8(2x+9)=56 i dont understand i did distributive property and i am stuck

Write two subtraction equations that are equivalent to 5 + 12 = 17.

(05.08a)triangle abc is transformed to similar triangle a′b′c′ below: a coordinate plane is shown. triangle abc has vertices a at 2 comma 6, b at 2 comma 4, and c at 4 comma 4. triangle a prime b prime c prime has vertices a prime at 1 comma 3, b prime at 1 comma 2, and c prime at 2 comma 2. what is the scale factor of dilation? 1 over 2 1 over 3 1 over 4 1 over 5

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