How are these two problem different 35-15 and 43-26

Why can we combine like terms?

a store clerk has 45 shirts to pack in boxes each boxes hold 6 shirts what is the fewest boxes of clerk will need to pack all the shirts

Last year, Americans paid $2.00 per gallon of gas. This year, the price is $2.40 per gallon. What is the percent of change in the price of gas?

Niko is looking at two different options for a new cell phone plan. Plan A has a fee of $40 plus an additional fee of $0.04 per minute. With this plan, the first 500 minutes are free. Plan B has a fee of $60 plus an additional fee of $0.

There is a total of 150 coins in two boxes. Seventeen coins are then shifted from the first box to the second, resulting in the second box having twice as many coins as the first. Solve using an algebraic equation.

Henry rented a truck for one day. There was a base fee of $17.95, and there was an additional charge of 71 cents for each mile driven. Henry had to pay $144.33 when he returned the truck. For how many miles did he drive the truck?

Willow is starting a big business for her class. A bake sale! Rachel, Lana, Sara, and Josephine are also participating! Rachel needs 1/2 more cups of yeast to make the challah. Lana needs 1 1/2 cups more flour to make the fortune cookies.

Determine which answer is reasonable to 4.8 times 9.2 A. 14 B. 45.36 C. 432 D. 470.4

Tia was flying her model airplane. it took the airplane 5 seconds to go 90 feet. what was the average rate of speed of the model airplane, in feet per second?

Suppose the length of the prism is doubled how does the volume change explain your reasoning