Ryan cleans his room for 3 minutes and 47 seconds .Melissa cleans her room for 5 minutes and 19 seconds. How much longer Melissa clean her room than Ryan?

Find the number of positive three-digit even integers whose digits are among 9, 8, 7,5, 3, and 1.

Which shows one way to determine the factors of 4x3 + x2 – 8x – 2 by grouping?

9.4.34  question   to estimate the height of a stone  figure, an observer holds a small square up to her eyes and walks backward from the figure. she stops when the bottom of the figure aligns with the bottom edge of the  square, and when the top of the figure aligns with the top edge of the square. her eye level is 1.811.81 m from the ground. she is 3.703.70 m from the figure. what is the height of the figure to the nearest hundredth of a  meter?