Convert fahrenheit to celsius is c=5/9(f-32) convert 18c to fahrenheit

The standard deviation for a set of data is 5.5. the mean is 265. what is the margin of error?

Three numbers x, y, and z are in the ratio 2: 7: 8. if 12 is subtracted from y, then three numbers form a geometric sequence (in the order x, y–12, z). find x, y, and z. there are 2 sets.

What is the best approximation for the area of a circle with a radius of 4 m ? use 3.14 to approximate pi