How do you calculate variables ex .) ab+cd=e

What is the greatest common factor of 6a, 8a^{2}, and 14?

Hannah is 3 years older than twice her brother joey’s age. joey is 2 years old. how old is hannah? show all of your work! the number of students is five more than seven times the number of teachers. there are 10 teachers. how many students are there? be sure to show all of your work!

On a piece of paper, graph y< x+1. then determine which answer matches the graph you drew.