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3 years ago

Class A has 26 pupils and class B has 15 pupils.

Mathematics

2 answers:

Troyanec [42]3 years ago

8 0

Answer:

It's 49.4

Step-by-step explanation:

((26*33)+(15*x))/41＝39

((858)+(15*x))/41＝39 ‖*41

(858)+(15*x)＝1599 ‖-858

15*x＝741 ‖/15

x＝49.4

lubasha [3.4K]3 years ago

4 0

Answer:

Concept: Real World Analysis

So we know A has an average of 33
We know A+B/2= 39
Hence we will solve for b
$\frac{33 + x}{2} = 39$
$x = 45$

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3 years ago

The height of a triangle is 5 cm shorter than its base. If the area of the triangle is 25 cm2, find the height of the triangle.

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Answer:

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Step-by-step explanation:

Let's call B at the base of the triangle and call h at the height of the triangle. Then we know that:

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$h = B-5$ .

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$A = 0.5Bh$

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In this case note that: $a=0.5,\ \ b=-\frac{5}{2}\ \ c=-25$

Then:

$B=\frac{-(-\frac{5}{2})\±\sqrt{(-\frac{5}{2})^2-4(0.5)(-25)}}{2(0.5)}$

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3 years ago

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ANSWER

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That is the value of x.

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1 year ago

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3 years ago

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3 years ago