[Reposting because I never got help]

Is the polynomial a difference of squares? Select Difference of squares or Not a difference of squares for each polynomial.

y^4−25

20m^2n^2−121

p^8−q^5

16x^2−81

Which graph shows a function with a range of all real numbers greater than or equal to -1

Find the area of a trapezoid with bases 14 cm and 18 cm and height 10 cm. 160 cm2 140 cm2 180 cm2 126 cm2

Rockwell hardness of pins of a certain type is known to have a mean value of 50 and a standard deviation of 1.1. (round your answers to four decimal places.) (a) if the distribution is normal, what is the probability that the sample mean hardness for a random sample of 8 pins is at least 51?