(u) suivc iuli. allied health nurses use a formula known as young's rule to determine the amount of medicine to give a child under 12 years of age when the adult dosage is known. als nie scule c = ad/a + 12 is the child's dose; a is the age of the child in years; d is the adult dose. (a) work backward and find the adult dose in terms of the child's dose. solve for d. (b) find d if c = 0.05 gram and a = 7.

The students at jefferson middle school are raising money for a charity by selling t-shirts and hats. the number of t-shirts sold was 3 times the number of hats. the profit was $5 for each t-shirt sold and $2.50 for each hat sold. the students raised $840 for the charity. they used the system below to analyze their success and found the solution to be (144, 48). 5x+2.50y=840 x=3y how much did they earn from t-shirt sales?