Multistep sandy charges each family that she babysits a flat fee of $10 for the night and an extra $5 per child. kimmi charges$ 25 per night no matter how many children a family has write a two step equation compared the girls also is the fees are the same how many children they should have to charge same amount

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

What does x = in this equation x+3+2x=x+5

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