Acard is drawn from a deck of 52 cards. find the probability of drawing a black card or spade

Acar started driving from city a to city b, distance between which is 620 miles, at a rate of 60 mph. two hours later a truck left city b and started moving towards city a at a rate of 40 mph. how many hours after the truck's departure will the two meet?

You have 138.72 in your saving account u take out 45.23 and 18.00 you deposit 75.85 into your account

1) prove that 731^3−631^3 is divisible by 100 2) prove that 99^3−74^3 is divisible by 25