Find the slope of 3x-7y=21

The chart below shows the distribution of weeds in yard

The number of potato chips in a bag is normally distributed with a mean of 71 and a standard deviation of 2. approximately what percent of bags contain between 69 and 73 potato chips? approximately 68% approximately 71% approximately 95% approximately 99.7%

What is the value of x in the equation (2)3) (x+6)= -18 a. -36 b. -33 c. -24 d. -18