One quarter of a number is 30.find the number

Find the multiplicative inverse of 8-12i

Sanya noticed that the temperature was falling at a steady rate of 1.4 degrees every hour from the time that she first checked her outdoor thermometer. by 6 a. m., the temperature had fallen 21 degrees. which expression can you use to find how many hours earlier she had first checked the thermometer?

Qrst is a parallelogram. determine the measure of ∠q pls