What is the area of triangle abc? 2.5 square units o3 square units 3.5 square units 4 square units

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)

The price of an item has been reduced by 30%. the original price was $30. what is the price of the item now ?

Can someone me do math because i am having a breakdown rn because i don’t get it