Use FOIL
28x² -8xy +7xy -2y²
28x² -xy -2y²
A maxm speed of 55 mph means that the speed has to be lexx than or equal to 55
x <= 55
Written out numerically, it is 4x4x4. To work this out you multiply 4x4= 16 and then you have one more 4 to multiply by, so you multiply 16x4=64
Answer:The equation of a line is written as y=mx+b, where the constant m is the slope of the line, and the b is the y-intercept.
Step-by-step explanation: