How do I use the distributive property to write (e+f)(-5) as an equivalent algebraic expression?

Answer 1

just think of the way you do it with numbers

5(2+3) = 5*2 + 5*3 = 10 + 15 = 25

(e+f)(-5) = e(-5) + f(-5) = -5e -5f

Answer 2

n+2x10 when n=5