1.what is the value of x? ( 1st pic)
2. what is the value of x? ( 2nd pic)
3. what is the value of x? ( 3rd pic)

For the first picture using Pythagorean Theorem, we know that a^2 + b ^2 = c^2 but since we only know c ( 99.2) and b ( 62 ) we need to use the theorem to find a the equation we use for that is : 
A = square root of ( c^2 - B^2 ) 
A = 77.44

Where are the functions?

The first digit is in the middle school 100s place