net pay = 80% of 400 = £ 320 insurance + 280 = 320 insurance = £ 40 rate = 40/400 = 10%

see post following this

That answer makes no sense. Not enough data.

from L + f = 19 L - f = 3 much easier to just add them: 2L = 22 L = 11 then 11 + f = 19 f = 8

Unless it was supposed to be as typed .... f(x)=3/x+1 or y = 3/x + 1 switcheroo x = 3/y + 1 xy = 3 + y xy - y = 3 y(x-1) = 3 y = 3/(x - 1) or f^-1(x) = 3/(x - 1)

You might add that a function f(x) and its inverse f^-1 (x) are a reflection of each other in the line y = x

Makes no sense. No mention was made of point P.

not enough information

No A(1,4), B(1,2), C(6,2) You need right-bisectors of any two sides we have a vertical side AB and a horizontal side BC so the circumcentre must be (3.5, 3)

no, incorrect again 2.9n + 1.7 = 3.5 + 2.3n .6n = 1.8 n = 1.8/.6 = 3

What is f(x)=4x−−√−1 supposed to be ?

Nope The circumcentre cannot lie on one of the sides, you wouldn't have a triangle.

I will assume you meant: f(x)=5/(x+2)−4 or y = 5/(x+2)−4 inverse: x = 5/(y+2) - 4 x + 4 = 5/(y+2) xy + 2x + 4y + 8 = 5 xy + 4y = -2x - 3 y = (-2x - 3)/(x + 4) or f^-1 (x) = (-2x - 3)/(x + 4) check: let x = 3, f(x) = 5/5 - 4 = -3 f^-1 (-3) = (-2(-3) - 3)/(...

Answer is not possible

g*3-5*2+8 = 3g - 10 + 8 = 3g - 2

same question as before, except now g = 3 g*3-5*2+8 = 3*3 - 10 + 8 = 9 - 10 + 8 = 7 where does h enter the picture?

NO area of original = 3*4 = 12 cm^2 area of new one = 6*8 = 48 cm^2 or the areas of similar figures are proportional to the square of their side old : new = 1^2 : 2^2 = 1 : 4 so 4 times as big

180(n-2) = 1800 n-2 = 10 n = 12 each interior angle = 1800/12 = 150° or ... each exterior angle of the 12-gon = 360/12 = 30° which would make the interior angle 180-30 or 150°

nope, ...... number of pages still to be read = 363 - 195 = 168 at a rate of 28 pages/hr, this will take 168/28 or 6 hours

That answer makes no sense besides that: 0.5 weeks ?

h^2+ 36^2 = 42^ h^2 = 468 h = 21.6, so the closest would be C. 22

ax=b(c+x) ax = bc + bx ax - bx = bc x(a - b) = bc x = bc/(a - b)

The above answer is incorrect 5.4 + 0.2x = –1.4x + 8.6 .2x + 1.4x = 8.6 - 5.4 1.6x = 3.2 x = 2

The above answer is incorrect 5.4 + 0.2x = –1.4x + 8.6 .2x + 1.4x = 8.6 - 5.4 1.6x = 3.2 x = 2

The above answer is incorrrect number sold last year ----- x 2x - 1 = 35 2x = 36 x = 18 Last year she sold 18 packages

The above answer is incorrect weight of sister --- x x + 74 = 3x + 6 2x = 68 x = 34 check: combined weight = 74 + 34 = 108 3 times sisters weight = 102 and the combined weight would be 6 more than 102 My answer is correct

incorrect you divided by -5 so the > becomes < p < 6

correct, 7/8 + 1/2 = 7/8 + 4/8 = 11/8

Assuming that all 4 sides are open, and you added 4 feet to only the length, original perimeter = 2(7+12) = 38 now you added 8 ft, so new perimeter = 38+8 = 46 ft

Not necessary to write 11/8 as 1 3/8. Both represent the same number, as a matter of fact, 1 3/8 is actually a "useless" notation, since for most arithmetic calculations you would have to change it to 11/8

Gee, what is 3 * 10 ????

Can't be answered. Where is X ??

Can't be answered. Where is W ??

oops, read that wrong. shorter : whole length = 1 : 3

Why not just say A(2,6) , B(8,6) and C(6,2) we need the intersection of altitudes. since AB is horizontal, x = 6 is the altitude from C to AB Slope of AC = -1, so slope of altitude from B to AC = +1 equaltion of that altitude: y = x + b (8,6) lies on it 6...

As soon as you make a sketch, it is obvious that the answer above is incorrect. It is a right-angled triangle, so .....

No! 1/2 + 1/3 + 1/12 = 11/12 , not 4/6 These is sometimes called "Egyptian Fractions" where the numerators are each equal to 1. 4/6 = 2/3 = 1/2 + 1/6

NO again! instead of saying "add 4 subtract 1" , why not just add 3 So your terms would be 5, 8, 11, .... an AP with a = 5 and d = 3 term(10) = a + 9d = 5 + 9(3) = 32

No comparison equations were given, so who's to tell ?

Missing data. It said the frog jumped 3 times, but only the first and last were given. Question can't be answered. The bot appears to have made an attempt to just add the first and third, incorrectly I must say.

NO, the question can't be answered, due to lack of data. How long is the crayon? Need the length to find volume of the cylinder.

