m ∠1 = 90° - m ∠2 1. m∠1 + m∠2 = m∠RST Substitution 2. ∠RST is a right angle. Definition of perpendicular lines 3. m∠1 = 90° - m∠2 Definition of right angle 4. m∠RST = 90° Angle addition theorem 5. Ray ST is perpendicular to Ray SR. Subtraction property of equality 6. m∠1 + m∠2 = 90° Given

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?

Given lm, find the measure of (award brainliest)

The bottom of ignacio's desktop is 74.5cm from the floor. ignacio's sits in his adjustable chair, and the tops of his legs are 49.3cm from the floor. each clockwise rotation of the knob on the chair raises ignacio's legs by 4.8cm. write an inequality to determine the number of clockwise rotations, r, ignacio could make with the knob without his legs touching the desk