<em>Answer:</em>
<em>d = 10</em>
<em>Step-by-step explanation:</em>
<em>3/4(6 + d) = 12</em>
<em>(18 + 3d)/4 = 12</em>
<em>18 + 3d = 48</em>
<em>3d = 48 - 18</em>
<em>3d = 30</em>
<em>d = 30 : 3</em>
<em>d = 10</em>
Answer:
51 yellow marbles
Step-by-step explanation:
work backwards~
6 more than: subtract 6=60
4 times: 60÷4=15
66-15=51
(that should be right)
Diana had chocolate, and ate some, leaving 0.75 of it for Sarah.
Answer:4.75961
Step-by-step explanation:
7.7x0.35=2.695x1.79=<u>4.75961</u>
Answer:
Step-by-step explanation:
Given that IQ mean is 100 and std dev = 12 for normal adults

Std error = 

i.e. sample size should be atleast 97
The required sample size is 97.
This is reasonable as this is greater than 30
Yes. This number of IQ test scores is a fairly large number.