= cos( -x ) * [ - sin( - x ) ] = cosx * sinx ;
cosx * sin x is the right answer !
D. 300 it is. is there more?
The area of the base (six triangles with a base 15m and a height 7.5√3m):
The area of side walls (six triangles with a base 15m and a height 12m)
The surface area:
We can use substitution or elimination
Let’s use substitution
Make slope intercept equation for the first equation
Y = -x + 5
Now plug in the y value for the second equation
-5x - 4(-x + 5) = -18
-5x + 4x - 20 = -18
-1x = 2, x = -2
There is one solution