100-300 USD or so
it is -15.4 they're both negative numbers (-7.7 and -7.7, when you look at them separately) and you just add them up, but keeping the - sign in front of the sum, because: -7.7 - 7.7 = - (+7.7 + 7.7)...
A normal esr reading is 1 to 12. A result of 77 means there is inflammation in the body.
50-260 or so
75-200 USD or so