Mourner bought a watch and a calculator for $60.25. the calculator cost $16.90. how much did the watch cost?

After two years, how much has been paid into interest?

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 an bif a = {3, 6, 9, 12) and b = {2, 4, 6, 8, 10).