Is the sum of a multiple of 3 and a multiple of 3 closed under addition ?

for your time ^^

Solve the word problem. the table shows the low outside temperatures for monday, tuesday, and wednesday. by how many degrees did the low temperature increase from monday to tuesday? this function table shows the outside temperature for a given a. 21.1⁰ b. 8.6⁰ c. 4.9⁰ d. 3.9⁰(the picture is the graph the the question is talking about.)

Aboat costs 19200 and decreases in value by 12% per year. how much will it cost in 5 years

In a class, there are 12 girls. if the ratio of boys to girls is 5: 4 how many boys are there in the class