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
236046 Questions
0
25
0
+816
Counting
At a meeting, $5$ scientists, $2$ mathematicians, and a journalist are to be seated around a circular table. How many different arrangements are possible if each scientist must sit next to a mathematician? (Two seatings are considered equivalent
read more ..
maximum
Dec 14, 2023
0
28
1
+816
help plz
Four children and four adults are to be seated at a circular table. In how many different ways can they be seated if all the children are next to each other, and all the adults are next to each other? (Two seatings are considered the same if
read more ..
●
maximum
Dec 14, 2023
0
21
1
+816
need help
I have $4$ different mathematics textbooks and $3$ different psychology textbooks. In how many ways can I place the $7$ textbooks on a bookshelf, in a row, if there must be a mathematics textbook exactly in the middle, and all the psychology textbooks are
read more ..
●
maximum
Dec 14, 2023
0
12
1
+816
Counting
A speech class has $4$ freshmen and $3$ sophomores. (Everyone is distinguishable.) In how many ways can they stand in line, so that all the freshmen are standing together?
●
maximum
Dec 14, 2023
-1
50
0
+1768
help with geometry
Two rectangles overlap, as shown below. Find the area of the overlapping region (which is shaded) if $AB = BE = 3$ and $FB = BC = 3.$
bader
Dec 14, 2023
0
32
0
+1768
Rectangle
A rectangle contains a strip of width $1,$ as shown below. Find the area of the strip.
bader
Dec 14, 2023
0
39
1
+1768
Geometry
An equilateral triangle is constructed on each side of a square with side length $2,$ as shown below. The four outer vertices are then joined to form a large square. Find the area of the shaded region.
●
bader
Dec 14, 2023
0
44
1
+1768
Geometry
Rectangle $ABCD$ contains a point $X$ such that $AX = 3$, $BX = 3$, and $CX = 3$. Find $DX$.
●
bader
Dec 14, 2023
Dec 13, 2023
0
45
0
+1768
Rectangle
The perimeter of a rectangle is $40,$ and the length of one of its diagonals is $10 \sqrt{2}.$ Find the area of the rectangle.
bader
Dec 13, 2023
0
34
1
+1768
Rhombus
In a rhombus, all the side lengths are $12,$ and one of the angles is equal to $90^\circ.$ Find the area of the rhombus.
●
bader
Dec 13, 2023
0
29
1
+1768
Quadrilateral
In quadrilateral $PQRS$, $PQ = QR = RS = SP$, $PR = \sqrt{2}$, and $QS = \sqrt{2}$. Find the perimeter of $PQRS$.
●
bader
Dec 13, 2023
-1
40
1
+1521
Triangles
As shown in the diagram $\angle BAC=90^\circ$. Let $X$ be the foot of the altitude from $A$ to $\overline {BC}$, $\overline{AY}$ be the bisector of $\angle BAC$, and $\overline{AZ}$ be the median of $\triangle ABC$. If $\angle BAY = 16^\circ$, then
read more ..
●
blackpanther
Dec 13, 2023
-1
42
0
+1521
Angle Bisectors
Angle bisectors $\overline{AX}$ and $\overline{BY}$ of triangle $ABC$ meet at point $I$. Find $\angle C,$ in degrees.
blackpanther
Dec 13, 2023
+3
25
1
+180
In triangle ABC, cos A=sqrt frac (7/10) and cos B=sqrt (3/10) Find cos C
In triangle ABC, cos A=sqrt frac (7/10) and cos B=sqrt (3/10) Find cos C
●
itsash
Dec 13, 2023
+2
24
1
+180
compute cos^2 1 +cos^2 2 +cos^2 3 ... +cos^2 89 (in degrees)
compute cos^2 1 +cos^2 2 +cos^2 3 ... +cos^2 89 (in degrees)
●
itsash
Dec 13, 2023
+2
30
1
+180
compute tan 45/2 (degrees)
compute tan 45/2 (degrees)
●
itsash
Dec 13, 2023
-1
30
1
+1521
Triangle
In triangle $ABC,$ let the angle bisectors be $\overline{BY}$ and $\overline{CZ}$. Given $AB = 12$, $AY = 12$, and $AC = 12$, find $BZ$.
●
blackpanther
Dec 13, 2023
-1
39
1
+1521
Triangle
In triangle $ABC,$ let the angle bisectors be $\overline{BY}$ and $\overline{CZ}$. Given $AB = 12$, $AY = 12$, and $AC = 12$, find $BC$.
●
blackpanther
Dec 13, 2023
-1
44
0
+1521
Geometry
In triangle $PQR,$ $M$ is the midpoint of $\overline{PQ}.$ Let $X$ be the point on $\overline{QR}$ such that $\overline{PX}$ bisects $\angle QPR,$ and let the perpendicular bisector of $\overline{PQ}$ intersect $\overline{PX}$ at $Y.$ If $PQ
read more ..
blackpanther
Dec 13, 2023
-1
51
0
+1521
Triangle
For the triangle below, let $x$ be the area of the circumcircle, and let $y$ be the area of the incircle. Compute $x - y.$
blackpanther
Dec 13, 2023
0
26
1
+14
HELP MEEE
Find the greatest whole number that will satisfy this inequality: .
●
Ayobruh
Dec 13, 2023
0
31
0
+1678
Integers
Find the number of ordered pairs $(a,b)$ of integers such that
\frac{a + 2}{a + 1} = \frac{b}{8}.
wiseowl
Dec 13, 2023
0
33
0
+1678
Algebra
Find the largest value of $x$ such that $3x^2 + 17x + 15 = 2x^2 + 21x + 12 - 5x^2 + 17x + 34.$
wiseowl
Dec 13, 2023
0
42
0
+1678
help with quadratic
Fill in the blanks to make a quadratic whose roots are $1$ and $-1.$
x^2 + ___ x + ___
wiseowl
Dec 13, 2023
«
latest
9440
9439
..
9066
9065
9064
9063
9062
..
2
1
»
Post New Question
1 Online Users
Top Users
+129899
CPhill
moderator
+37153
ElectricPavlov
+33661
Alan
moderator
+15000
asinus
moderator
+2511
GingerAle
+2499
Solveit
+1938
NotThatSmart
+1557
parmen
+1521
blackpanther
+1455
kittykat
+1310
learnmgcat
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.