The difference of two numbers is 8. When twice the first number is added to three times the second number, the result is 51. What are the two numbers?

A.
12 and 4
B.
15 and 7
C.
20 and 12
D.
23 and 15

At which value in the domain does f(x) =0?

Me asap on # : explain how factoring a trinomial, ax^2+ bx+ c, when a does not equal 1 different from factoring a trinomial when a = 1.

Atrain leaves little? rock, arkansas, and travels north at 90 kilometers per hour. another train leaves at the same time and travels south at 80 kilometers per hour. how long will it take before they are 680 kilometers? apart?