Find the ratio a: b, if it is given that

5a−3b=7b

Can someone me with my hwplz(only the circled ones)

You have 6 dollars +12 pennies +to quarters + 4 dimes=2 nickels how much do you have

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