Which equation can be used to find 42 x 51? (4 x 5) + (2x1) = 20 + 2
(4 x 5) +(4 x 1) + (2 X 5) + (2x1) = 20 +4 +10 + 2
(40 x 50) + (40 x 1) + (2 X 50) + (2 X 1) = 2,000 + 40 + 100 + 2
(40 x 50) + 2x1) = 2,000 + 2
Done-

1. during first 10 seconds 2. between 10 seconds and 35 seconds 3. during 35 seconds to 40 seconds

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?

Another type of subtraction equation is 16-b=7. explain how you would sole this equation then solve it.