| 1901 |
AMC 12 1990 A Q9 |
Each edge of a cube is colored either red or black... |
1500.00 |
| 1902 |
AMC 12 1990 A Q10 |
An \(11\times 11\times 11\) wooden cube is formed ... |
1500.00 |
| 1903 |
AMC 12 1990 A Q11 |
How man y positive integers less than \(50\) have ... |
1500.00 |
| 1904 |
AMC 12 1990 A Q12 |
Let \(f\) be the function defined by \(f(x)=ax^2-\... |
1500.00 |
| 1905 |
AMC 12 1990 A Q13 |
If the following instructions are carried out by a... |
1500.00 |
| 1906 |
AMC 12 1990 A Q15 |
Four whole numbers, when added three at a time, gi... |
1500.00 |
| 1907 |
AMC 12 1990 A Q16 |
At one of George Washington's parties, each man sh... |
1500.00 |
| 1908 |
AMC 12 1990 A Q17 |
How many of the numbers, \(100,101,\ldots,999\), h... |
1500.00 |
| 1909 |
AMC 12 1990 A Q18 |
First \(a\) is chosen at random from the set \(\{1... |
1500.00 |
| 1910 |
AMC 12 1990 A Q19 |
For how many integers \(N\) between \(1\) and \(19... |
1500.00 |
| 1911 |
AMC 12 1990 A Q20 |
\(ABCD\) is a quadrilateral with right angles at \... |
1500.00 |
| 1912 |
AMC 12 1990 A Q22 |
If the six solutions of \(x^6=-64\) are written in... |
1500.00 |
| 1913 |
AMC 12 1990 A Q23 |
If \(x,y>0\), \(\log_yx+\log_xy=\frac{10}{3}\) and... |
1500.00 |
| 1914 |
AMC 12 1990 A Q27 |
Which of these triples could not be the lengths of... |
1500.00 |
| 1915 |
AMC 12 1990 A Q28 |
A quadrilateral that has consecutive sides of leng... |
1500.00 |
| 1916 |
AMC 12 1990 A Q29 |
A subset of the integers \(1, 2, ..., 100\) has th... |
1500.00 |
| 1917 |
AMC 12 1990 A Q30 |
If \(R_n=\frac{1}{2}(a^n+b^n)\) where \(a=3+2\sqrt... |
1500.00 |
| 1918 |
AMC 12 1986 A Q1 |
\([x-(y-x)] - [(x-y) - x] =\)
$$\textbf{(A)}\ 2... |
1500.00 |
| 1919 |
AMC 12 1986 A Q2 |
If the line \(L\) in the \(xy\)-plane has half the... |
1500.00 |
| 1920 |
AMC 12 1986 A Q4 |
Let \(S\) be the statement
"If the sum of the d... |
1500.00 |