Afreight train and an express train leave towns 390 miles apart at the same time, traveling toward one another. the freight train travels 30 mph slower than the express train. they pass one another 3 hours later. what are their speeds?

(if f(x)=4x^2 and g(x)=x+1, find (f o g)(x)

Indicate the formula for the following conditions: p^c(n, r)=

Add, subtract, multiply, or divide as indicated. list any restrictions for the variable(s) and simplify the answers when possible. 1) x-2 / x+5 + 3x / 2x-1 2) x+6 / x-6 - x^2 / x+6 3) x+9 / x-4 + x+2 / x^2-11x+28 4) x / x^2-64 + 11 / 2x^2+11x-40 5) 5 / x + 11 / x-3 - x-4 / x^2+2x-15