62 1/2 of x is 5 what is x ?? as you typed it .... 125/2 x = 5 125x = 10 x = 10/125 = 2/25 Did you mean: 62% of x is 5 ?? then .62x = 5 x = 5/.62 = 250/31

NO 2.3 = 2 3/10 2/5 = 0.4

Ignoring the poor grammar in the question, we want the LCM of 7 with 2 which would be 14, not 9 e.g. days of enrichment: 7, 14, 21, 28, ... days for bath: 2, 4, 6, 8, 10, 12, 14, 16 so the first number showing up on both lists is 14

8x/6y = 4k or 4x/3y = 2k , where x is the numerator and y is the denominator

16 is NOT a multiple of 3 multiples of 3: 3, 6, 9, 12, 15, 18, ... oops, 16 is not there

NOOOO 15x + 10 = 5(x + 2)

Wrong answer!!! cost of items = 32*1.4 + 32*.59 = 63.68 amount left over = 80 - 63.68 = $16.32

Question makes no sense to me

I agree It got the right answer, although it would have been nice to show the steps.

Wrong as before... 2x - 15 can't be factored

GCF of 32a and 48b is 16

Not really! -6q+5.8=238 -6q = 232.2 q = - 38.7

Can't be answered with the data given.

both answers are wrong: 90x - 15 = 15(6x - 1)

Question cannot be answered, since no diagram can is shown.

wrong! 1080, 180, 30, 5 divide a term by 6 to get the next one.

Wrong! Look at my answer , two of your posts above this

Wrong! 4(6+8) = 4*14 = 56

It asked for scale. in expressing a scale, no units are shown, since the numbers are to represent the same units, we skip the units (divide by the unit) 7/8 miles corresponds with 3/10 inches <------ that was given 1 mile corresponds with (3/10) ÷ (7/8) i...

Wrong again!! B is the obvious equation. m = 32.65 C would have an answer of m = 143.25, which of course is wrong.

Wrong again!!! clearly D ! original - discount = final x - 8.04 = 24.95 x = 32.99

Ok up to "This gives us 375 + 28 = x" Then the first part of the next sentence is nonsense but x = 403 is the correct answer

Wrong! if he gave each of them 32 , then he had 4*32 or 128 cards to start with

Wrong, the bot's sunflower would be shrinking, not growing. original height --- x x + 12.1 = 65 x = 65-12.1 = 52.9

Good Grief!!!! 4y = 60 y = 15

Not quite!! number of miles after the first ---- n 3.5n + 5 = 19 3.5n = 14 n = 4 So his ride was 5 miles. check: 1(5) + 4(3.5) = 19

Not quite! First of all in the original, which is not a question but merely a statement, it said: for y = 6x + 7 "the slope is 6 and the x-intercept is 7, so the equation is y = 6x + 7." That should be the y-intercept is 7, not the x-intercept secondly, a...

Totally wrong if the x-intercept is 7, we have the point (7,0) and if the slope is 6 y - 0 = 6(x - 7) y = 6x - 42

So close, and then it messes it up! for the 2 points (1,3) and (6,-2) slope = (-2-3)/(6-1) = -5/5 = -1 since the slope is supposed to be 3, as given, this question is flawed. The equation would be y-3 = -1(x - 1) y - 3 = -x + 1 y = -x + 4 Don't know how o...

we have two points (950,8) and (900,10) slope = (10-8)/(900-950) = 2/-50 = -1/25 if n is the number of canned hams, and C is the cost C -1/25 n + b but (900,10) satisfies this 10 = -1/25*900 + b b = 46 Cost = (-1/25)n + 46 check: is (900,10) on this ? LS...

Wrong again! y - 3 = 7(x + 1) y - 3 = 7x + 7 y = 7x + 10

Same question as the one above it. This one is right, but the bot got the next same question wrong. Strange

(gadgets, cost) = A(1050,5) for B(900,9) slope = (9-5)/(900-1050) = 4/-150 = -2/75 c = -2/75 g + b for (900,9) 9 = -2/75(900) + b b = 33 cost = (-2/75)g + 33 12 = -2/75 g + 33 -2/75 g = -21 g = 787.5 or 788 rounded to the next whole number

NOPE y + 6 = 4(x+7) y + 6 = 4x + 28 y = 4x + 22

Messed up the last part c) 125 + 5n ≤ 275 5n ≤ 150 n ≤ 30

NOPE! GCF means greatest common factor the GCF of 30w and 70w = 10w

NOPE the GCF of 20 and 45x is 5

I don't agree with the bot 4/3 π r^3 = 48 r^3 = 11.459 r = 2.2545 <--- radius of sphere V of cyl = π r^2 h = π(2.2545^2)(4.509) = 71.9999 or 72 m^3

So close ! V = (4/3)π 3^3 = 36π = 113 to the nearest whole number

Close again! SA = 4π r^2 7.84π = 4π r^2 1.96 = r^2 r = 1.4 ft, not 1.5 ft

nope! V of cone = (1/3) π (13^2)(27) = 1521π = appr 4778.36 inches^3

NO again, the bot is using the wrong formula Vol of cylinder = π r^2 h = π(4^2)(16) inches^3 = appr 804.2 inches^2

given: volume of cone = 4 height of cone = 2r volume of cone = (1/3)π r^2 (2r) = 2/3 π r^3 = 4 π r^3 = 6 total volume = (1/2)(4/3)πr^3 + (1/3)π(r^2)(2r) = (2/3) π r^3 + (2/3)π r^3 = (4/3)(6) = 8 in^3

Wrong again! SA = π rs, where s is the slant height, r is the radius = π(7)(20) = appr 439.82 in^2

Ohh, so close Area = 2π rh = 2π(4)(3) = 24π or appr 75.4 ft^2

Now finishing the question: plug in the 3 points 20 = 2a + b/2 + c or 40 = 4a + b + 2c 16 = 3a + b/3 + c or 48 = 9a + b + 3c 14 = 5a + b/5 + c or 70 = 25a + b + 5c subtract the 1st from the 2nd -> 5a + c = -4 subtract the 2nd from the 3rd -> 16a + 2c = -2...