What are the solutions to the equation?

Mathematics

2 answers:

nydimaria [60]3 years ago

5 0

Answer: The correct answer would be x=-5 and 3

Step-by-step explanation:

denis23 [38]3 years ago

4 0

Answer:6.5

Step-by-step explanation: If you simplify (3 x 2) into 6, it will leave 6+6x=45. So if you subtract 6 on both sides it will cancel out the one on the left and make 45 into 39. So now you have 6x=39 so now you just divide 6 on both sides and get 6.5.

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An English professor assigns letter grades on a test according to the following scheme. A: Top 15% of scores B: Scores below the

lisabon 2012 [21]

Answer:

59 to 66

Step-by-step explanation:

Mean test scores = u = 74.2

Standard Deviation = $\sigma$ = 9.6

According to the given data, following is the range of grades:

Grade A: 85% to 100%

Grade B: 55% to 85%

Grade C: 19% to 55%

Grade D: 6% to 19%

Grade F: 0% to 6%

So, the grade D will be given to the students from 6% to 19% scores. We can convert these percentages to numerical limits using the z scores. First we need to to identify the corresponding z scores of these limits.

6% to 19% in decimal form would be 0.06 to 0.19. Corresponding z score for 0.06 is -1.56 and that for 0.19 is -0.88 (From the z table)

The formula for z score is:

$z=\frac{x-u}{\sigma}$