4. Which of the following statements is false? A) sin 15° - cos 65
B) sin 70º = cos 20"
C) cos 43° = sin 47
D) sin 12 = cos 78°

What percent of the circle below is shaded?

Aregular pentagon with a perimeter of 21 inches is dilated by a scale factor of 5/3 to create a new pentagon. what is the perimeter of the new pentagon?

Find the volume of the solid obtained by rotating the region enclosed by the curves y=1x and y=7^-x about the x-axis. (use symbolic notation and fractions where needed.) volume =