Factorise.. 25a sq. - 9b sq. please tell the answer​

50 points! antonio made a scale model of a building. the model's scale is 1 inch to 235 feet and its height is 3.5 inches. what is the exact height of the actual building? enter your answer in the box.

Seattle, washington is known for being rainy. one day last month, 8 inches of rain fell in 1 1/2 hours. what us the rate of the rainfall expressed in ft per plzzz write a proportion i will give you 100 points

1) prove that 731^3−631^3 is divisible by 100 2) prove that 99^3−74^3 is divisible by 25