Hello, ksinger!

I'll get you started on #1 . . .

. . . .

We are expected to know these two parametric equations for projectile motion.

. .

If is at the origin, then point is

We have: . .[1]

And: . .[2]

Substitute [1] into [2]:

. .

. .

. .

Multiply by 0.4: .

Factor: .

. .