Mammals account for about 1/10

of all vertebrates. Birds account for about 1/6,
Of all vertebrates. Together, what faction of vertebrates is made up of mammals and birds?

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?