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makkiz [27]
3 years ago
15

If 35% of the 300 students in 6th grade have an older brother or sister, how many 6th graders have an older sibling? To solve th

is problem, we can write and then create v 6th graders have an older brother or sister.​
Mathematics
2 answers:
kirza4 [7]3 years ago
8 0

Answer:

105 students

Step-by-step explanation:

lana66690 [7]3 years ago
4 0

Answer:

105

Step-by-step explanation:

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2x + y = 3 x - 2y = -1 If equation two is multiplied by -2 and then the equations are added, the result is what?
photoshop1234 [79]

Answer:

  1. 2x + y
  2. 3 x - 2y
  3. -1

2(3 x - 2y) = -6x + 4y

2x + y + -6x + 4y + -1 = -4x + 5y -1

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If the altitude of an isosceles right triangle has a length of x units, what is the length of one leg of the large right triangl
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A biology test is worth 100 points and has 36 questions.
Ad libitum [116K]

Answer:

(a) 7 essays and 29 multiple questions

(b) Your friend is incorrect

Step-by-step explanation:

Represent multiple choice with M and essay with E.

So:

M + E= 36 --- Number of questions

2M + 6E = 100 --- Points

Solving (a): Number of question of each type.

Make E the subject of formula in M + E= 36

E = 36 - M

Substitute 36 - M for E in 2M + 6E = 100

2M + 6(36 - M) = 100

2M + 216 - 6M = 100

Collect Like Terms

2M - 6M = 100 - 216

-4M = - 116

Divide both sides by -4

M = \frac{-116}{-4}

M = 29

Substitute 29 for M in E = 36 - M

E = 36 - 29

E = 7

Solving (b): Can the multiple questions worth 4 points each?

It is not possible.

See explanation.

If multiple question worth 4 points each, then

2M + 6E = 100 would be:

4M + xE = 100

Where x represents the number of points for essay questions.

Substitute 7 for E and 29 for M.

4 * 29 + x * 7 = 100

116 + 7x = 100

Subtract 116 from both sides

116-116 + 7x = 100 -116

7x = 100-116

7x = -16

Make x the subject

x = -\frac{16}{7}

Since the essay question can not have worth negative points.

Then, it is impossible to have the multiple questions worth 4 points

<em>Your friend is incorrect.</em>

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2 years ago
What is 20.30 - 19.70 and what are the solving steps?
DIA [1.3K]

Answer

0.6

Step-by-step explanation:

here is the working out! Can i get brainliest

5 0
3 years ago
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. A car goes from 0 to 100 km/hr in 10 seconds. What is its acceleration? 
Ugo [173]
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