What is the value of x? Four fifths x - 1 Over 10 = 3 Over 10

Consider the diagram. which line segment has the same measure as st? rx tx sr xs

Two cyclists 84 miles apart start riding toward each other at the same. one cycles 2 times as fast as the other. if they meet 4 hours later, what is the speed (in mi/h) of the faster cyclist?

Asquare and an equilateral triangle have the same perimeter. each side the triangle is 4 inches longer than each side of the square. what is the perimeter of the square