Please help timed test

According to the general equation for conditional probability if p(anb)=3/7 and p(b)=7/8 what is p(a i b)

Carl is hanging pictures in his home. there is a space on a wall that has a width of 4 feet. carl has pictures with different widths. which picture width would fit in the space on the wall? a. 46 inches b. 60 inches c. 50 inches d. 54 inches

Is the ordered pair (-10, 7) a solution to the equation y = 17 – x? yes or no