An attic floor is shaped like a triangle with a height of n yd and a base of 6 yd. which expression represents the area of the floor?
1. n + 6
2. 3n
3. 3n2
4. 6n

we know that

the area of a triangle is equal to

in this problem we have

to find the area of the floor , calculate the area of the triangle

substitute the values in the formula

therefore

the answer is the option

2. 3n

i'm assuming that it's c.)   volcanoes built the mountains and earthquakes tore them down.