Answer:
p=5
Step-by-step explanation:
if 5+3 = 8
13-8=5
and both sides of the triangle need to be the same
Answer:

Step-by-step explanation:
Given

See attachment
Required
Find AB
We have:

Make c the subject


From the attached triangle;

Hence:

Step-by-step explanation:
=>a+6a=90-12
=>7a=78
=>a=11,14
Answer: 3rd one
Step-by-step explanation:
Answer:
2x
Step-by-step explanation:
x2+7x=9
x+x+2+7=9
2x+9=9
=2