exam Maths Puzzle Numerical Ability

a triangle that has a 5 inch side and a 6 inch side can be similar to a triangle that has a 4 inch side and an 8 inch side. find all possible examples. check that your examples are

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Hi I am working out of a book my mom got me from a book store to help me stay on top of things during the summer. I have having a problem with this problem

8(y+5)+ 8y = 24
What is the amplitude, period and phase shiftbof the following functions

1) y= - 3 sin 1/3x

2) y= cos 4(x-pi/3)

3) y= tan (3x - pi/2)

4) y= 5sin((pi)x-pi/2)