Linda used a triple beam balance to find the mass of three identical math textbooks. if the total of the three textbooks is 654 grams, what is the mass of each textbook?

On an airplane there are two seats on the left side and three seats on the right side there are 90 seats o the right side of the plane

Answer this 30 points and brainliest!

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)