The price of an article is increased from Rs 75 to Rs 78. Find the percentage increase in the price of the article.

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)

Does the point (1, sqrt 7) lie on circle shown.

Solve for x and select the correct answer