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4 years ago

What is 40% of $2.20...

2 answers:

6 0

100% ............. 2.20
40% ............. x
-----------------------------

x=40*2.20/100
x=88 / 100
x= 0.88

The answer is x=0.88

soldi70 [24.7K]4 years ago

5 0

Ok 40 of $2.20 is on ur calculator do 2.20 times 0.4 and u should get ur answer. 0.4 is 40% { Answer = 88 cents }

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General Formulas and Concepts:

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Order of Operations: BPEMDAS

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Addition Property of Equality
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Calculus

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Derivative of a constant is 0

Implicit Differentiation

Basic Power Rule:

f(x) = cxⁿ
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$\displaystyle \sqrt{x} - \sqrt{y} = -1$

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Step 2: Differentiate

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[Implicit Differentiation] Simplify Exponents: $\displaystyle \frac{1}{2}x^{\frac{-1}{2}} - \frac{1}{2}y^{\frac{-1}{2}}\frac{dy}{dx} = 0$
[Implicit Differentiation] Rewrite [Exponential Rule - Rewrite]: $\displaystyle \frac{1}{2x^{\frac{1}{2}}} - \frac{1}{2y^{\frac{1}{2}}}\frac{dy}{dx} = 0$
[Implicit Differentiation] Isolate y terms: $\displaystyle -\frac{1}{2y^{\frac{1}{2}}}\frac{dy}{dx} = -\frac{1}{2x^{\frac{1}{2}}}$
[Implicit Differentiation] Isolate $\displaystyle \frac{dy}{dx}$ : $\displaystyle \frac{dy}{dx} = \frac{2y^{\frac{1}{2}}}{2x^{\frac{1}{2}}}$
[Implicit Differentiation] Simplify: $\displaystyle \frac{dy}{dx} = \frac{y^{\frac{1}{2}}}{x^{\frac{1}{2}}}$

Step 3: Evaluate

Substitute in point [Derivative]: $\displaystyle \frac{dy}{dx} = \frac{(4)^{\frac{1}{2}}}{(1)^{\frac{1}{2}}}$
Exponents: $\displaystyle \frac{dy}{dx} = \frac{2}{1}$
Division: $\displaystyle \frac{dy}{dx} = 2$