Cor A rectangle has a length of 4 inches and a width of 1 inches whose sides
are changing. The length is increasing by 9 in/sec and the width is
shrinking at 8 in/sec. What is the rate of change of the perimeter?

What is the difference between regular convex and concave polygons

The annual snowfall in a town has a mean of 38 inches and a standard deviation of 10 inches. last year there were 63 inches of snow. find the number of standard deviations from the mean that is, rounded to two decimal places. 0.44 standard deviations below the mean 2.50 standard deviations below the mean 0.44 standard deviations above the mean 2.50 standard deviations above the mean

What is the axis of symmetry of the function f(x)=-(x+ 9)(x-21)