A possible answer is

.
Pi is an irrational number and when you multiply a rational number with an irrational number, you end up with an irrational number.
Answer:
I'm assuming that it is a right angle triangle.
Step-by-step explanation:
0.3x0.5=0.15
0.15/2=0.075
missing length is 0.075
Answer:
What am I suppose to do?
Step-by-step explanation:
Answer:
x=25
Step-by-step explanation:
The total angles of a triangle is 180°
So 180=36+61+(4x-17)
83=(4x-17)
100=4x
x=25
24) 9/19
27 is a bit tricky for me.. sorry ):
30) On the 7th it will be 1/120
33) C