If you mean -2a+6a then it simplifies to 4a
qwdasd
7
If you mean: (2a+9)(5a-6) then it is 10a^2+33a-54
If you mean: 4a-3 = 2a+7 then the value of a works out as 5
zone 2A
(not seismic, seismic wave)Seismic waves are waves of energy that travel through the earth.
A seismic zone is defined as a region in which the rate of seismic activity is fairly consistent The Seismic zone for Charleston WV is in Zone 1.
seismic zone
shadow zone
A Wadati-Benioff zone is a deep level seismic zone on the line of subduction, which can be as deep as 700 kilometres.
If you mean 2a times a and a is a variable, the answer would be 2a2.
Shadow zone
Shadow Zone
Shadow Zone
refraction refraction
If you mean -2a+6a then it simplifies to 4a