Register
Login
Username
Password
Login
forgot your password?
Home
Forum
+0
Formulary
Maths
Help
Complex Numbers
Integral Calculus
Differential Calculus
Equations
Graphs
Linear Algebra
Number theory
Percent
Standard Functions
Statistics
Trigonometry
Unit Conversion
Units
About
Imprint
Privacy Policy
Terms of Service
Credits
Google+
Facebook
Contact Email
Post New Question
All Questions
+0
229705 Questions
+1
643
1
probability help
Dimitri places the maximum possible number of Rooks on a 8 by 8 chessboard in such a way that there's no two Rooks that attack each other. In how many ways can he do that?
●
Guest
Dec 28, 2019
0
685
1
help
In the figure below, there are 6 squares: 4 small, 1 medium (in blue), and 1 large. There are 9 circles, which will be filled with all the integers 1 through 9 such that the sum of the vertices of each square is 20.
What
read more ..
●
Guest
Dec 28, 2019
0
375
1
help
Find all acute angles x such that cos(3x)*cos(x) + sin(3x)*sin(x) = cos(3*pi/5).
●
Guest
Dec 28, 2019
Dec 27, 2019
0
1430
1
Help!
The graphs of and are drawn. For every , a vertical segment connecting these two graphs can be drawn as well. Find the smallest possible length of one of these vertical segments.
●
Guest
Dec 27, 2019
0
714
3
help please
Four mathematicians, three physicists, and an engineer are to be seated equally spaced around a circular table. How many different arrangements are possible if the mathematicians must all sit together (in four consecutive seats) and the physicists must
read more ..
●
●
●
Guest
Dec 27, 2019
0
333
0
help
The number is a root of x^3 + ax^2 + bx + c = 0, for some integers a, b, and c. Find the ordered triple (a,b,c).
Guest
Dec 27, 2019
-1
731
1
+152
Help
What is the value of c if x(3x+1) \(x\in \left(-\frac{7}{3},2\right)\)
●
BIGChungus
Dec 27, 2019
+8
955
6
+382
Factorials
1. The number obtained from the last two nonzero digits of 2019! is equal to 𝑛𝑛. What is 𝑛𝑛?
2. The number obtained from the last two nonzero digits of 2019! is equal to 𝑛𝑛. What is 𝑛𝑛?
●
●
●
●
●
●
hellospeedmind
Dec 27, 2019
0
771
3
help
Solve sqrt(a) + b = 7, sqrt(b) + a = 11
●
●
●
Guest
Dec 27, 2019
0
742
2
help
A yellow circle circumscribes a green regular hexagon and is inscribed in a red regular hexagon.
What is the ratio of the areas of the green hexagon to the red hexagon?
read more ..
●
●
Guest
Dec 27, 2019
0
382
0
help
he 2 green points in the diagram are the midpoints of 2 adjacent sides of a regular hexagon.
Which is larger, the red area or the blue area?
read more ..
Guest
Dec 27, 2019
0
2
672
1
help
A polyhedron has 30 faces and 62 edges. How many vertices does the polyhedron have?
●
Guest
Dec 27, 2019
0
1262
1
+24
Please Help! Thank you.
1. A regular dodecagon is inscribed in a circle with radius 1. Compute
(The sum includes all terms of the form , where )
2. In the diagram, , arc XY is , and arc VW is . Find arc WY, in degrees. (view diagram)
read more ..
●
Elen8
Dec 27, 2019
0
689
1
+24
View Question - Help. Thank you.
1. In cyclic quadrilateral PQRS, angle P/2 = angle Q/3 = angle R/4. Find the largest angle of quadrilateral PQRS, in degrees.
●
Elen8
Dec 27, 2019
0
891
1
PLZ HELP THX
Two jokers are added to a 52 card deck and the entire stack of 54 cards is shuffled randomly. What is the expected number of cards that will be strictly between the two jokers?
read more ..
●
Guest
Dec 27, 2019
0
1536
2
Help
Lance has a regular heptagon (7-sided figure). How many distinct ways can he label the vertices of the heptagon with the letters in OCTAGON if the N cannot be next to an O ? Rotations of the same labeling are considered equivalent.
●
●
Guest
Dec 27, 2019
0
400
2
help
What is the number of integers greater than 6000 that can be formed using the digits 3,5,6,7 and 8 without repetition?
●
●
Guest
Dec 27, 2019
+1
1066
1
+312
COUNTING & PROBABILITY
It is a beautiful day at the beach and ten beach volleyball players have shown up at the volleyball courts. Each two-person volleyball team should consist of a setter and a spiker. Five of the players prefer to be a spiker, four of the players prefer to
read more ..
●
mathleteig
Dec 27, 2019
0
638
1
help
Solve sqrt(4x - 3) + 10/sqrt(4x - 3) = 7.
●
Guest
Dec 27, 2019
0
639
2
help
Area shaded region of the triangle ABC is 80 sq. units, what is the area of triangle ABC?
●
●
Guest
Dec 27, 2019
0
548
1
help
Let n be a positive integer.
(a) Prove that
by counting the number of ordered triples (a,b,c) where in two different ways.
(b) Prove that
by counting the number of subsets of containing three different numbers in
read more ..
●
Guest
Dec 27, 2019
+1
702
2
help
A rhombus is inscribed in a circle with radius r and center O such that one of the vertices lies on O and rest lie on the circumference of the circle.
Find the area of the rhombus in terms of r.
read more ..
●
●
Guest
Dec 27, 2019
-1
756
2
+152
Help
1)A parabola with equation y=ax^2+bx+ccontains the points (3,-3), (1,3), and (0,0) Find the value 100a+10b+c
2) In terms of pi, what is the area of the circle defined by the equation 2x^2+2y^2+10x-6y-18=0
I'm sorry for giving out
read more ..
●
●
BIGChungus
Dec 27, 2019
«
latest
9187
9186
..
6197
6196
6195
6194
6193
..
2
1
»
Post New Question
4 Online Users
Top Users
+128057
CPhill
moderator
+118587
Melody
moderator
+33603
Alan
moderator
+14865
asinus
moderator
+3143
admin
administrator
+2436
GingerAle
+1703
tomtom
+1670
wiseowl
+1618
proyaop
+1248
bader
+1014
blackpanther
Sticky Topics
Some guidelines for question askers.
What is Happening 5
Again a number puzzle. Multiply in writing.
Loads of fun printable number and logic puzzles
¤¤¤¤Welcome To Web2.0calc¤¤¤¤
How to display latex properly
Feature Questions 1 - Started 8th May 19
How to upload a picture.
If a question is ticked that does not mean you cannot continue it.
Should you consider anything before you answer a question?
Geometry Thread
PUZZLES
LaTex Coding
/calculator/bsh9ex1zxj
Historical post!
What is happening? Wrap #4
Great Questions to Learn From 2
Great Answers to Learn From
Reference Material
Information for new people.