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Anna [14]
3 years ago
7

Please help me look at the attached picture

Mathematics
1 answer:
Lady bird [3.3K]3 years ago
5 0

Answer:

Q(-10) = 299

Step-by-step explanation:

Q(x) = 3x^{2} - 1Q(-10) = 3(-10)^{2} - 1

Q(-10) = 3(100) - 1  (-10 to the second power is 100 (negative times a negative equals a positive)

Q(-10) = 300 - 1  3 times 100 equal 300

Q(-10) = 299

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Class A has 15 pupils and class B has 29 pupils.
Vaselesa [24]

The mean score (rounded to 2 DP) in the Math's test for class B is 86.86.

<h3>What is an equation?</h3>

An equation is an expression that shows the relationship between two or more numbers and variables.

Class A has 15 pupils and class B has 29 pupils. The mean score for class A is 55. Hence:

Mean score of A = (sum of all scores) / 15

55 =  (sum of all scores) / 15

sum of all scores in A = 825

The mean score for both classes is 76. Hence:

[(sum of all scores in A) + (sum of all scores in B)]/(total number of pupils) = mean score of both classes

[825 + (sum of all scores in B)]/(15 + 29) = 76

sum of all scores in B = 2519

Mean score of B = (2519) / 29 = 86.86

The mean score (rounded to 2 DP) in the Math's test for class B is 86.86.

Find out more on equation at: brainly.com/question/13763238

#SPJ1

6 0
1 year ago
there are 3 times as many adults as children at a book fair what is the ratio of people at the book fair​
kakasveta [241]

Answer:

1:3

Step-by-step explanation:

There are 3 adults per 1 child at the book fair. I think this is right but im not 100% sure :)

3 0
3 years ago
WILL GIVE BRAINLIEST HELP URGENT!!!
denis23 [38]

Answer:

Find like terms:

5x and 2x are like terms,

as well as:

42 and 1

do the math per usual but with the like terms:

5x - 2x = 3x

42 -1 = 41

Therefore your answer is:

(3x - 41)

(hope this helps)

8 0
3 years ago
Find the slope of (0, 4), (− 5, 2)
vredina [299]

Answer:

⅖ is the slope

Step-by-step explanation:

To find slope:

\frac{ {y}^{2} -  {y}^{1}  }{ {x}^{2} -  {x}^{1}  }

\frac{2 -4}{ - 5 - 0}

\frac{ - 2}{ - 5}

\frac{2}{5}

7 0
3 years ago
A 10 meter long wire is attached to the top of a flagpole 5√3 meters long. What is the measure of the angle the wire makes with
liberstina [14]
Well there has to be a right angle in there somewhere as the pole must be perpendicular to the ground.

Using the sine rule:
sinA/a = sinB/b where a = 10, A = 90, b = 5√3, B = B
Re-arrange for B, B = arcsin (b(sinA)/a)
B = arcsin(5√3(sin90)/10)
B = 60 degrees.

Answer is C
7 0
3 years ago
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