Please help me. When placed in the box, which exponent makes the statement true?

If the wwight of a package is multiplied by 7/10 the result is 65.8 find the weight of the package

Two cyclists 84 miles apart start riding toward each other at the samen time. one cycles 2 times as fast as the other. if they meet 4 hours later what is the speed (in miles) of the faster cyclists

Y=21.95x+10 y=22.45x solve by substitution