If ~$(\frac{1}{5})^m×(\frac{1}{4})^{18}=\frac{1}{2×10^{35}}$~ , then m =

In a stack of boards at a lumber yard, the 20th board counting from the top of the stack is immediately below the 16th board counting from the bottom of the stack. How many boards are in the stack?

A certain taxi company charges \$3.10 for the first 1/5 of a mile plus \$0.40 for each additional 1/5 of a mile. What would this company charge for a taxi ride that was 8 miles long?

The product P of two prime numbers is between 9 and 55. If one of the prime numbers is greater than 2 but less than 6 and the other is greater than 13 but less than 25, then P =

A grocery store purchased crates of 40 oranges each for \$5.00 per crate and then sold each orange for \$ 0.20. What was the store's gross profit on each crate of oranges?