Plz urgent (Brainliest) Factor the expression.
m^2 - 3mn - 28n^2
A. (m+4n) (m-7n)
B. (m-4n) (m+70)
C. (m-2n)(m +14n)
D. (m+2n) (m-14n)

Triangles abc and dfg are given. find the lengths of all other sides of these triangles if: b ∠a≅∠d, ab·dg=ac·df, ac=7 cm, bc=15 cm, fg=20 cm, and df-ab=3 cm.

Subject: geometryneed with 6 and 7

Item 1 which question could the expression 1000n answer? let n = the number of gallons of gas used. how many miles per gallon did the car get driving 1000 miles? let n = the number of grams of food needed for each dog. how many grams of food are needed to feed 1000 dogs? let n = the number of people at the show. how many empty seats were there at the show if there are 1000 seats at the theater? let n = the number of seats at the theater. how many empty seats will there by if 1000 people come to the show?