sec2.15

15. In the figure above, \[\Delta PQR\] is equilateral and \[SR\] and \[TV\] intersect at point \[P\]. What is the value of \[y\]?

16. Let the operations sec2.16(3) and sec2.16(2) be defined for all real numbers a and b as follows.
asec2.16(3)b = a + 3b
asec2.16(2)b = a + 4b
If 4sec2.16(3)(5y) = (5y)sec2.16(2)4, what is the value of \[y\]?

17. In the \[xy\]-coordinate plane, the graph of \[x = y^2 - 4\] intersects line \[\ell \] at \[(0,p)\] and \[(5,t)\] . What is the greatest possible value uof the slope of \[\ell\]?
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