Sarah is riding a hot-air balloon over a lake. From an altitude of 4000 feet, she throws a rock straight down toward the water. When the rock leaves her hand, its velocity is 30 feet per second. How long will it take the rock to hit the water?

Two streets intersect at a 30- degree angle. at the intersection, the are four crosswalks formed that are the same length. what type of quadrilateral is formed by the crosswalks?

Me n o w. i need t h i s. 10 points

Amanda went into the grocery business starting with five stores. after one year, she opened two more stores. after two years, she opened two more stores than the previous year. if amanda expands her grocery business following the same pattern, which of the following graphs represents the number of stores she will own over time?