Using the net, we see that the square pyramid breaks down to 4 equivalent triangles and a square. We can use this formula to solve for the surface area:
Sa=A(square)+4*A(triangle)
The formula for the area of a square is
A=l*w
A=7*7
A=49mm²
The formula for the area of a triangle is:
A=1/2b*h
A=1/2*7*12.2
A=42.7mm²
Now that we have the individual areas of the shapes, we can solve for the surface area.
Sa=A(square)+4*A(triangle)
Sa=49mm²+4*42.7mm²
Sa=49mm²+170.8mm²
Sa=219.8mm²
Answer=219.8mm²
ANSWER=A
3x-6=9x
3x-9x=6
-6x=6
X=-1
6x+30=3x
6x-3x=-30
3x=-30
X=-10
1.add all of the votes together.
2. you should get 170
Comment : i see you are dividing 170 by 12. Yea , don't do that. convert 12 into a decimal. for that all you have to do is move the
decimal 2 times to the left. (always do that)
3. Now that you know that multiply 170 and 0.12.
4. you should get 20.4 students, but round it to 20 students
Answer: 20 students voted for Mrs.Alberto