7. The area of the playing surface at the Olympic Stadium in Beijing is of 3/5a hectare. What area will it occupy on a plan drawn to a scale of 1:500?

answer4 to the second power is 16

and 4 to the third power is 64,

the correct option is b

step-by-step explanation:

1,407.5 hours

step-by-step explanation:

we first convert all the time to hours and then sum them up.

there are 24 hours in 1 day, in 58 days, there are 24 x 58 = 1,392 hours.

there are 60 minutes in 1 hour, thus, 30 minutes will be equivalent to 30 / 60 = 0.5 hours.

therefore, the number of hours it will take mercury to complete a full rotation is 1,392 + 15 + 0.5 = 1,407.5 hours