Find an expression Which represents the sum of(-10x-10y) and (-9x-7y) in Simplest terms

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.

The standard deviation for a set of data is 5.5. the mean is 265. what is the margin of error?

Change negative exponents to positive, then solve