The number of floors tiles depends on the area of the wall to be covered . if 190 tiles cover 100 square feet , how many tiles will john need to cover a 3 feet by 38 feet hallway? what is the rate of change?

John needs 217 tiles.

Rate of change is 1.9 tiles per square foot

Step-by-step explanation:

Hallway area=3•38=114 ft²

Rate of change=190/100=1.9 tiles/ft²

Tile total=

T=area•rate

=114•1.9

T=216.6

(Round up because tiles are sold as whole units)

Total tiles=217

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