| 1981 |
AMC 12 1980 A Q23 |
Line segments drawn from the vertex opposite the h... |
1500.00 |
| 1982 |
AMC 12 1980 A Q25 |
In the non-decreasing sequence of odd integers \(\... |
1500.00 |
| 1983 |
AMC 12 1980 A Q26 |
Four balls of radius 1 are mutually tangent, three... |
1500.00 |
| 1984 |
AMC 12 1980 A Q28 |
The polynomial \(x^{2n}+1+(x+1)^{2n}\) is not divi... |
1500.00 |
| 1985 |
AMC 12 1980 A Q30 |
A six digit number (base 10) is squarish if it sat... |
1500.00 |
| 1986 |
AMC 12 1981 A Q4 |
If three times the larger of two numbers is four t... |
1500.00 |
| 1987 |
AMC 12 1981 A Q5 |
In trapezoid \(ABCD\), sides \(AB\) and \(CD\) are... |
1500.00 |
| 1988 |
AMC 12 1981 A Q7 |
How many of the first one hundred positive integer... |
1500.00 |
| 1989 |
AMC 12 1981 A Q9 |
In the adjoining figure, \(PQ\) is a diagonal of t... |
1500.00 |
| 1990 |
AMC 12 1981 A Q11 |
The three sides of a right triangle have integral ... |
1500.00 |
| 1991 |
AMC 12 1981 A Q13 |
Suppose that at the end of any year, a unit of mon... |
1500.00 |
| 1992 |
AMC 12 1981 A Q14 |
In a geometric sequence of real numbers, the sum o... |
1500.00 |
| 1993 |
AMC 12 1981 A Q15 |
If \(b>1\), \(x>0\) and \((2x)^{\log_b 2}-(3x)^{\l... |
1500.00 |
| 1994 |
AMC 12 1981 A Q16 |
The base three representation of \(x\) is \[ 12112... |
1500.00 |
| 1995 |
AMC 12 1981 A Q17 |
The function \(f\) is not defined for \(x=0\), but... |
1500.00 |
| 1996 |
AMC 12 1981 A Q18 |
The number of real solutions to the equation \[ \f... |
1500.00 |
| 1997 |
AMC 12 1981 A Q19 |
In \(\triangle ABC\), \(M\) is the midpoint of sid... |
1500.00 |
| 1998 |
AMC 12 1981 A Q20 |
A ray of light originates from point \(A\) and and... |
1500.00 |
| 1999 |
AMC 12 1981 A Q22 |
How many lines in a three dimensional rectangular ... |
1500.00 |
| 2000 |
AMC 12 1981 A Q25 |
[asy]defaultpen(linewidth(.8pt));
pair A = (0,11)... |
1500.00 |