A train moving at a speed of 60km/hour covers a distance in 7.5 hours . What should be the speed of the train to cover the same distance in 6 hrs .

You are making a battery for a science project. you have copper wire for your first electrode. you need to choose a conductor, a second electrode, and a device to plug into your battery. you have already chosen a lemon conductor. complete each statement below about the options that include a lemon conductor.

An 18% discount on a watch saved a shopper $72. find the price of the watch before the discount

Parabolas y=−2x^2 and y=2x^2+k intersect at points a and b that are in the third and the fourth quadrants respectively. find k if length of the segment ab is 5.