exam Maths Puzzle Numerical Ability

Television sets: What does it mean to refer to a 20-in TV set or a 25-in TV set? A 15-in TV set also has a width of 12-inches. What is its height?

I am stumped on how to set up the problem into an equation. Can someone help me?

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studing for my finals....need help!!!

write as a single logarithm:

2 log 2 - 3 log x - 1/2 [log(x+3) + log (x-2)]

THIS IS THE HARDEST ONE YET!!!!PLEASE HELP......AND THANK Help is needed. Thanks!
Evaluate the functions for the values of x given as 1, 2, and 8. Describe the differences in the rate at which each function changes with increasing value