For what value of k will the system of equations given below have no solution?

2x + 5y = 9
-3x - k y = 4

The number of nails of a given length is normally distributed with a mean length of 5.00 in, and a standard deviation of 0.03 in. find the number of nails in a bag of 120 that are less than 4.94 in. long.

What is the rate of change of a line that passes through (2,-5) and (6,-2)?

Arectangular garden is 5 feet long and 3 feet wide. a second rectangular garden has dimensions that are double the dimensions of the first garden. what is the percent of change in perimeter from the first garden to the second garden?