True/false an equation always has an equl sign​

Evaluate the given expression if m=45 |-3m|

An arc subtends a central angle measuring 7pi/4 radians what fraction of the circumference is this arc?

What is the volume of the cone to the nearest cubic millimeter? (use π  = 3.14) a) 46 mm3 b) 128 mm3 c) 183 mm3 d) 275 mm3 diameter = 5 mm height = 7 mm how do you do this problem step by step?