Th exact eometric mean is 14.500000 so it's D. Hope I could help!!
Answer is J not blue because the complement (opposite of being it) is 3/4. Blue is 1/4, so not being blue is 3/4.
Hope this helps :D
Group the like term 'c'
c(c-8)
(A) 4(x+5). Distribute the 4 (multiply both numbers by 4) and you get
4x+4*5
4x+20
(B) 70 km/h * y hours is 70y km, because you traveled 70 km every hour, so it's 70 times y.
Angles B and D are supplementary angles, so if B's angle is 30 degrees, then D's angle at y would be 150, since they have to add to 180.
In short, angle y = 150