Factor-71*2182 + 3x-9 by grouping. What is the resulting expression? ) O (3-7x) (x²-3) O (7-3) (3 + 2 O (3-7x²)(x-3) O (7x² - 3)(3 + x)​

Ametalworker has a metal alloy that is 30? % copper and another alloy that is 55? % copper. how many kilograms of each alloy should the metalworker combine to create 90 kg of a 50? % copper? alloy?

1. 2. ∠b and ∠y are right angles. 3.? 4.? which two statements are missing in steps 3 and 4? ∠x ≅ ∠c △abc ~ △zyx by the sas similarity theorem. ∠b ≅ ∠y △abc ~ △zyx by the sas similarity theorem. = 2 △abc ~ △zyx by the sss similarity theorem. = 2 △abc ~ △zyx by the sss similarity theorem.

What is the gcf of 20c^3-5c^4+30c^6