Find the slope of the line through each pair of points

please help i don’t understand

One card is dealt from a 52 card deck. find the probability that the dealt card is a 4 or a black 7

Find the greatest common factor of -30x 4 yz 3 and 75x 4 z 2.

The box plots show the average speeds, in miles per hour, for the race cars in two different races. which correctly describes the consistency of the speeds of the cars in the two races?