Find the slope and the y-intercept of the equation. -3x + 9y = 18

Which is a reasonable estimate of the amount of water in a small, inflatable pool used by children?

Write numerical coefficient of y² in the expression 2x² - 15xy – 7y²

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