Please help.
Is algebra.
PLEASE HELP NO LINKS OR FILES.
I don't want links.

An objects motion is described by the equation d= 4sin (pi t) what will the height of the object be at 1.75 seconds?

International calls require the use of a country code. many country codes a 3-digit numbers. country codes do not begin with a 0 or 1. there are no restrictions on the second and third digits. how many different 3-digit country codes are possible?

Use composition to determine if (x) or h(x) is the inverse of f(x) for the limited domain x2-1.