1.A ladder is leaning against a building. The distance from the bottom of the ladder to the building is 18ft less than the length of the ladder. How high up the side of the building is the top of the ladder if that distance is 1ft less than the length of theladder?
The ladder reaches.................. feet up the wall.
2. If an object is propelled upward from a height of s feet at an initial velocity of v feet per second, then its height h after t seconds is given by the equation h=minus-16t squaredt2plus+vt tplus+s, where h is in feet. If the object is propelled from a height of 12 feet with an initial velocity of 64 feet per second, its height h is given by the equation h=minus-16t squaredt2plus+64tplus+12. After how many seconds is the height 72 feet?
(Use a comma to separate answers. Type either fractions or mixed numbers.)