Answer:

Step-by-step explanation:
You factor out the common term first.
You should get the equation below.

then you get rid of the negative inside
and will be simplified to this.

Answer:
d= +3
Step-by-step explanation:
1st term = -19
2nd term = -16
d = 2nd - 1st
d= -16-(-19)
d = +3
297 cm is the total surface area of the square pyramid
It should be |-80+15|=65 units because absolute value makes it positive.