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3 years ago

Sheila walked 7.7 km to the library, if 1 mile = 1.6 km, about how many miles did she walk?

Mathematics

2 answers:

sweet [91]3 years ago

4 0

Answer:

it would be 5

Step-by-step explanation:

1.6 times 5 equals 8

wolverine [178]3 years ago

3 0

I’m not sure but it’s prob D

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What is the equation for the axis of symmetry of the graph of this function?

jolli1 [7]

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3 years ago

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1) The dimensions of an irregular solid are as shown in the figure below.

Juliette [100K]

Hello,

a) Volume of the figure = Volume of light blue rectangular parallelepiped - volume of dark blue rectangular parallelepiped

Volume of rectangular parallelepiped = lengh × high × height

Volume of light blue rectangular parallelepiped :

V = (x + 2) × (x + 5) × (2x + 1)

V = (x² + 5x + 2x + 10) × (2x + 1)

V = (x² + 7x + 10) × (2x + 1)

V = 2x³ + 15x² + 27x + 10

Volume of dark blue rectangular parallelepiped :

V = x × 3 × (x + 5)

V = 3x(x + 5)

V = 3x² + 15x

Polynomial function, in standard form, to model the volume of this solid :

V = 2x³ + 15x² + 27x + 10 - (3x² + 15x)

V = 2x³ + 15x² - 3x² + 27x - 15x + 10

V = 2x³ + 12x² + 12x + 10

b) We have to solve 2x³ + 12x² + 12x + 10 = 208

⇔ 2x³ + 12x² + 12x - 198 = 0

⇔ 2(x - 3)(x² + 9x + 33) = 0

⇔ x = 3 or x² + 9x + 33 = 0

a = 1 ; b = 9 ; c = 33

Δ = b² - 4ac = 9² - 4 × 1 × 33 = -51 < 0 ⇔ Δ < 0 ⇒ no solution

So if the volume of the solid is 208 cubic inches, the value of x is 3

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2 years ago

Is 0.345 repeating rational or irrational

Korolek [52]

I believe it is rational

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mylen [45]

The slope of the line is
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3 years ago

The price of a smart watch is $109.99 and the sales tax is 6.5%. What is the total cost of the smart watch? Enter your answer in

ololo11 [35]

Answer:

$117.14

Step-by-step explanation:

A "sales tax" refers to a specific amount of money (according to its percentage) that you need to pay other than the price of the good stated.

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In order to know the total cost of the smart watch, you have to add the sales tax to the price of the smart watch.

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