Let's analyze the increments for each step of the sequence:
Each step we add 3 to the previous number.
Since we need the 20th, from what we saw, in the 20th term we will have added three 20 times.
So the procedure is: calculate how much is 3 times 20 and then add that to the first term of the sequence.

So we add 60 to the first term to find the 20th term:

Answer: 124
Answer:
Did you get the answer fo r this one
Step-by-step explanation:
??
130 cm = 1,30 m
55 mm = 0,055 m
Sum = 1,355 m
Answer: The missing step is,
m∠OCP ≅ m∠ABC because corresponding angles made by the same transversal on the parallel lines are congruent.
Step-by-step explanation:
Given :
, 
And, 
We have to Prove : Angle PCQ is complementary to angle ABC
⇒ 
Proof: Since, 
⇒ 
But,
( By angle addition postulate )
⇒
( By transitive property of equality )
Since,
,
⇒
( corresponding angles made by the same transversal are congruent)
⇒
( By the definition of congruent angles )
This leads,
( by the transitive property of equality )
Thus, by the definition of complementary angles,
Angle PCQ is complementary to angle ABC
Hence proved.