Which expression is equivalent to m n + z?
n m + n
z + m z
m z + n
z + n m

Given the equation f(x)=a(b)x where the initial value is 40 and the growth rate is 20% what is f(4)

Expresa commuter train leaves downtown sation and travels at a average speed of 55 miles per hour towards the north side sation, which is 50miles away. thirty minutes later, express commuter train #7 leaves north side and travels at a average speed of 35miles per hour towards downtown sation. at the moment the two trains pass each other, how far(in miles) is train #12 from the downtown sation and how long(in minutes) has the #12 train been traveling

Could someone with number 1 and 2