book Maths Puzzle Numerical Ability

on chapter 8 page 709 of the prentice hall mathematics Algebra 1 what does
(2t)-6 mean

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book Other Question

Write the equation of the ellipse:

sum of focal radii is 20 and the y intercepts are 7 and -7. The center is (0,0).
Question goes like this....

Solve Equation.

2log2 (x+6) - log2 16 = 2