The students in the fourth grade sold 684 erasers for a fund-raiser. they sold 4 times as many erasers as the students in fifth grade. how many erasers did the students in 5 grade sell?

If eh = hg and hg=16, find the diameter of k

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

Pls yall i really need the answer fr fr