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All Questions
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230453 Questions
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234
1
Counting problem
Jeff is choosing three numbers from the set {1, 2, 3, ..., 12}. How many ways can Jeff choose three numbers, so that no two chosen numbers are consecutive?
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Guest
Nov 13, 2021
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377
1
mol/183.18g x 6.022E24
mol/183.18g x 6.022E24
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Guest
Nov 13, 2021
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241
2
COCO:
COCO:
water: 1.5£ , whereas 73% like it
read more ..
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Guest
Nov 13, 2021
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237
1
Pyramid
Rectangle ABCD is the base of pyramid PABCD. If AB = 8, BC = 4, $PA \perp AD$, $PA \perp AB$, and PB = 19, then what is the volume of PABCD?
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Guest
Nov 13, 2021
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219
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help math
What is the smallest positive n such that n/2010 + n/7 is a terminating decimal?
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Guest
Nov 13, 2021
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177
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math question
What is the equation of the line that is parallel to the line y -1 =4(x+3) and passes through the point (4,23)
Guest
Nov 13, 2021
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259
2
Help, I got 320/3 and it's not a valid answer choice
I'm trying to solve this problem
On a certain high-speed railway line, all trains have the same length and all travel at the same constant speed, faster than I walk. Suppose I start walking east from a certain point, crossing an eastbound train
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Guest
Nov 13, 2021
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312
1
Counting
In how many ways can you spell the word FOOT in the grid below? You can start on any letter F, then on each step you can step one letter in any direction (up, down, left, right, or diagonal)
\begin{array}{cccc} F & F &
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Guest
Nov 13, 2021
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189
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Math problems
1. Nine points are arranged in a 3 x 3 grid, as shown below. In how many different ways can you choose three points, so that they form a triangle?
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Guest
Nov 13, 2021
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189
1
Geometry
I is the incenter of ABC. We have CE = 12, AE = 9, and AB = 15. Find BC.
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Guest
Nov 13, 2021
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299
1
Math competition
In Fizic school there was a math competition, with 5/7 of the students in the whole high school participating.
There were 3 rounds to master in order to win the tournament.
From the first to the 2nd round only 1/6 of the whole students who
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Guest
Nov 13, 2021
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198
0
Help!
(a) There was terrible traffic on the highway, and Kiran drove to work at 15 miles per hour. How fast would he need to drive home for the average speed for his round trip commute to be 25 miles per hour? (b) Seetha drove to work at 30 miles per hour. How
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Guest
Nov 13, 2021
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223
3
Find the eigenvalues and eigenvectors of a lenean operator defined in some basis by the matrix A.
Find the eigenvalues and eigenvectors of a lenean operator defined in some basis by the matrix A.
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Guest
Nov 13, 2021
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301
3
Thomas' marbles
Thomas has brought 189 small marbles,
his friend Jonas wants 60 marbles,
but he only got 8/48 of the marbles he wanted. How many marbles did Jonas get?
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Guest
Nov 13, 2021
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175
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Coordinates
The line y=(3x+20)/4 intersects a circle centered at the origin at A and B. We know the length of chord AB is 24. Find the area of the circle.
Guest
Nov 13, 2021
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318
4
Coordinates
Find the distance between (3,-4) and the line 4x+8y+7=0.
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Guest
Nov 13, 2021
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299
1
Coordinates
Let P be a point on the graph of equation, (x-94)^2 + (y-4)^2 = 44^2. What is the shortest possible distance between P and the x-axis?
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Guest
Nov 13, 2021
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447
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Algebra
Suppose that a, b, and c are real numbers such that a/b = sqrt(10)/sqrt(21) and b/c = sqrt(14)/sqrt(15). Find a/c. Completely simplify and rationalize the denominator.
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Guest
Nov 13, 2021
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222
1
Counting
In how many ways can 45 cents be made using any combination of quarters, dimes, nickels, and pennies?
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Guest
Nov 13, 2021
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285
1
Counting problem
How many positive integers less than 1000 have at least one digit of 9?
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Guest
Nov 13, 2021
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468
1
The square root of 2x is greater than 3 and less than 4. How many integer values of x satisfy this condition?
The square root of 2x is greater than 3 and less than 4. How many integer values of x satisfy this condition?
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Guest
Nov 13, 2021
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608
1
let g be the function defined by g(x)=(x^2 -x +1) e^x . What is the absolute maximum value of g on the interval [-4,1]?
let g be the function defined by g(x)=(x2 -x +1) ex. What is the absolute maximum value of g on the interval [-4,1]?
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Guest
Nov 13, 2021
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