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He did?

Hectictar already answered this exact question.

I got 336 pizzas. 

Which model?

60% of 30 is 18
18 * 12 = 216


40% of 30 = 12

12*10 = 120

216 + 120 = 336

Therefore the answer is 336 pizzas

Here is a similar question answered here:

https://web2.0calc.com/questions/if-the-probability-that-a-baby-born-in-a-certain#r1

There are: 9999 - 1000 + 1=9000 numbers 4-digit numbers between 1000 and 9999

There are 28 numbers per 1000 numbers that have at least 2 zeros in them.

28  x  9 =252 numbers with at least 2 zeros between 1000 and 9999.

x = 252 / 9000 =7 / 250 =2.8%

Imagine if that was the same one who acted like they were you

The probability is 47/243.

Thanks Alan and Melody! That's really smart to substitute x=1 since that cancels the variables! Thanks so much!!!

What is the mean of 78 79 79 80 76 77 77 76 77 74 74   

The mean is the same as the average. 

I don't know why they have two words for the same thing. 

Add them up, then divide by how many there are.  

78 + 79 + 79 + 80 + 76 + 77 + 77 + 76 + 77 + 74 + 74 = 847  

                                                                                        847  

                                                                                      –––––  =  77  

                                                                                         11  

_.

Thank you so much! Im still a little confused how you got that though, could you give me an explanation?

(a) f(x) = (x - 1)/(x - 3)

(b) f(x) = (x - 1)/(2x - 6).

A similar question already has a thread: 

https://web2.0calc.com/questions/the-cubs-are-playing-the-red-sox-in-the-world-series_1 

I can help you, but only ifthe question is If  x% of four-digit numbers have a repeated digit (the repeated digits do not need to be adjacent), then what is x ? Express your answer as a decimal to the nearest tenth.. Did you have a typo? If so, tell me and I can help you with it