The following table shows the length and width of two rectangles:

length width
rectangle a 3x + 2 2x - 1
rectangle b x + 5 5x - 1

which expression is the result of the perimeter of rectangle b minus the perimeter of rectangle a?
2x + 2
2x + 6
22x + 14
22x + 18

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

In priyas math class there are 10 boys and 15 girls. what is the ratio of boys to girls in priyas math class? express your answer as a decimal

The frequency table shows the results of a survey comparing the number of beach towels sold for full price and at a discount during each of the three summer months. the store owner converts the frequency table to a conditional relative frequency table by row. which value should he use for x? round to the nearest hundredth. 0.89 0.90 0.92 0.96