Plz brainliest and 20 points

find the missing lengths:

lh=45 and kh=30, find hi.

Evaluate the expression for the given value of the variable 7a - 4a for a =8

Find the midpoint m of z1=(8+5i) and z2=(12+3i)

Aplane intersects a pris paralel to the base of the prism. the cross section is a polygon wth eight sides. how many sides does the base of the prism have? a. 10 b. 8 c. 7 d. 9