A tree is 12 feet tall and casts a shadow 9 feet long. A building nearby casts a shadow that measures 24 feet. How tall is the building? (Hint: Draw a picture and Set up a proportion)

The ratio between the tree and shadow is 12:9, which can be simplified to 4:3. as we now have a shadow of a building, we can use to ratio and scale it up to find how tall the building is.

4:3
?:24
how many times does 3 go into 24? it goes 8 times, so we multiple the 4 by 8 to get 32
32:24

A) for the n row: 22+(n-1)×6therefore,b) 100-22=78that means (n-1)×6=7878÷6=1313+1=1414th row has 100 seats