X-85=156 what is x equal to? or supposed to be. whichever. what is x? pls help me:))

Olivia uses the work below to determine 55% of 720 which explains the error in olivia’s solution

What are the measures of ∠a, ∠b, ∠c and ∠d? explain how to find each of the angle measure.

The magnitude, m, of an earthquake is defined to be m=log l/s, where i is the intensity of the earthquake (measured by the amplitude of the seismograph wave) and s is the intensity of a “standard” earthquake, which is barely detectable. what is the magnitude of an earthquake that is 1,000 times more intense than a standard earthquake? use a calculator. round your answer to the nearest tenth.