Help anybody for numbers 10 and 11

Which radical expression is a rational number? a. √ 360 b. √ 644 c. √ 225 d. √ 122

Jorge wants to determine the enlarged dimensions of a digital photo to be used as wallpaper on his computer screen. the original photo was 800 pixels wide by 600 pixels high. the new photo will be 1,260 pixels wide. what will the new height be?

Which equation can be used to measure the density of water in a spherical water tank? let w represent the number of water particles within the region.