Write each phrase as an expression. The difference of 3 and a number x

How do i start to solve? would appreciate a walk-thru! a bird sitting 16ft above the ground in an apple tree dislodges an apple. after how many seconds does the apple land on the ground? (assuming that no branches will interfere with it's fall)

Lola says these two expressions have the same value. expression a expression b which explains whether lola is correct?

Solve each quadratic equation by factoring and using the zero product property. 14x - 49 = x^2