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borishaifa [10]
3 years ago
14

C = grocery store charges

Mathematics
1 answer:
denpristay [2]3 years ago
8 0
B because it is in the 10ths place
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I’m so sry but can‘t understand it has to be 4/15 7/15 or 2/3.

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What is the answer for -2(u+1)-5
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Step-by-step explanation:

-2(u+1)-5 = -2*u + (-2)* 1 - 5

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You can see that the MNO triangle is similar to MKL  then  \displsystyle\   \frac{NO}{KL} =\frac{x}{ML}  =>  \frac{12}{22} =\frac{x}{27,5} => x=\frac{12\cdot 27,5}{22} =15                                                                  \displaystyle\ Answer: \boxed{x=15}

 

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4 years ago
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In a GP, the sixth term is eight times the tenth term. The sum of the seventh and the eighth term is 192. Find the common ratio
liubo4ka [24]

Let <em>a</em>(<em>n</em>) denote the <em>n</em>-th term in the GP. We're given

<em>a</em>(6) = 8<em>a</em>(10)

<em>a</em>(7) + <em>a</em>(8) = 192

In a geometric progression, consecutive terms are scaled up or down by a fixed ratio <em>r</em> such that

<em>a</em>(<em>n</em>) = <em>r</em> <em>a</em>(<em>n</em> - 1)

By substitution, we get

<em>a</em>(<em>n</em>) = <em>r</em> (<em>r</em> <em>a</em>(<em>n</em> - 2)) = <em>r</em> ² <em>a</em>(<em>n</em> - 2)

and we can continue the pattern down to the first term,

<em>a</em>(<em>n</em>) = <em>r</em> <em>a</em>(<em>n</em> - 1) = <em>r</em> ² <em>a</em>(<em>n</em> - 2) = <em>r</em> ³ <em>a</em>(<em>n</em> - 3) = … = <em>rⁿ </em>⁻¹ <em>a</em>(1)

So we can rewrite the first two equations in terms of the first term of the GP <em>a</em>(1) and the common ratio <em>r</em> :

<em>r</em> ⁵ <em>a</em>(1) = 8<em>r</em> ⁹ <em>a</em>(1)

<em>r</em> ⁶ <em>a</em>(1) + <em>r</em> ⁷ <em>a</em>(1) = 192

Solve the first equation for <em>r</em> :

<em>r</em> ⁵ <em>a</em>(1) = 8<em>r</em> ⁹ <em>a</em>(1)   →   1 = 8<em>r</em> ⁴   →   <em>r</em> = 1/∜8 ≈ 0.5946

Solve the second equation for <em>a</em>(1) :

<em>r</em> ⁶ <em>a</em>(1) + <em>r</em> ⁷ <em>a</em>(1) = <em>r</em> ⁶ <em>a</em>(1) (1 + <em>r</em> ) = 1/(16√2) <em>a</em>(1) (1 + 1/∜8) = 192

→   <em>a</em>(1) = 6144 ∜2 / (1 + ∜8) ≈ 2724.48

6 0
3 years ago
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