Factor completely 7x^2-31x-20 7x^2-45x-28 5p^2-p-18 7k^2+9k 2b^2+17b+21 28n^4+16n^3-80n^2 3b^3-5b^2+2b 20n^b-97nb+30b 9p^2r+73pr+70r 4x^3+43x^2+3-x 7x^2-32x-60 9r^2-5r-10 9x^2+7x-56 10m^2+89m-9

What is the ratio of the change in y-values to the change in x-values for this function? a) 1: 13 b) 2: 5 c) 5: 2 d) 13: 1

Atriangle has a side lengths of 18cm, 80 cm and 81cm. classify it as acute obtuse or right?

Afactory makes propeller drive shafts for ships. a quality assurance engineer at the factory needs to estimate the true mean length of the shafts. she randomly selects four drive shafts made at the factory, measures their lengths, and finds their sample mean to be 1000 mm. the lengths are known to follow a normal distribution whose standard deviation is 2 mm. calculate a 95% confidence interval for the true mean length of the shafts. input your answers for the margin of error, lower bound, and upper bound.