10 books because the ratio is 2:5 and you have 4:x so x=10 ((:
47/5=9.40
9*5=45
47/5= 9 2/5
Answer:
y
=
x
+
8
Step-by-step explanation:
The answer is 1;3 because if you simplified 2;6 you get 1;3 so the answer to that is
a: 1;3
Answer:
First term (a) =8
Common difference (d)= t2-t1
=12-8
=4
Now, sum of first 31th term (tn31) =n/2{2a+(n-1)d}
= 31/2{2×8+(31-1)4}
=31/2{16+(30×4)
=31/2(16+120)
=31/2×126
=31×63
Step-by-step explanation:
Similarly use 19 as (n) for the 19th term
