How do you write 7.68 x 10^3 In standard form

Anumber cube is rolled two times in a row. find the probability it will land on 2 on the first roll and a number greater then 4 on the second roll

Awater truck is filling a swimming pool. the equation that represents this relationship is y=19.75x where y is the number of gallons of water in the pool and x is the number of minutes the truck has been filling the pool.

If a flying disk is 139 meters in the air and travels at an average of 13 m/s how long is it in the air