| 1981 |
AMC 12 1980 A Q5 |
If \(AB\) and \(CD\) are perpendicular diameters o... |
1500.00 |
| 1982 |
AMC 12 1980 A Q7 |
Sides \(AB,BC,CD\) and \(DA\) of convex polygon \(... |
1500.00 |
| 1983 |
AMC 12 1980 A Q9 |
A man walks \(x\) miles due west, turns \(150^\cir... |
1500.00 |
| 1984 |
AMC 12 1980 A Q11 |
If the sum of the first 10 terms and the sum of th... |
1500.00 |
| 1985 |
AMC 12 1980 A Q12 |
The equations of \(L_1\) and \(L_2\) are \(y=mx\) ... |
1500.00 |
| 1986 |
AMC 12 1980 A Q13 |
A bug (of negligible size) starts at the origin on... |
1500.00 |
| 1987 |
AMC 12 1980 A Q14 |
If the function \(f\) is defined by
\[ f(x)=\frac... |
1500.00 |
| 1988 |
AMC 12 1980 A Q15 |
A store prices an item in dollars and cents so tha... |
1500.00 |
| 1989 |
AMC 12 1980 A Q16 |
Four of the eight vertices of a cube are the verti... |
1500.00 |
| 1990 |
AMC 12 1980 A Q17 |
Given that \(i^2=-1\), for how many integers \(n\)... |
1500.00 |
| 1991 |
AMC 12 1980 A Q18 |
If \(b>1\), \(\sin x>0\), \(\cos x>0\), and \(\log... |
1500.00 |
| 1992 |
AMC 12 1980 A Q20 |
A box contains 2 pennies, 4 nickels, and 6 dimes. ... |
1500.00 |
| 1993 |
AMC 12 1980 A Q21 |
In triangle \(ABC\), \(\measuredangle CBA=72^\circ... |
1500.00 |
| 1994 |
AMC 12 1980 A Q23 |
Line segments drawn from the vertex opposite the h... |
1500.00 |
| 1995 |
AMC 12 1980 A Q25 |
In the non-decreasing sequence of odd integers \(\... |
1500.00 |
| 1996 |
AMC 12 1980 A Q26 |
Four balls of radius 1 are mutually tangent, three... |
1500.00 |
| 1997 |
AMC 12 1980 A Q28 |
The polynomial \(x^{2n}+1+(x+1)^{2n}\) is not divi... |
1500.00 |
| 1998 |
AMC 12 1980 A Q30 |
A six digit number (base 10) is squarish if it sat... |
1500.00 |
| 1999 |
AMC 12 1981 A Q2 |
Point \(E\) is on side \(AB\) of square \(ABCD\). ... |
1500.00 |
| 2000 |
AMC 12 1981 A Q4 |
If three times the larger of two numbers is four t... |
1500.00 |