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just olya [345]
3 years ago
6

If the sum of two real number is 21, what is the greatest possible value of their product

Mathematics
1 answer:
Softa [21]3 years ago
4 0

Answer:

Step-by-step explanation:

let th numbers be x and y.

x+y=21

y=21-x

Product P=xy=x(21-x)=21 x-x^2

P'=21-2x

P'=0 gives 21-2x=0,x=21/2

P"=-2

which is less than 0 at x=21/2

so P is greatest at x=21/2

y=21-21/2=21/2

P=21/2 ×21/2=441/4=110.25

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ddd [48]
If the number of adult tickets are taken as x then the number of children’s tickets can be taken as (89 — x ) then we can set up the equation

4.10(x) + 2.70 (89 — x) = 331.30
4.10x + 240.3 — 2.70x = 331.30
1.4x = 331.30 — 240.30
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Therefore 65 adult tickets and 24 children tickets as 89 — 65 is 24
5 0
3 years ago
The picture explains it
Vsevolod [243]

Answer:

60

Step-by-step explanation:

you know that if one line is perpendicular to another line, and another line is perpendicular to that line, they are all perpendicular (90). so, all corners are right angles. that means that angle AGD is 90. so, if you know 30, then subtract 30 from 90 and you get that angle AGF is 60. then, because angle AGF and angle EGB are vertical angles, they are congruent, so x is 60.

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3 years ago
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PIT_PIT [208]

Answer:

(-2, -9)

explanation:

original coordinates of B: (7, 9)

use the formula: (x, y) ---> (x, -y)

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If horizontally shifted there will be change in x axis,

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3 years ago
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Answer:

-1/3

Step-by-step explanation:

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Answer:

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Step-by-step explanation:

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3 years ago
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