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
232995 Questions
0
1
0
+1858
Number Theory
Find the inverse of $7$ modulo $21$.
LiIIiam0216
Jul 2, 2024
+1
1
2
+58
Let be the twenty (complex) roots of the equation Calculate Note that the addition formula for cotangent is still valid when working
Let be the twenty (complex) roots of the equation
Calculate Note that the addition formula for cotangent is still valid when working with complex numbers.
●
●
Yeetww
Jul 2, 2024
0
1
0
+1858
Number Theory
Which of the residues 0, 1, 2, 3, 4 satisfy the congruence x^5 = 0 mod 5?
LiIIiam0216
Jul 2, 2024
0
1
0
+1858
Number Theory
Which of the residues 0, 1, 2, ..., 11 satisfy the congruence 3x = 1 mod 12?
LiIIiam0216
Jul 2, 2024
Jul 1, 2024
0
1
2
+1858
Number Theory
The numbers $24^2 = 576$ and $56^2 = 3136$ are examples of perfect squares that have a units digits of $6.$
If the units digit of a perfect square is $5,$ then what are the possible values of the tens digit?
●
●
LiIIiam0216
Jul 1, 2024
0
1
1
+1858
Number Theory
A four-digit hexadecimal integer is written on a napkin such that the units digit is illegible. The first three digits are 2, $F$, and 1. If the integer is a multiple of $19_{10}$, what is the units digit?
●
LiIIiam0216
Jul 1, 2024
0
1
1
+1858
Number Theory
If n = 43 mod 60, what is the residue of n modulo 7?
●
LiIIiam0216
Jul 1, 2024
0
1
1
+1858
Algebra
Determine all of the following for $f(x) \cdot g(x)$, where $f(x) = -x^2+ 8x - 5$ and $g(x) = x^3 - 11x^2 + 2x$.
Leading term
Leading coefficient
Degree
read more ..
●
LiIIiam0216
Jul 1, 2024
+1
1
2
+10
Interval Notation
For what real values of x is -4 < x^4 + 4x^2 < 21 satisfied? Express your answer in interval notation.
NotThatSmart
●
●
AHGSIGMA
Jul 1, 2024
0
1
1
+287
Number theory
How many of the 1000 smallest positive integers are congruent to 1 modulo 9? Can you also explain what a modulo is?
●
Lilliam0216
Jul 1, 2024
0
1
1
+136
Coordinates
Let $a$ and $b$ be real numbers, where $a < b$, and let $A = (a,a^2)$ and $B = (b,b^2)$. The line $\overline{AB}$ (meaning the unique line that contains the point $A$ and the point $B$) has slope $2$. Find $a + b$.
●
BRAlNBOLT
Jul 1, 2024
0
1
1
+136
Coordinates
Let $O$ be the origin. Points $P$ and $Q$ lie in the first quadrant. The slope of line segment $\overline{OP}$ is $4,$ and the slope of line segment $\overline{OQ}$ is $5.$ If $OP = OQ,$ then compute the slope of line segment $\overline{PQ}.$
Note:
read more ..
●
BRAlNBOLT
Jul 1, 2024
0
1
1
+136
Coordinates
Points $A,$ $B,$ and $C$ are given in the coordinate plane. There exists a point $Q$ and a constant $k$ such that for any point $P$,
PA^2 + PB^2 + PC^2 = 3PQ^2 + k.
If $A = (7,-11),$ $B = (10,13),$ and $C = (18,-22)$, then find the constant
read more ..
NotThatSmart
●
BRAlNBOLT
Jul 1, 2024
0
1
3
+506
Algebra
Let a and b be complex numbers. If a + b = 4 and a^2 + b^2 = 6 + ab, then what is a^3 + b^3?
●
●
●
booboo44
Jul 1, 2024
0
1
1
+438
Geometry
In right triangle $ABC,$ $\angle C = 90^\circ$. Median $\overline{AM}$ has a length of 1, and median $\overline{BN}$ has a length of 1. What is the length of the hypotenuse of the triangle?
NotThatSmart
●
RedDragonl
Jul 1, 2024
0
1
2
+438
Geometry
In triangle $PQR,$ $M$ is the midpoint of $\overline{QR}.$ Find $PM.$
PQ = 5, PR = 8, QR = 11
●
●
RedDragonl
Jul 1, 2024
0
1
3
+22
Help
A packet of chocolates contains pieces of milk, dark and orange chocolates. 25% of the chocolates are dark chocolates. The ratio of the number of dark chocolates to the number of milk chocolates is 5:7. There are 78 pieces of dark and orange chocolates.
read more ..
NotThatSmart
●
●
●
derpmcfearson
Jul 1, 2024
0
1
1
+719
Number Theory
Let $p$ be a prime. What are the possible remainders when $p$ is divided by $17?$ Select all that apply.
●
bingboy
Jul 1, 2024
0
1
1
+1206
Geometry
In triangle ABC, the angle bisector of angle BAC meets BC at D, such that AD = AB. Line segment AD is extended to E, such that angle DBE = angle BAD = 17 degrees. Find angle ABD.
●
blackpanther
Jul 1, 2024
0
1
0
+438
Geometry
In triangle $ABC$, points $D$ and $F$ are on $\overline{AB},$ and $E$ is on $\overline{AC}$ such that $\overline{DE}\parallel \overline{BC}$ and $\overline{EF}\parallel \overline{CD}$. If $CE =3$ and $DF = 3$, then what is $BD$?
RedDragonl
Jul 1, 2024
0
1
1
+438
Geometry
In quadrilateral $BCED$, sides $\overline{BD}$ and $\overline{CE}$ are extended past $B$ and $C$, respectively, to meet at point $A$. If $BD = 8$, $BC = 3$, $CE = 1$, $AC = 19$ and $AB = 13$, then what is $DE$?
●
RedDragonl
Jul 1, 2024
0
1
0
+685
Number Theory
How many bases b \ge 2 are there such that 100_b + 1_b is prime?
eramsby1O1O
Jul 1, 2024
0
1
1
+685
Number Theory
Find the 4000th digit following the decimal point in the expansion of \frac{1}{17}.
●
eramsby1O1O
Jul 1, 2024
«
latest
9318
9317
9318
9317
9316
9315
9314
..
2
1
»
Post New Question
0 Online Users
Top Users
+129657
CPhill
moderator
+118629
Melody
moderator
+33616
Alan
moderator
+14966
asinus
moderator
+12530
Omi67
moderator
+3145
admin
administrator
+2487
GingerAle
+1858
LiIIiam0216
+1847
tomtom
+1682
bader
+1367
parmen
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.