3 years ago

NEED HELP ASAP WILL GIVE BRAINLY

Mathematics

1 answer:

Alenkasestr [34]3 years ago

7 0

Answer:

Step-by-step explanation:

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the frame of a picture is 28 cm by 32 cm outside and is of uniform width.What is the width of the frame if 192 cm2 of the pictur

natita [175]

Answer:

The width of the frame is equal to $8\ cm$

Step-by-step explanation:

Let

x-------> the width of the frame picture

we know that

$(28-2x)(32-2x)=192$

$896-56x-64x+4x^{2} =192$

$4x^{2}-120x+704=0$

Simplify

$x^{2}-30x+176=0$

The formula to solve a quadratic equation of the form $ax^{2} +bx+c=0$ is equal to

$x=\frac{-b(+/-)\sqrt{b^{2}-4ac}} {2a}$

in this problem we have

$x^{2}-30x+176=0$

$a=1\\b=-30\\c=176$

substitute in the formula

$x=\frac{30(+/-)\sqrt{(-30)^{2}-4(1)(176)}} {2(1)}$

$x=\frac{30(+/-)\sqrt{196}} {2}$

$x=\frac{30(+/-)14} {2}$

$x=\frac{30+14} {2}=22\ cm$ ----> this solution is not logic

$x=\frac{30-14} {2}=8\ cm$

The width of the frame is equal to $8\ cm$

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3 years ago

Please helpppppppppppppppppppp meeeeeeeeeeeeeeeeeeeeee

DaniilM [7]

Answer:1 page

Step-by-step explanation:

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SOVA2 [1]

40% of 210 is 525, and 1/4 of 210 is 52.5, so the answer is 40% of 210 > 1/4 of 210.

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Heights in inches of several tomato plants : 16,18,18,20,17,10,18,17 mean absolute deviation :

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It would be 12...

Step-by-step explanation:

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