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enyata [817]
3 years ago
9

Expand the expression and combine like terms: 4(1.75y−3.5)+1.25y

Mathematics
1 answer:
Bas_tet [7]3 years ago
8 0
4(1.75y−3.5)+1.25y . First multiply through with 4 the numbers in the parentheses. 7y➖ 14 ➕ 1.25y add 1.25y to 7y That will be 8.25y So the answer will be 8.25y ➖ 14
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The table shows a basketball player score in 5 Games how many points must the basketball players score in the next game to achie
bogdanovich [222]

Answer:

You would have to score 17 points.

Step-by-step explanation:

13x6=78 is the points you have to reach to get 13 points per game.

Add up all numbers, which is 61.

78-61=17

That is your answer.

3 0
3 years ago
At Hogwarts School of Witchcraft and Wizardry, Professor Snape was concerned about grade inflation, and suggested that the schoo
ExtremeBDS [4]

Answers:

The z scores are approximately:

  • Care of Magical Creatures:  z = 0.333
  • Defense Against the Dark Arts:  z = 0.583
  • Transfiguration:  z = -0.263
  • Potions: z = -0.533

From those scores, we can say:

  • Best grade = Defense Against the Dark Arts
  • Worst grade = Potions

=====================================================

Further Explanation:

We'll need to convert each given score to a corresponding standardized z score.

The formula to use is

z = (x - mu)/sigma

where,

  • x = given grade for each class
  • mu = mean
  • sigma = standard deviation

Let's find the z score for the Care of Magical Creatures class

z = (x - mu)/sigma

z = (3.80 - 3.75)/(0.15)

z = 0.333 approximately

Repeat this process for the Defense Against the Dark Arts score.

z = (x - mu)/sigma

z = (3.60 - 3.25)/(0.60)

z = 0.583 approximately

And for the Transfiguration class as well

z = (x - mu)/sigma

z = (3.10 - 3.20)/(0.38)

z = -0.263 approximately

The negative z score means his grade below the average, whereas earlier the other scores were above the average since he got positive z scores.

Now do the final class (Potions) to get this z score

z = (x - mu)/sigma

z = (2.50 - 2.90)/(0.75)

z = -0.533 approximately

This grade is below average as well.

----------------------------

To summarize, we have these z scores

  • Care of Magical Creatures:  z = 0.333
  • Defense Against the Dark Arts:  z = 0.583
  • Transfiguration:  z = -0.263
  • Potions: z = -0.533

Harry did his best in Defense Against the Dark Arts because the z score of 0.583 (approximate) is the largest of the four z scores. On the other hand, his worst grade is in Potions because -0.533 is the lowest z score.

3 0
1 year ago
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Answer:

Step-by-step explanation:

Perimeter = 4c + 9 + 7c - 5 + 5c + 2 + 5c - 3

                = 4c +7c + 5c +5c + 9 - 5 + 2  - 3

                 = 21c + 3

7 0
2 years ago
In a stack of boards at a lumber yard, the 20th board counting from the top of the stack is immediately below the 16th board cou
Novosadov [1.4K]

Answer:

C

Step-by-step explanation:

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Solve by factorising x2+8x+15=0
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Answer:

Hi! The correct answer is x= -3 ,-5!

Step-by-step explanation:

<em>~Factor and set each factor equal to 0~</em>

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Read 2 more answers
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