2.7 x 10⁷ in standard form i need help quick

Identify a1 and r for the geometric sequence an= -256(-1/4) n-1

Acar travels at an average speed of 56 miles per hour. how long does it take to travel 196 miles

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.