Help me plz ASPA which Local Groups are expanding more (or faster) the ones which are CLOSE together or the ones that are FAR apart? (Answer in a complete Sentence).​

What is the magnification of a real image if the image is 10.0 cm from a mirror and the object is 50.0 cm from the mirror ? use the equation m=-di/do. a. -5.0 b. 5.0 c. 0.20 d. -0.20

What is tan(61)? а. 1.80 b. 0.49 c. 0.61 d. 0.87

An important dimensionless parameter concerned with very high-speed flow is the mach number, defined as v/c, where v is the speed of the object such as an airplane or projectile, and c is the speed of sound in the fluid surrounding the object. for a projectile traveling at 1170 mph through air at 50 ˚f and standard atmospheric pressure, what is the value of the mach number?