How do i solve this Geometry problem? and answer please?

Question

I forgot how to do algebra and geometry over the summer.

and now that im in high school i dont really remember how to do algebra for geometry. so could you please explain to me how to solve the answer and the answer to this please?

1. distance formula - solve for t: D = rt

2. area of a trapezoid - solve for h: A = 1/2 h (base 1 = base 2)

Answer 1

t=d/r

h=2a/(the bases)

Answer 2

1. divide rt by r

so that makes it dr=t

i think

rt is multiplied together to you have to cancel r out by division

Answer 3

1) divide by r

t = D/r

2) Mult by 2

2A = h( b1+b2)

Divide by (b1+b2)

h = 2A / b1+b2