How many even numbers can be formed from the digits 1,2,3,4,5?

The number of fish in a lake can be modeled by the exponential regression equation y=14.08 x 2.08^x where x represents the year

For what values of the variable x is the expression square root of 7x+14+ square root of 7-x a real number?

Ametal rod is 2/5 meters long. it will be cut into pieces that are each 1/30 meters long. how many pieces will be made from the rod?