15z = 15 x 6 = 90
3 6
33
Sure thing, honey. If a equals 8, then you just substitute that bad boy in for a in the expression a-2. So, 8-2 equals 6. Ta-da! Your answer is 6. Hope that clears things up for ya, sugar.
x=y-8 z=x+12
b2 - 7b - 6b = -4(-4)2 - 7(-4) - 6 = 16 +28 - 6 = 38
46
-16
find out what 6 squared equals. which is 6 x 6 and that equals 36
55
14
42, because if there is nothing between the 7 and 'a' and 'a' equals 6 then the answer is 42.
D = 210