For the sequence given recursively by ak = 2ak-1 - 3 for k > 2, where a1 = 4, someone has guessed a closed form and used the predicate r(n) for the statement "an = 2^n-1 +3." an = 23. oro s (a) are r(1), r(2), r(3), and r(4) true?

What could explain what happened when the time was equal to 120 minutes

Angle xyz is formed by segments xy and yz on the coordinate grid below: a coordinate plane is shown. angle xyz has endpoints at 3 comma negative 1 and 6 negative 2 and 3 comma negative 3 and measures 36.87 degrees. angle xyz is rotated 270 degrees counterclockwise about the origin to form angle x′y′z′. which statement shows the measure of angle x′y′z′?

1/4x+5=3/4. i can't get access to the answer to this question! and, my request on "contact us" will not go