Ngo has collection of dimes and quarters with a total value of $3.50. the number of dimes is 7 more than the number of quarters. how many of each coin does he have?

In parallelogram abcd the ratio of ab to bcis 5: 3. if the perimeter of abcd is 32 find ab

Find the area between y=e^x and y=e^2x over [0,1]

At the movie theatre, child admission is $5.20 and adult admission is $9.70. on sunday three time as many adult tickets as child tickets were sold, for a total sales of $788.90. how many child tickets were sold that day?