4y - 1 when y = 5
please give a detailed explanation!

The perimeter of a movie screen is 54 meters. the screen is 18 meters wide. how tall is it?

What are the equivalent ratios for 24/2= /3= /5.5=108/ = /15

The u-drive rent-a-truck company plans to spend $13 million on 320 new vehicles. each commercial van will cost $25 comma 000, each small truck $50 comma 000, and each large truck  $80 comma 000. past experience shows that they need twice as many vans as small trucks. how many of each type of vehicle can they buy?