Cos(x)=0.2 Solve the equation in the interval from -90° to 450° in degrees.

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)

In parallelogram abcd the ratio of ab to bcis 5: 3. if the perimeter of abcd is 32 find ab

Solve each quadratic equation by factoring and using the zero product property. [tex]x^2+6x+8=0[/tex]