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denis-greek [22]

3 years ago

6

Students wash cars to raise funds for class trips. The class made a profit of $326.60 from last Saturday’s car wash, which was 9

2% of its revenue. How much was the revenue(commission) for the car wash? (plsssssss answer someone)

1 answer:

vaieri [72.5K]3 years ago

4 0

Answer:627.072

Step-by-step explanation:

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Answer:

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Find the length of the tangent segment AB to the circles centered at O and O' whose radii are a and b respectively when the circ

bixtya [17]

Answer:

$AB=2\sqrt{ab}$

Step-by-step explanation:

From figure,

$OA=a, \quad \quad O'B=b\\\Rightarrow OO'= (a+b) \quad \quad \text{and}\quad OD=(a-b)$

In triangle $OO'D$

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$\Rightarrow (a+b)^2=(a-b)^2+(O' D)^2\\\Rightarrow a^2+b^2+2ab-a^2-b^2+2ab=(O' D)^2\\\Rightarrow 4ab=(O' D)^2\\\Rightarrow O'D=2\sqrt{ab} \\\Rightarrow O' D=2\sqrt{ab}=AB \quad \quad [\because O' DAB\;\; \text{is a rectangle.}]$

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