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3 years ago

Please help me on this question?!!!!!

Mathematics

2 answers:

kvv77 [185]3 years ago

6 0

Answer:

shop B, Aisha she buy a paint because of low price compare to shop A

vitfil [10]3 years ago

5 0

Answer:

Aisha should buy from shop B

Step-by-step explanation:

Cost of 1 tin in shop A = 23.40÷5

= 4.68

Cost of 1 tin in shop B = 14.01÷3

= 4.67

Therefore, Aisha should buy from shop B because the cost per tin is lower than shop A.

Hope it helps. :)

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Solve by completing a square r^2-8r+9

Tanzania [10]

Solving $r^2-8r+9$ by completing a square gives $(r+4)^2-7$

Step-by-step explanation:

We need to solve the equation $r^2-8r+9$ by completing a square

The completing a square method requires: $a^2\pm 2ab +b^2=(a\pm b)^2$

Solving:

$r^2-8r+9\\=(r)^2-2(r)(?)+(?)^2+9$

We need to add and subtract (4)^2=16 to make the equation a complete square

$=(r)^2-2(r)(4)+(4)^2-(4)^2+9\\=(r)^2-2(r)(4)+(4)^2-16+9\\=(r)^2-2(r)(4)+(4)^2-7\\=(r+4)^2-7$

So, Solving $r^2-8r+9$ by completing a square gives $(r+4)^2-7$

Keywords: Solve by completing a square

Learn more about Solve by completing a square at:

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Answer:

Step-by-step explanation:

24-3+(2x5)=31

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