What number is needed to complete the pattern 5 10 3 15 20 13 25 30?

23 is the answer.

Step-by-step explanation:

5+5 =10

10-7 =3

3+12=15

15+5 =20

20-7=13

13+12=25

25+5=30

30-7= 23  is the answer,

Rule is

Step 1 : Add 5

Step2 : Subtract 7

Step3: Add 12

And repeat it to get the series .

∠acb = 8°

step-by-step explanation:

∠xba lies on the circle and is half the measure of the intercepted arc ax

hence

measure of arc ax = 2 × 42° = 84°

∠acb is outside the circle and is

∠acb = (arcab - arcax ), hence

∠acb = 0.5 (100 - 84) = 0.5 × 16° = 8°

true? is that what you're asking or do you mean something else?