If a6 = -1\1215 and a9= -1\32805 find r

Twice the sum of a number and 2 is equal to three times the difference of the number and 8. find the number.

What is the value of -3/4 to the 4th power? -256/81 -81/256 81/256 256/81

The equation m = 19.32v can be used to find the mass m in grams of a pure gold coin with volume v in cubic centimeters. carl has a coin with a mass of 37.8 grams. the coun's volume is 2.1 cubic centimeters. could the coin be pure gold? explain your reasoning. whoever answers this correctly gets marked brainliest! this is also worth a decent amount of points than normal questions!