David can finish painting the room in 6 hours, and his elder brother Antony can finish it in 4 hours. If both brothers paint the room together, how many hours will it take them?

136 degrees is the same as radians

The tide, or depth of the ocean near the shore, changes throughout the day. The depth of the bay can be modeled by d = 35 - 28 cos (π/6.2 t) where d is the depth in feet and t is the time in hours. Consider a day in which t = 0 represents 12:00 A. M.

The heights, in cm, of some pupils are: 149 111 171 166 152 129 162 144 a) Find the mean height of the pupils. b) Find the median height of the pupils. c) Find the range of the heights of the pupils.

Find the difference between the highest and lowest number 0 and 7

Write the series 2+4+6+8 in sigma notation

How many significant digits are in thus number 74.30

When the radius of a circle is multiplied by a factor of 2 22, by what factor will the area of the circle change?

What is 0.0009999 closest to? 0, 1/2, or 1

A sum of scalar multiples of two or more vectors (such as c 1 Bold u plus c 2 Bold v plus c 3 Bold wc1u+c2v+c3w , where c Subscript ici are scalars) is called a linear combination of the vectors.

50) The first year Beth worked she earned n. The second year she earned 500 more than twice what she made the first year. The third year she earned 500 less than twice what she made the second year.