Yesterday there were b milligrams of bacteria in a lab experiment. today there are b to the second power milligrams of bacteria. if there are 400 milligrams today, how many milligrams of bacteria were there yesterday?

Nnnnneeedd 1.find the residual if you know the actual number is 5.2 and the predicted value is 4.8

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

In the triangles, bc =de and ac fe.if the mzc is greater than the mze, then ab isdfelth