Rationalizing the denominator involves exploiting the well-known difference of squares formula,
We have
so that
Rewrite 16 and 32 as powers of 2, then simplify:
So we have <em>A</em> = 8, <em>B</em> = 2, <em>C</em> = 4, and <em>D</em> = 7, and thus <em>A</em> + <em>B</em> + <em>C</em> + <em>D</em> = 21.
3 gallons because 3/4 of a gallon covers 1/4 of a wall so you multiply the amount of gallons used for a wall times 4 which is 12/4 (keep the denominator the same ) and then divide 12 by 4 which is 3 gallons
The answer is: [B]: " 3.99 * 10⁻⁶ " .
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Note:
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We are given the following answer choices, and we are asked which one is the "smallest number" :
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[A]: 4.4 * 10⁻⁵
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[B]: 3.99 ⋅ 10⁻⁶
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[C]: 2.6 ⋅ 10²
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[D]: 1.85 ⋅ 10³
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We can rule out answer choices: [C] and [D]; since these values, essentially "direct us" to move the decimal point FORWARD "2 places" and "3 places", respectively; whereas choices [A] and [B] essentially "direct us" to move the decimal point BACKWARD "5 places" and "6 places" respectively. Note that all values given in the answer choices are written in proper "scientific notation" —that is, beginning with a "single integer followed by (a) decimal point(s) and then additional digits (when needed). So, the answer choice that essentially "directs us" to move the decimal point BACKWARD "6 places" —
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→ Answer choice: [B]: " 3.99 * 10⁻⁶ " ;
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is the smallest value ; and as such, the correct answer.
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Chocolate- 20×.5= 10 Vanilla-20×.25=5 Strawberry- 20×.25=5 10+5+5=20
