Find the sum of 60.09 and 82.4. How do you know where to place the decimal in the answer

Which expression is equivalent to (9x - 3 1/ + 1 3/8)

Two fire-lookout stations are 190 miles apart, with station a directly south of station b. both stations spot a fire. the bearing of the fire from station a is upper n 55 degrees upper e and the bearing of the fire from station b is upper s 60 degrees e. how far, to the nearest tenth of a mile, is the fire from each lookout station?

What is the missing constant term in the perfect square that starts with x^2 -20x