11. Similar 1/2
12. Similar 2
13. no
14. no
15. No, they are not congruent because rectangles do not have equal sides, so the length of one triangle could be longer than the other and the width ozone can be shorter than the other.
16. Yes
7:45 -1 hour=6:45
The concert started at 6:45
7:45+2 hours=9:45
The concert will be over at 9:45
The time outside the theater is
5:30a.m. or 5:30p.m.
It's most likely 5:30p.m. as 5:30a.m. is really early in the morning.
Answer:






Step-by-step explanation:
Solving (i):

Open brackets

Collect like terms


Solving (ii)

Open bracket

Collect like terms


Solving (iii)

Open bracket

Collect like terms


Solving (iv)

Open bracket

Collect like terms


Solving (v):

Open bracket

Collect like terms


Solving (vi)

Open brackets

Collect like terms

7+(10−4)2:4⋅231=7+62:4⋅81=7+36:4⋅81=7+9⋅81=7+89=7+181=881
Answer:
15-3r
Step-by-step explanation:
A expression cannot have a equal sign only = + or -
If you have questions feel free to ask me! :)