Answer:
-.5=x or -1/2=x
Step-by-step explanation:
x+3=3x+4
-x -x
3=2x+4
-4 -4
-1=2x
/2 /2
-.5=x or -1/2=x
Answer:
D
Step-by-step explanation:
Answer: 11% of students go to college
Step-by-step explanation: So simply take 36/325 since only 36 are going to college, divide and you get roughly 11%
Answer:
rule add 15 subtract 10
Step-by-step explanation:
rule add 15 subtract 10
Answer:
it saves 2.5 minutes
Step-by-step explanation:
The expected value of a random variable is the sum of products of possibilities and the probability of each.
Here, you have a probability of 0.9 of saving 5 minutes, and a probability of 0.1 of adding 20 minutes.
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The expected value of the shortcut is ...
0.9(-5) +0.1(20) = -4.5 +2.0 = -2.5
The shortcut is expected to save 2.5 minutes on average.
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<em>Additional comment</em>
The probability of 0.9 comes from the 9 of 10 trips that result in a time saving.