Yes his equations are correct
Answer:
A) 147.6 sq m
Step-by-step explanation:
Separate the pyramided out into 4 triangles and add those
3 of them (sides) will be the same

This is one half of the side, multiply by 2 to get the area of the entire side, 40 square m.
The area of all 3 sides together is 40*3 = 120 sq m
For your base, your height will be 6.9 and your base is 4
A = 13.8 sq m
multiply by 2 again for the entire base
A=27.6 sq m
Now add both
120 + 27.6
Answer:
2,000,000 + 36,000 + 17
Step-by-step explanation:
If 2x +y =15 and x+2y =-3 then 2x +2y = 7.5 , I am not sure if its 7.5
Answer: x10^-9
Step-by-step explanation: