Apropeller rotates 6 times every 15 seconds. based on this information, which of the following could not be true?

a. the propeller rotates 30 times in 90 seconds.
b. the propeller rotates 24 times in one minute.
c. the propeller rotates 18 times in 45 seconds.
d. the propeller rotates 12 times in 30 seconds.

What is the missing constant term in the perfect square that starts with x^2 -20x

Write a function for a rotation 90 degrees counter clockwise about the origin, point 0

In the figure below, ∠dec ≅ ∠dce, ∠b ≅ ∠f, and segment df is congruent to segment bd. point c is the point of intersection between segment ag and segment bd, while point e is the point of intersection between segment ag and segment df. the figure shows a polygon comprised of three triangles, abc, dec, and gfe. prove δabc ≅ δgfe.