Question

what does change in time mean

Answer 1

it usually means the time elapsed during whatever it is your measuring,
generally the formula would be t(final)-t(initial) = change in time

Answer 2

what about change in velocity

Answer 3

acceleration

Answer 4

change in time of the velocity :P

Answer 5

thanks

Answer 6

d y change of y usually used to denote magnitude
---- -
d x change of x usually used to denote time

i think this is correct

Answer 7

what does miles per hour mean