Which of the following is a difference between the marketing concept and the selling concept?

The distance d that a car can travel in a certain amount of time t can be found by multiplying the rate of speed r by the travel time. if a car has already travel 4 miles, the formula for the total distance travel is d= rt + 4. which of the following gives the value of r, in terms of d and t?

Which of the following always exist between two objects having mass ● elastic force ● contact force ●gravitational force ●magnetic force

What is the binomial name of the horsefly species that's golden backside inspired a 24-year old researcher to name it after a pop star in january 2012?