In a building, 12 LED box of 20 watt each and 8 fans of 150 watt each are used for 6 hours daily. Similarly, 2 heaters of 1500 watt each are used for 2 hours daily. If the rate of consumption of electricity is Rs. 7.5 per unit, calculate the total bill of electricity consumption of one month.​

May someone explain how to do this question?

What’s #16 asking me and how do i solve it?

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?