When you lose a game but you forget that you are playing seceretly

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

Two planes leave an airport at the same time, one flying east, the other flying west. the eastbound plane travels 20 mph slower. they are 1600 mi apart after 2 hr. find the speed of each plane.

Jenisey has $24 to spend on seven pencils. after buying them she had $10. how much did each pencil cost.?