Zach and ginny are building model cars. ginny's car is 2 more than 3 times the length of zach's car. the sum of the lengths of both cars is 30 inches write an equation to determine the lengths of zach's and ginny's cars.
a.3x + 2 = 30
b. x + 2 + 3x = 30
c.2x + 3 = 30
d. x + 2x + 3 = 30

People end up tossing 12% of what they buy at the grocery store. assume this is the true population proportion and that you plan to take a sample survey of 540 grocery shoppers to further investigate their behavior. a. calculate the mean and the standard error for the sample proportion p. b. describe the sampling distribution of p in part a. draw a graph of this probability distribution with its mean and standard deviation. what is the probability that your survey will provide a sample proportion more than 15%? c. d. population proportion? what is the probability that your survey will provide a sample proportion within + 0.03 of the