Fireworks are fired from the roof of a 100-foot building and travel 84 feet per second. The equation h= - 16t^2 + 84t + 100 models the height h of the fireworks at any given time t seconds. 1. how long are the fireworks in the air?
2. how high did the fireworks get?
3. how high were the fireworks 2 seconds after they left the roof?​

Multiplying an even number of negative numbers gives an answer that is choose from:

Jackie purchased 3 bottles of water and 2 cups of coffee for the family for $7.35. ryan bought 4 bottles of water and 1 cup of coffee for his family for 7.15. how much does each bottle of water cost? how much does each cup of coffee cost?

Question 1 of 10 2 points different groups of 50 graduates of an engineering school were asked the starting annual salary for their first engineering job after graduation, and the sampling variability was low. if the average salary of one of the groups was $65,000, which of these is least likely to be the average salary of another of the groups? o a. $64,000 o b. $65,000 o c. $67,000 o d. $54,000