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}
233554 Questions
0
1
1
+447
Algebra
At a cafeteria, Mary orders two pieces of toast and a bagel, which comes out to $3.15. Gary orders a bagel and a muffin, which comes out to $3.50. Larry orders a piece of toast, two bagels, and three muffins, which comes out to $8.15. How many cents does
read more ..
●
ChiIIBill
Jul 9, 2024
-1
2
2
+447
Algebra
I drove to the beach at a rate of 40 miles per hour. If I had driven at a rate of 50 miles per hour instead, then I would have arrived 45 minutes later. How many miles did I drive?
●
●
ChiIIBill
Jul 9, 2024
0
1
2
+713
Number Theory
How many lattice points (points with integer coordinates) are on the line segment whose endpoints are $(3,17)$ and $(82,150)?$ (Include both endpoints in your count.)
●
●
Hi6942O
Jul 9, 2024
0
1
4
+713
Number Theory
Find the units digit of $13*287$.
●
●
●
●
Hi6942O
Jul 9, 2024
0
2
1
+713
Number Theory
Find the last three digits of $35*{781}$.
●
Hi6942O
Jul 9, 2024
0
2
1
+713
Number Theory
Select all the integers that are congruent to $2$ modulo $7.$
1, 2, 3, 4, 5, 6, 7
●
Hi6942O
Jul 9, 2024
0
2
1
+713
Number Theory
How many of the $1000$ smallest positive integers are congruent to $5$ modulo $171?$
●
Hi6942O
Jul 9, 2024
0
2
0
+764
Number Theory
(This is a continuation of the problem above. See part (a) for an explanation of the planet Enigma and its currency.)
In how many ways can a resident of Enigma use only bills to purchase a single math book page that costs 5 confusions?
read more ..
Rangcr897
Jul 9, 2024
0
3
0
+764
Number Theory
(This is a continuation of the problem above. See part (a) for an explanation of the planet Enigma and its currency.)
In how many ways can a resident of Enigma use only bills to purchase a gyroscope that costs $30$ confusions?
<
read more ..
Rangcr897
Jul 9, 2024
0
2
1
+764
Number Theory
On planet Enigma, the residents use a currency called the confusion. There are only two confusion bills on Enigma, one worth $7$ confusions and the other worth $12$ confusions. There are also some coins of smaller value, but each weighs over
read more ..
●
Rangcr897
Jul 9, 2024
0
1
1
+1420
Algebra
Find the largest value of $x$ such that $3x^2 + 17x + 15 = 2x^2 + 21x + 12 - 5x^2 + 17x + 34.$
●
ABJeIIy
Jul 9, 2024
0
2
1
+1420
Algebra
Fill in the blanks to make a quadratic whose roots are $1$ and $-1.$
x^2 + ___ x + ___
●
ABJeIIy
Jul 9, 2024
0
3
0
+1420
Algebra
Write the equation of the line below in the form Ax+By=C, where A, B, and C are integers with greatest common divisor 1 and A is positive.
The line passes through (-2,5) and (9,1).
ABJeIIy
Jul 9, 2024
0
2
1
+1420
Algebra
The system of equations
\frac{xy}{x + y} = 1, \quad \frac{xz}{x + z} = 1, \quad \frac{yz}{y + z} = 2
has exactly one solution. What is $z$ in this solution?
●
ABJeIIy
Jul 9, 2024
0
2
3
+9
Algebra
Fully simplify
●
●
●
DeluluSunshine
Jul 9, 2024
0
3
2
+1420
Algebra
In a store window, there was a box of berries having a total weight of 200 kg. The berries were 99% water, by weight. After two days in the sun, the water content of the berries was only 90%, by weight. What was the total weight of
read more ..
●
●
ABJeIIy
Jul 9, 2024
0
3
0
+1420
Algebra
A mathematician works for t hours per day and solves p problems per hour, where and are positive integers. One day, the mathematician drinks some coffee and discovers that he can now solve 4p+5 problems per hour. In fact, he only works
read more ..
ABJeIIy
Jul 9, 2024
0
2
0
+585
Geometry
In trapezoid EFGH, \overline{EF} \parallel \overline{GH}, and P is the point on \overline{EH} such that EP:PH = 1:2. If the area of triangle PEF is 6, and the area of triangle PGH is 6, then find the area of trapezoid EFGH.
magenta
Jul 9, 2024
Jul 8, 2024
0
3
1
+585
Geometry
Altitudes AD and BE of acute triangle ABC intersect at point H. If angle ABH = 30 and angle DAC = 45, then what is angle HCA in degrees?
●
magenta
Jul 8, 2024
0
2
2
+4
I need help please
Find the value of that maximizes
●
●
theguest
Jul 8, 2024
0
2
2
+36
algebra??
For a certain value of , the system
has no solutions. What is this value of ?
●
●
onyulee
Jul 8, 2024
0
2
1
+1234
Algebra
The function f(x) is defined for 1 \le x \le 5 as follows:
f(x) = 2x + 8 if 1 \le x \le 2
f(x) = 13 - 5x if 2 < x \le 3
f(x) = 20 - 14x if 3 < x \le 4
read more ..
●
blackpanther
Jul 8, 2024
0
3
0
+1234
Algebra
Let
f(x) = \left\lfloor\frac{2 - 3x}{3x + 1}\right\rfloor.
Evaluate f(1)+f(2) + f(3) + \dots + f(999)+f(1000). (This sum has 1000 terms, one for the result when we input each integer from 1 to 1000 into f.)
blackpanther
Jul 8, 2024
«
latest
9341
9340
..
9327
9326
9325
9324
9323
..
2
1
»
Post New Question
3 Online Users
Top Users
+129739
CPhill
moderator
+118626
Melody
moderator
+36935
ElectricPavlov
+33617
Alan
moderator
+14966
asinus
moderator
+11912
rosala
+3146
admin
administrator
+2487
GingerAle
+1981
LiIIiam0216
+1859
tomtom
+1714
bader
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.