Identify which numbers are written correctly in scientific notation and which are not

What is the value with a place of tenths in 907.456 1) 0 2) 6 3) 4 4) 5

Someone this asap for a group of students attends a basketball game. * the group buys x hot dogs at the concession stand for $2 each. * the group buys y drinks at the concession stand for $3 each. the group buys 29 items at the concession stand for a total of $70. how many hot dogs did the group buy?

The radius of a sphere is 3 inches. which represents the volume of the sphere?