Fill in the blank with a number to make a true statement. *
0.25 / ? = -0.25

If f(x)=3x+1 and f^-1=x-1/3, then f^-1(7)=

Use the distributive law to multiply. 3(4x + 5y + 6)

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