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3 years ago

.2 to the 5th power

Mathematics

1 answer:

Aleonysh [2.5K]3 years ago

7 0

Answer: The correct answer is:

____________________________________________

→ " 0.00032 " ; or, write as: " $\frac{1}{3125}$ " .

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Step-by-step explanation:

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Method 1)

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(0.2)⁵ = ? ;

Note: " 0.2 " = 2/10 = (2÷2) / (10÷2) = 1/5 .

→ (0.2)⁵ = (1/5)⁵ = (1⁵) / (5)⁵ = ? ;

Note: 1⁵ = 1 × 1 × 1 × 1× 1 = 1 ;

Note: 5⁵ = 5 × 5 × 5 × 5 × 5 ;

= (5 × 5) × 5 × 5 × 5 ;

= (25) × 5 × 5 × 5 ;

= (25 × 5) × 5 × 5 ;

= 125 × 5 × 5 ;

= (125 × 5) * 5 ;

= (625 ) × 5 ;

= 3125 .

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→ (0.2)⁵ = (1/5)⁵ = (1⁵ / 5⁵) = $\frac{1}{3125}$ .

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Method 2)

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(0.2)⁵ = 0.2 × 0.2 × 0.2 × 0.2 × 0.2 ;

= (0.2 × 0.2) × 0.2 × 0.2 × 0.2 ;

= (0.04) × (0.2) × (0.2) × (0.2) ;

= (0.04 * 0.2) × 0.2 × 0.2 ;

= (0.008) × 0.2 × 0.2 ;

= (0.008) × (0.2 × 0.2) ;

= (0.008) × (0.04) ;

(0.2)⁵ = 0.00032

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Now, just for curiosity, let us see if the values obtained using

both "Method 1" and "Method 2" are equal:

$\frac{1}{3125}$ =? 0.00032 ?? ;

→ (1 ÷ 3125) =? 0.00032 ?? ; Yes!

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Also, check work using calculator:

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(0.2)⁵ = 0.00032 . Yes!

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The correct answer is:

____________________________________________

" 0.00032 " ; or, write as: " $\frac{1}{3125}$ " .

____________________________________________

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gayaneshka [121]

Answer:

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Step-by-step explanation:

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7 0

3 years ago

Bill and Mary Ann went to the Viola bakery. Bill bought 5 pies and 7 donuts for $12.65. Mary Ann bought 6 of each for $12.30.

sweet [91]

Answer:

Pies=$0.85

Donuts= $1.20

Step-by-step explanation:

In the equation let p stand for the number of pies and d stand for the number of donuts.

To solve this set up 2 equations, one representing bill and the other representing Mary Ann.

Bill's equation is 5p+7d=$12.65.
Mary Ann's equation is 6p+6d=$12.30

Then solve using a system of equations. Systems of equations can be solved using elimination or substitution. I will use substitution. Solve bill's equation for p. This gives you $p=\frac{12.65-7d}{5}$ . Then, you can substitute that into Mary Ann's equation. This looks like $6\cdot \frac{12.65-7d}{5}+6d=12.3$ . Solve for d. Once you solve d=1.20. Finally, substitute 1.20 back into either Bill's or Mary Ann's for d and solve for p. No matter which equation you use p=0.85.