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3 years ago

14

A screwdriver is 20 centimeters long, and a piece of wire is 10 millimeters long. The screwdriver is how many times as long as t

he wire?

2 answers:

valentinak56 [21]3 years ago

6 0

The screwdriver is 2 times as long as the wire

Maurinko [17]3 years ago

4 0

Answer:

the answer is 20

Step-by-step explanation:

ttm

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2 years ago

What is f(x) = 7x2 + 42x written in vertex form?

amid [387]

Answer:

$\boxed{\boxed{y = 7(x+3)^2-63}}$

Step-by-step explanation:

The general vertex form of parabola is,

$y=a(x-h)+k$

where,

(h, k) is the vertex of the parabola.

The given function is,

$\Rightarrow f(x) = 7x^2 + 42x$

$\Rightarrow y = 7x^2 + 42x$

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$\Rightarrow y = 7(x^2 + 2\cdot x\cdot 3)$

$\Rightarrow y = 7(x^2 + 2\cdot x\cdot 3+3^3-3^2)$

$\Rightarrow y = 7(x^2 + 2\cdot x\cdot 3+3^3)-7\cdot 3^2$

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$\Rightarrow y = 7(x+3)^2-63$

This is vertex form the given function.

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