Answer the following 3(4x-5) + 4(2x+6)=? -8(2a-3b)-5(6b-4a)=? and x is a letter not a sign

The number of chocolate chips in an 18-ounce bag of chocolate chip cookies is approximately normally distributed with a mean of 1252 chips and standard deviation 129 chips. (a) what is the probability that a randomly selected bag contains between 1100 and 1500 chocolate chips, inclusive? (b) what is the probability that a randomly selected bag contains fewer than 1125 chocolate chips? (c) what proportion of bags contains more than 1225 chocolate chips? (d) what is the percentile rank of a bag that contains 1425 chocolate chips?

Which is the equation of a line perpendicular to the line with the equation 3x+4y=8

Pranza plotted point a in the coordinate plane below.