Help me 3×(x-y)-7(y-x)²

Mathematics

1 answer:

forsale [732]3 years ago

6 0

Answer:

${ \tt{3(x - y) - 7 {(y - x)}^{2} }} \\ \\\dashrightarrow \: { \tt{3(x - y) - 7(y - x)(y - x)}} \\ \\ \dashrightarrow \: { \tt{3x - 3y - 7 {y}^{2} + 14xy - 7 {x}^{2} }} \\ \\ \dashrightarrow \: { \tt{ - 7( {x}^{2} + {y}^{2}) + 14xy + 3x - 3y }} \\ \\ \dashrightarrow \: { \tt{ - 7 \{ {(x + y)}^{2} - 2xy \} + 14xy + 3x - 3y}} \\ \\ \dashrightarrow \: { \tt{7 {(x + y)}^{2} + 12xy + 3x - 3y }}$

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A box of 25 munchkins cost $5.46 what is the unit rate per munchkin

timurjin [86]

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<h3>What is Division?</h3>

Division is one of the four fundamental arithmetic operations, which tells us how the numbers are combined to form a new one.

The cost of 25 munchkins cost $5.46, therefore, the unit rate of each munchkin can be written as,

$\text{Cost of unit munchkin} = \dfrac{\text{Total cost of munchkins}}{\text{Number of munchkins}}\\\\\text{Cost of unit munchkin} = \dfrac{\$5.46}{25}=\$0.2184 \approx \$0.22$