zero
double - is actually plus
Answer:
463mi
Step-by-step explanation:
<span>49b^6 = 7b^5(7b)
</span><span>28b^5 = 7b^5(4)
so
</span><span>greatest common factors for 49b^6 and 28b^5 = 7b^5</span>
Increases by +2
Its arithmetic
Sixth number would be 17+2=19
Seventh is 19+2=21
Eighth is 21+2=23