David’s scores on the first three of four 100-point math tests were 86, 92, and 89. what score does he need on his fourth math test to ensure an average score of at least 90?

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?