(x+y+z) (x-y+z)

Thank you

x^2  +2xy + 2xz - y^2 + z^2

Step-by-step explanation:

(x+y+z) (x-y+z)

x^2 + xy + xz + xy - y^2 + yz + xz - yz + z^2

x^2 + xy + xy + xz + xz - y^2 + yz - yz + z^2

x^2  +2xy + 2xz - y^2 + z^2

1) c 2143.6 cm

2) c 113.0 m

3) a 33.5 ft

4)   d 2 cm

5) c 20 mm

6) 180 in

7) d 120 ft

unless if u could do my questions, if not i wouldn't want to