You have to be able to take the words written down and put them into mathematical symbols. The word "is" means =, the word "of" means to multiply, "what number" is x, your unknown. So translating that from words to an equation looks like this: 19 = .06x. Divide both sides by .06 to get x = 316 2/3
X = 25cm , i used pythagoras theorem to calculate this, 7^2 + 24^2 = 625, the square root of 625 = 25
10 xy + 3y + 20 ax + 6a = y(10x+3) + a(20x+6) = y(10x+3)+2a(10x+6)=
(y+2a)(10x+3)
