Janelle is painting a spherical model of a human cell for a science fair. She uses 615.44 square inches of paint to evenly cover the outside of the cell with one coat of paint. What is the diameter of the cel model?(use 3.14 for the value of pi.)

7. the area of the playing surface at the olympic stadium in beijing isof a hectare. what area will it occupy on a plan drawn to a scaleof 1: 500?

Determine the common ratio and find the next three terms of the geometric sequence. 10, 2, 0.4, a. 0.2; -0.4, -2, -10 c. 0.02; 0.08, 0.016, 0.0032 b. 0.02; -0.4, -2, -10 d. 0.2; 0.08, 0.016, 0.0032 select the best answer from the choices provided a b c d

Evaluate each expression. determine if the final simplified form of the expression is positive or negative -42 (-4)2 42