A parabola has a focus of (–10, 2) and a directrix of y = 4. What is the parabola’s equation? a) y = 1/4 (x - 10)^2 - 3
b) y = 1/4 (x + 10)^2 + 3
c) y = - 1/4 (x - 10)^2 - 3
d) y = - 1/4 (x + 10)^2 + 3

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

The weight of an object in the water is 7% of its weight out of the water. what is the weight of a 652g object in the water?

2.5 milligrams is equivalent to how many grams