How to simplify -4=-2/3x

Given: hf || jk; hg ? jg prove: fhg ? kjg to prove that the triangles are congruent by asa, which statement and reason could be used as part of the proof? fgh ? kgj because vertical angles are congruent. jkg ? hfg because vertical angles are congruent. fhg ? jkg because right angles are congruent. hfg ? kjg because alternate interior angles are congruent.

What is the simplified form of (3.25x10^3)(7.8x10^6) written in scientific notation?

In a class, there are 12 girls. if the ratio of boys to girls is 5: 4 how many boys are there in the class