What properties to find angles A B and C

Scale factor of 2 is used to enlarge a figure as shown below the area of is 18 in.²

Julie was able to walk 16 km through the zoo in 6 hours. how long will it take her to walk 24 km through the zoo?

Solve the system of equations using the substitution method. {y=−3x+7x=−2y−16 enter your answers in the boxes.