An object is launched from ground level with an initial velocity of 400 feet per second. to the nearest tenth of a second, how long does it take the object to reach a height of 650 feet? [use the formula h = -16t2 + v0t + s0.]

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)

Find the solution of this system of equation -7x+y=-20 9x-3y=36

Find the actual dimensions of the box. the side length are in meters and integers. the surface area of the box is 104 m2 and volume of the box is 60 m3.