Hel 9. Suppose that the Math Man, a super hero that fights crime with math and physics, can decelerate the rate
of gravity. During a recent fight with a diamond thief, Math Man fell from the top of a 500 meter building. The
equation:

d = t^2 x 0.25

describes Math Man's distance from the ground as he falls.

How long does Math Man spend falling if he falls?

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

I’m really confused and need to learn this

Given the numbers c = –3 and d = 4, which statement is true? a. |–c| = 3 and |–d| = –4 b. |–c| = 3 and –|d| = –4 c. –|c| = –4 and –|d| = 3 d. |–c| = 3 and –|d| = 4