The members of an Olympiad team contributed a total of $1.69 for refreshments for their weekly practice. Each member contributed the same amount and paid for his or her share in five coins. How many nickels were contributed by all of the members? Note: the question did not state how much members there were.

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

Acylinder has volume 45π and radius 3. what is it’s height?

Ascientist wants to use a model to present the results of his detailed scientific investigation. why would a model be useful? a )because the model makes the concepts easier to understand b) because the model is easy to put together and to use c) because the model prevents other scientists from asking questions d) because the model requires the audience to pay full attention to it i don't know what to choose because between a and d a is much more likely than d because it only wants to get the attention of the audience. i'm confuse.