Plz help (click on the pic)

Plz ! what is the volume of this pyramid? with numbers of 30cm 14cm 18cm

Write a numerical expression that satisfies all of the following conditions. 1.)the only number used in the expression is 5 2.)at least one exponent other than 1 is used 3.)when the expression is evaluated, the answer is greater than 40 and less than 50

New york is the 27th largest state in the united states. what percent of the 50 states in the us are larger than new york