Treven and Dylan each bought fruit at the market. Treven bought 3 pears and 7 apples. Dylan bought 4 pears and 9 apples and spent $3.00 on oranges. If p represents the cost of each pear and a represents the cost of each apple, the expression below represents the total cost. What is the value of x? xp + 16a + 3

The temperature of a chemical solution is originally 21 ? c . a chemist heats the solution at a constant rate, and the temperature of the solution 75 ? c after 1212 12 minutes of heating. the temperature, tt t , of the solution in ? c is a function of x , the heating time in minutes. write the function's formula.