Cos 25° cos 20° - sin 25° sin 20° please help

Iwill give brainliest. suppose tommy walks from his home at (0, 0) to the mall at (0, 5), and then walks to a movie theater at (6, 5). after leaving the theater tommy walks to the store at (6, 0) before returning home. if each grid square represents one block, how many blocks does he walk?

Y+ 2/y is it a polynomial in one variable or not? and if so, why?

What is the approximate difference in tenths between √12 and √15?