5. find the value of x. any is appreciated. ^-^

The right answer for the question that is being asked and shown above is that:

This can be answered using the Pythagorean Theorem.
h2 = a2 + b2
h = square root (10^2 + 7^2)
h = square root (100 + 49)
h = square root (149) cm

So the correct answer is h = square root (149) cm

These are the multiples of 15 but what you are probably asking or what are the factors of 15