Jack and jim went biking.

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?

Why do you think electric energy for households is generally supplied by power plants instead of by an electric generator at home.

Why do you need to classify the size of a particle