347,456 round to the place value of the underlined digit. the four being in the ten thousand places

Y=4x^2+x-1 solve using quadratic formula

Which best explains why this triangle is or is not a right triangle?

In the given triangle, ∠aed ∼ ∠ abc, ad = 6.9, ae = 7.2, de = 5.2, and bc = 10.2. find the measure of bd and ce. round your answer to the nearest tenth.