Find f(-2)for f(x)=5*3^x

Find an equation for the linear function which has slope -10 and x-intercept -7

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.

Eden has a part time job. she is paid ? 7.20 an hour the week she worked 18 and a half hours how much is she paid