9 Find the percentage change from the first quantity to the second quantity:
From 60 km/h to 45 km/h.

%

Carson has only $20 bills and $10 bill in her wallet. the total value of the bills is $50. she has 1 more $20 bill than $10 bills. how many each kind of bill does carson have? a. one $20 and two $10 bills b. two $20 bills and one $10 bill c. one $20 bills and three $10 bills d. two $20 bills and two $10 bills

Can someone answer it, and plot it, for 20 points and brainliest answer? p.s. they're the same ! : )

Which shows the correct solution of the equation 1/2a+2/3b=50, when b=30?