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2 years ago

URGENT HELP!!!!!!!!!!!!!!!!!!!!!!!!!!!!

Mathematics

2 answers:

kari74 [83]2 years ago

6 0

Answer: a=−2.3

a+0.3=-2 : a=-2.3

a+0.3=-2 = a=-2.3

Subtract 0.3 from both sides

a+0.3-0.3=-2-0.3

Simplify

a=-2.3

True [87]2 years ago

3 0

a+0.3=−2
a = - 2 - 0.3
a = - 2.3

answer is a. a=−2.3 first choice

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Answer:

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Step-by-step explanation:

System of Linear Equations entered :

[1] x + 3y = -18

[2] -x + 4y = -25

Graphic Representation of the Equations :

3y + x = -18 4y - x = -25

Solve by Substitution :

// Solve equation [1] for the variable x

[1] x = -3y - 18

// Plug this in for variable x in equation [2]

[2] -(-3y-18) + 4y = -25

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// By now we know this much :

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Answer:

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Step-by-step explanation:

we know that

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where

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{5 cm, 15 cm, 18 cm}

substitute in the formula

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therefore

Sean cannot make a right triangle with this set of lengths

case 2) we have

{6 cm, 12 cm, 16 cm}

substitute in the formula

$16^2=8^2+12^2$

$256=208$ ----> is not true

therefore

Sean cannot make a right triangle with this set of lengths

case 3) we have

{5 cm, 13 cm, 15 cm}

substitute in the formula

$15^2=5^2+13^2$

$225=194$ ----> is not true

therefore

Sean cannot make a right triangle with this set of lengths

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{8 cm, 15 cm, 17 cm}

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$17^2=8^2+15^2$

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therefore

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