My question is ''If this stack of magazines is about 1m tall, how much magazines do you thinkg would be in there'' please tell me the best answers this is important part of my grade

Use the diagonals to determine whether a parallelogram with vertices u(2,−2), v(9,−2), w(9,−6), and x(2,−6) is a rectangle, rhombus, or square. give all the names that apply.

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)

Ijust need to see how to do this. so you don’t have to answer all of them just a step by step explanation of one.