Is k + 12 greater than or equal to 20 , k= 15

Someone this asap for a group of students attends a basketball game. * the group buys x hot dogs at the concession stand for $2 each. * the group buys y drinks at the concession stand for $3 each. the group buys 29 items at the concession stand for a total of $70. how many hot dogs did the group buy?

Add the fractions and simplify 1/2+ 1/3

How is working backward similar to solving an equation?