PLZ SOLVE FOR BRAINLIEST

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

Find the gradient of f(x,y,z)equals=left parenthesis x squared plus y squared plus z squared right parenthesis superscript negative 1 divided by 2 baseline plus ln left parenthesis x right parenthesis x2+y2+z2−1/2+ln(xyz) at the point left parenthesis negative 2 comma 1 comma negative 2 right parenthesis(−2,1,−2).

One integer is 8 times another. if the product is 72, then find the integers