Is the sum of 4.2 and 2 squared irrational or rational ?

Select the lengths in centimeters that would form a right triangle

What is the axis of symmetry of the function f(x)=-(x+ 9)(x-21)

The price of a dozen eggs was $1.63. suppose the price increases m dollars per dozen and then the price decreases $0.12 per dozen. which expression represents the current price of eggs after the two price changes?