Please help me worth branliest and don’t do links ty

Find the solution of system of equation y= x-4 y=4x+2

Given a circle with measures of (c, d, and r) and a circle with measures of (c', d', and r'), what is d if c c' = 12 and d' = 0.50? a) 3 b) 6 c) 12 d) 24

The standard deviation for a set of data is 5.5. the mean is 265. what is the margin of error?