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
230838 Questions
0
90
0
Counting
Help I need help with this
I run a book club with n people, not including myself. Every day, for 100 days, I invite members in the club to review a book. What is the smallest positive integer n so that I can avoid ever having the
read more ..
Guest
Jan 24, 2023
0
84
0
Expected value
What do I do here help me
Suppose we have a bag with 10 slips of paper in it. Eight slips have a 3 on them and the other two have a 5 on them.
read more ..
Guest
Jan 24, 2023
0
98
0
Probability
Probability is hard for me
Let PQR be an equilateral triangle, centered at O. A point X is chosen at random inside the triangle. Find the probability that X is closer to O than to any of the sides. (In
read more ..
Guest
Jan 24, 2023
0
82
0
Counting
How to get started on this
Find the number of ways of placing 4 balls in 5 boxes if the balls are distinguishable and the boxes are indistinguishable.
Guest
Jan 24, 2023
0
81
0
Probability
Help meee hard problems
Valeria has three coins, each of which has a probability of 1/2 of coming up heads. On her first turn, she flips all three coins. If all three come up heads, then she stops. Otherwise, for her second turn,
read more ..
Guest
Jan 24, 2023
0
90
0
Counting problem
What do I do here
Sam wants to color the three sides of an equilateral triangle. He has two different colors to choose from. In how many different ways can Sam color the sides of the triangle? (Two colorings are
read more ..
Guest
Jan 24, 2023
0
88
0
Counting
Help I need this
Find the number of ways of arranging the numbers 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 in a row so that the product of any two adjacent numbers is even or a mutliple of 3
Guest
Jan 24, 2023
0
98
2
Precalc Help Plz Help ASAP
Let theta be an angle such that cos(theta) = -1/9 and 0 <= theta <= 2pi.
Assume that cos(theta/2) < 0. Then if:
read more ..
●
●
Guest
Jan 24, 2023
0
84
0
Algebra
Plz help answers needed quick!
A magician makes potions by combining maple syrup from a magical maple tree with ordinary water. The magician starts with a large supply of two potions: a red potion, which is 50% magical syrup by volume
read more ..
Guest
Jan 24, 2023
0
134
3
+656
The equation describes the height y (in feet) at time t (in seconds) of a ball tossed up in the air at 28 feet per second from a height of
The equation describes the height y (in feet) at time t (in seconds) of a ball tossed up in the air at 28 feet per second from a height of 144 feet from the ground. In how many seconds will the ball hit the ground?
●
●
●
Keihaku
Jan 24, 2023
0
116
2
Counting
Help with these hard counting
Let n be a positive integer. Let k be a positive integer.
read more ..
●
●
Guest
Jan 24, 2023
0
78
0
Complex numbers
help need help with this
Describe all solutions to zw - 3w - 2iw + 4z = 7iw + 5w + 11iz - 13 + 15i
where z and w are complex numbers.
Guest
Jan 24, 2023
0
123
1
Counting
Help I need this
There is a group of five children, where two of the children are twins. How many ways can I distribute 10 identical pieces of candy to the children, if the twins must get an equal amount of candy?
read more ..
●
Guest
Jan 24, 2023
0
76
0
Math
8y-2(y+4) simplify
Guest
Jan 24, 2023
+1
120
1
+19
HELP ME PLZ
Sewing patterns recommend buying extra fabric in case of mistakes. Jessica bought 5 yards of fabric, plus 20% extra fabric.
Derek bought 3 yards of fabric, plus 25% extra. Who bought more fabric? How much more?
●
LIzzie6348
Jan 24, 2023
0
87
0
Sequences
Need lots of help on this
Cai writes down the list of positive integers, excluding squares and cubes and all perfect powers. His sequence starts
2, 3, 5, 6, 7, 10, 11, ...
What is the 100th term in Cai's list?
read more ..
Guest
Jan 24, 2023
0
86
0
Counting
I need help
Find the number of positive integers that satisfy the following conditions:
* Each digit is a 1 or a 2 or a 3
read more ..
Guest
Jan 24, 2023
0
85
0
Binomial Theorem
Help I need to use the binomial theorem somehow
(a) Simplify (n/k)/(n/(k - 1))
read more ..
Guest
Jan 24, 2023
0
75
0
Counting
How to solve this
Find the number of ways of placing 4 balls in 6 boxes if the balls are indistinguishable and the boxes are indistinguishable.
Guest
Jan 24, 2023
0
84
0
Probability
Help this hard
We define a bow-tie quadrilateral as a quadrilateral where two sides cross each other. An example of a bow-tie quadrilatera is shown below. distinct points are chosen on a circle. We draw all
read more ..
Guest
Jan 24, 2023
0
83
0
30% of 45
what is 30%of 45
Guest
Jan 24, 2023
0
130
1
what is the value of i^i
i^i=
●
Guest
Jan 24, 2023
0
96
0
HELP
You purchase x items for $4 each. Explain how the variable in the expression 4x and the variable in the equation 4x=20 are similar. Explain how they are different.
Guest
Jan 24, 2023
0
97
0
Algebra
Help me I have tried everything
Let a and b be real numbers such that a^3 + 3ab^2 = 679 and a^3 - 3ab^2 = 673. Find a - b.
Guest
Jan 24, 2023
«
latest
9232
9231
..
8718
8717
8716
8715
8714
..
2
1
»
Post New Question
2 Online Users
Top Users
+128570
CPhill
moderator
+118608
Melody
moderator
+33616
Alan
moderator
+14923
asinus
moderator
+9575
MaxWong
+3144
admin
administrator
+2440
GingerAle
+1791
tomtom
+1679
wiseowl
+1588
bader
+1133
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.