Please somebody help me with this! Erin is trying to lift a piano to the second story of a building. How many pulleys would require the least amount of effort force from Erin. A. 1 pulley
B. 2. pulleys
C. 3 pulleys

The magnitude, m, of an earthquake is defined to be m=log l/s, where i is the intensity of the earthquake (measured by the amplitude of the seismograph wave) and s is the intensity of a “standard” earthquake, which is barely detectable. what is the magnitude of an earthquake that is 1,000 times more intense than a standard earthquake? use a calculator. round your answer to the nearest tenth.

Drag the tiles to the boxes to form correct pairs. not all tiles will be used. match each set of vertices with the type of quadrilateral they form

Aflower has 26 chromosomes. to create a new flower, how many would a sperm cell have what is called?