Helpp. w an explanation

What is (28 + 7 + 6 + 3) x 1/2 show your work

Acar travels at an average speed of 52 miles per hour. how long does it take to travel 299 miles

Lindsay used two points, (x,y; ) and (+2.82), to find the equation of the line, y = mx + b, that passes through the points. y2-y, first, she used the definition of slope and determined that the value of mis x, - . given this information, which expression must represent the value of b?