Can anyone tell me if I have done this correctly or not? It's the modelling of heat equation with in homogeneous material w. r.t time and space

Julia chooses a card at random from her set of cards. what is the probability that the card is labeled cat or hamster?

Hello can you me find all the products

Acollection of coins has value of 64 cents. there are two more nickels than dimes and three times as many pennies as dimes in this collection. how many of each kind of coin are in the collection?