I need help NO LINKS

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

Cole says the distance between points (-5,0) and (0,-5)is 5 units. is he correct? explain why or why not.

The amount cami raised during last year’s charity walk, $45.50, is 7/10 of the amount she raised this year. which equation represents n, the number of dollars she raised this year?