1. Hallar un número de dos cifras sabiendo que la suma de las cifras es 12 y que la primera de ellas es el triple de la segunda. 2. Alberto y su padre se llevan 25 años de edad. Calcular la edad de Alberto sabiendo que dentro de 15 años la edad de su padre será el doble que la suya.

3. Se tiene un rectángulo cuya altura mide 2cm más que su base y cuyo perímetro es igual a 24cm. Calcular las dimensiones del rectángulo.

AYUDA PORFAVOR¡¡¡

Titus works at a hotel. part of his job is to keep the complimentary pitcher of water at least half full and always with ice. when he starts his shift, the water level shows 4 gallons, or 128 cups of water. as the shift progresses, he records the level of the water every 10 minutes. after 2 hours, he uses a regression calculator to compute an equation for the decrease in water. his equation is w –0.414t + 129.549, where t is the number of minutes and w is the level of water. according to the equation, after about how many minutes would the water level be less than or equal to 64 cups?