Which answer shows 8.45 * 10^4 written in standard form? a) 0.000845 b)8,450 c)84,500 d)8,450,000

10 ! a train starts from grand city and travels toward belleville 388 miles away. at the same time, a train starts from belleville and runs at the rate of 47 miles per hour toward grand city. they pass each other 4 hours later. find the rate of the train from grand city.

If the scale factor between two circles is 2x/5y what is the ratio of their areas?

Identify the initial amount a and the growth factor b in the exponential function. a(x)=680*4.3^x