Answer: x=85
Step-by-step explanation:
you want to isolate the variable, so:
3.5x+197=494.5
Subtract 197 on both sides of the equation
3.5x=297.5
Divide both sides by 3.5 so now c is by itself on one side of the equation
x=85
Correct Answer:Option A. 0.01
Solution:This is a problem of statistics and uses the concept of normal distributions. We need to convert the score of 90 into z-score and then find the desired probability from standard normal distribution table.
Converting 90 to z-score:
Now we are to find the probability of z score being more than 2.33. From the z-table the probability comes out to be 0.01.
Therefore, we can conclude that the probability of class average is greater than 90 is 0.01.
Answer: x = 27
Step-by-step explanation:
2x+3x+45=180º because all of the angles of a triangle add up to 180
5x=180-45
5x=135
x=135/5
x=27