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

Arley is building a model of a city map. in one part of the city, three roads form a right triangle, which harley draws as triangle abc, with the following measures: m∠b=90° and m∠a=30°. in his scale model, the hypotenuse of triangle abc, ac¯¯¯¯¯¯¯¯, has a length of 817−−√ cm. what is the value of a (the length of bc¯¯¯¯¯¯¯¯)?

Which number produces a rationale number when multiplied by 1/5

Simplify. −4x^2 (5x^4−3x^2+x−2) −20x^6−12x^4+8x^3−8x^2 −20x^6+12x^4−4x^3+8x^2 −20x^8+12x^4−4x^2+8x −20x^6+12x^4+4x^3−8x^2