The temperature fell 4 degrees in the last hours. now it is 21 degrees. write and solve an equation to find the temperature it was 1 hour ago.

Will used 20 colored tiles to make a design in art class. 5/20 of his tiles were red. what is an equivalent fraction for the red tiles?

How to do this , and can some one explain

Pepe and leo deposits money into their savings account at the end of the month the table shows the account balances. if there pattern of savings continue and neither earns interest nor withdraw any of the money , how will the balance compare after a very long time ?