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Dafna11 [192]
2 years ago
13

Lisa's test grades are 79, 89 and 90

Mathematics
2 answers:
eimsori [14]2 years ago
7 0
  • Mean=Sum of data/No of data

So

Let that be n

  • n+79+89+90/4=88
  • n+258/4=88
  • n+258=352
  • n=94
Vaselesa [24]2 years ago
6 0

Answer:

<u>94</u>

Step-by-step explanation:

Equating the mean to the scores :

  • 88 = 79 + 89 + 90 + x / 4
  • 352 = 258 + x
  • x = <u>94</u>
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x° = 14°, y° = 14°; Use vertical and supplementary angles.

Step-by-step explanation:

The image of the answer is attached below.

In the given image two lines are parallel with transversal.

(9x + 12)° and ∠1 are vertically opposite angles.

Vertically opposite angles are equal.

∠1 = (9x + 12)°

Consecutive interior angles are supplementary.

(9x + 12)° + 3x° = 180°

⇒ 12x° = 168°

⇒ x° = 14°

Sum of the adjacent angles in a line are supplementary.

3x° + (4y – 10)° = 180°

⇒ 3(14)° + 4y° – 10° = 180°

⇒ 4y° = 148°

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Hence, x° = 14°, y° = 14°; Use vertical and supplementary angles.

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Step-by-step explanation:

Here is the complete question:

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