4. Anna wants to find the height of the tallest building in her city. She stands 384 feet away from the building. There is a tree 31 feet in front of her that is 20 feet tall. How
tall is the building to the nearest foot?

Evaluate the expression for the given value of the variable 2×(c2-5) for c=4

If the speed of an electromagnetic wave is 100,000 cm/s and its wavelength is 100 cm, what is its frequency? a) 100,000 cycles per second (hz) b) 1 × 10-3 cycles per second (hz) c) 10,000,000 cycles per second (hz) d) 1,000 cycles per second (hz)

What percent of 18 is 24? and plz explain thx.