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
BRAlNBOLT
Username
BRAlNBOLT
Score
161
Membership
Stats
Questions
161
Answers
13
161 Questions
13 Answers
0
1
0
+161
Algebra
Suppose $f(x)$ is a function defined for all real $x$, and suppose $f$ is invertible (that is, $f^{-1}(x)$ exists for all $x$ in the range of $f$). If the graphs of $y=f(x)$ and $y=f(1/x)$ are drawn, at how many points do they intersect?
BRAlNBOLT
9 hours ago
-1
1
1
+161
Geometry
Let $WXYZ$ be a trapezoid with bases $\overline{XY}$ and $\overline{WZ}$. In this trapezoid, $\angle ZXW = 120^\circ$, $\angle XWZ = 60^\circ$, and $\angle XYZ = 120^\circ$. Find $\angle YXZ$, in degrees.
●
BRAlNBOLT
Aug 31, 2024
0
1
1
+161
Coefficient
What's the coefficient of the x^2 y^4 term in the expansion of (x + y)*6*(3x - 2y)*(5x + y)^4?
●
BRAlNBOLT
Aug 10, 2024
0
1
1
+161
Coefficient
What's the coefficient of xy in the expansion of (3x + 3y + 3)^3?
●
BRAlNBOLT
Aug 10, 2024
-1
3
0
+161
Algebra
Let $f(x) = px + q$, where $p$ and $q$ are real numbers. Find $p+q$ if $f(f(f(x))) = 64x - 105 - 30x + 70 + 32x - 12$.
BRAlNBOLT
Aug 10, 2024
-1
4
1
+161
Counting
We call a number cozy if every digit in the number is either even or next to an even digit. For example, a number is cozy if every digit in the number is either a 2 or next to a 2. For example, the number 222, 72, 45, and 810 and
read more ..
●
BRAlNBOLT
Aug 8, 2024
-1
2
0
+161
Number Theory
Let $N$ be a positive integer. The number $N$ has three digits when expressed in base $7$. When the number $N$ is expressed in base $12$, it has the same three digits, in reverse order. What is $N$? (Express your answer in decim
read more ..
BRAlNBOLT
Jul 19, 2024
-1
2
1
+161
Number Theory
A positive integer is called terrific if it has exactly $10$ positive divisors. What is the smallest terrific positive integer?
●
BRAlNBOLT
Jul 19, 2024
-1
3
1
+161
Algebra
Find the minimum value of \frac{x^2}{x - 1 + x^3} for x > 1
●
BRAlNBOLT
Jul 18, 2024
-1
4
1
+161
Algebra
Find all values of t such that floor(t) = 3t + 4 - t^2. If you find more than one value, then list the values you find in increasing order, separated by commas.
●
BRAlNBOLT
Jul 18, 2024
-1
2
1
+161
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.)
●
BRAlNBOLT
Jul 18, 2024
«
latest
15
14
..
2
1
»
«
latest
0
-1
2
latest
»