10 points for who ever !
when you use "applied over" in a scientific expression what operation would "applied over"

ex:
force applied over distance
speed applied over height
inches applied over centimeters

Find an equation of the line perpendicular to the graph of 28x-7y=9 that passes through the point at (4,1)

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

Given that sin∅ = 1/4, 0 < ∅ < π/2, what is the exact value of cos∅? a. (√4)/4 b. (√15)/4 c. (4π)/2 d. (4√2)/4