Answer:
The Pythagorean Theorem states that 
Step-by-step explanation:
This formula applies to the side lengths and means that the length of leg "a" squared, plus the length of leg "b" squared, will equal the length of hypotenuse "c" squared. Please state a more specific question so I can go into more detail if you need it :)
7+d=19 is the answer
subtract 7 from each side d=19-7
d=12
Step-by-step explanation:
commision = 7% of $9000
commision = 7/100 * $9000
commision = $630