book Maths Puzzle Numerical Ability

What is the sequence here? 4,9,19,39,79. Find the next term.

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book Other Question

hi i'm having trouble with these questions...actually with this whole subject in general

Identify the vertex of the parabola:

y^2 + 4y - x = 6

Find the center of the elli
log7 + log (n - 2) = log 6n

log516 - log52t = log52

log5m = log5125

logy = log16 + log49

log6(b2 + 2) + log62 = 2


logy = log16 + log49