The length of DE is 4x + 8 and the length of EF is 5x - 1. What is the value of x?

The perimeter of a quarter circle is 14.28 miles. what is the quarter circle's radius?

Scarlett stopped at a campground along the appalachian trail. the campground had a 12 acre area for tents, divided into 6 equal campsites. scarlett picked one of the sections to pitch her tent. which expression would give you the size of scarlett’s campsite? (more than one answer

∠a and ∠ b are complementary. if m∠ b = 80°, what is the measure of ∠ a? 10° 80° 90° 100°