+0  
 
0
41
4
avatar+269 

I need help asap! Thanks in advance! 

LaughingFace  Apr 25, 2018
Sort: 

4+0 Answers

 #1
avatar+626 
+2

87. 

 

Since there are three digits and each digit has 10 options,

 

there are a total of:

 

10^3 ways of identifying students. 

 

The first number can be a 0, since it is not supposed to be a number, just an identification. 

 

10^3 = 1000

 

That is you final answer. 

GYanggg  Apr 25, 2018
 #2
avatar+626 
+2

88.

 

There are a total of:

 

\(\binom{15}{4}\)

 

ways to choose the debaters. 

 

This is equal to 1365.

 

Since we need those four people, with only one way to choose them.

 

The chance this will happen is 1/1365. 

GYanggg  Apr 25, 2018
 #3
avatar+2592 
+1

89. The probability of choosing a dime first is \(\frac{2}{10}=\frac{1}{5}\) .

Next, picking a quarter without replacement is just \(\frac{3}{10}\).

Multiplying, we get \(\frac{1}{5}*\frac{3}{10}=\frac{3}{50}\)

tertre  Apr 25, 2018
 #4
avatar+2592 
+1

90.

The total number of marbles: \(12+8+4+16=40\)

Blue Marble: \(\frac{4}{40}=\frac{1}{10}\)

Red marble: \(\frac{12}{40}=\frac{3}{10}\)

So, the answer is just \(\frac{1}{10}*\frac{3}{10}=\boxed{\frac{3}{100}}\)

smileysmiley

tertre  Apr 25, 2018

21 Online Users

avatar
New Privacy Policy (May 2018)
We use cookies to personalise content and ads, to provide social media features and to analyse our traffic. We also share information about your use of our site with our social media, advertising and analytics partners.  Privacy Policy