Answer: idk the first equation
Step-by-step explanation:
Answer:
Pythagorean theorem 
Step-by-step explanation:

Greater than 5.4 i hate the 20 characters rule
Answer:
£30
Step-by-step explanation:
100% - 25% =75%
75% of £40
=£30
Answer:
-16-72v
Step-by-step explanation:
-8*2 = -16
-8*9v = -72v
so, -16 + (-72v) -> -16-72v