The sum of 2 numbers is 21. one number is 18 less than two times the other. find the numbers.

If f(x) =3x-2 and g(x) =2x+1 fins (f+ g) (x)

Two corresponding sides of two similar triangles are 3cm and 5cm. the area of the first triangle is 12cm2. what is the area of the second triangle?

Can you me with this question? i'll reward *30 points i just need with this one question so that i could solve the others. * edit: i originally set up the question to reward 30 points, but for some reason i can only reward 15. if you don't get 30, then i'm sorry. i'm still kind of new to this site