Cynthia has a plan to save money for bubble gum. Her plan is for today to puts 7 quarters in a jar. Tomorrow, she will put the initial amount in plus another 7 quarters. Each day she will put 7 quarters more than she put into the jar the day before, as shown in the table.

An animal shelter spends $4.00 per day to care for each bird and $6.50 per day to care for each cat. olivia noticed that the shelter spent $212.00 caring for birds and cats on thursday. olivia found a record showing that there were a total of 38 birds and cats on thursday. how many birds were at the shelter on thursday?