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ratelena [41]
2 years ago
9

HELP PLEASE ILL MAKE YOU BRILLIANT !?!

Mathematics
1 answer:
Fed [463]2 years ago
7 0

Answer:

For #7:

B= 506

C=25

D=792

For #8:

She would drive 385 miles

For #9:

He used 2.25 or 2 1/4 cups per batch

For #10:

She will have to mow 13 lawns.

For #11:

PART A:

The first box would be 0.5

The third box would be 40

The fourth box would be 3.5

PART B: You'll have to do that yourself now that you have to times.

PART C: She rode 20 kph

Really hoped this helped!!! Have a great night and Happy Thanksgiving :)

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Express 0.000000015 in scientific notation
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Write y=-3(x-7)^2-8 in vertex form
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Find the measurements (the length L and the width W) of an inscribed rectangle under the line with the 1st quadrant of the x &am
Leni [432]

The question is incomplete. Here is the complete question.

Find the measurements (the lenght L and the width W) of an inscribed rectangle under the line y = -\frac{3}{4}x + 3 with the 1st quadrant of the x & y coordinate system such that the area is maximum. Also, find that maximum area. To get full credit, you must draw the picture of the problem and label the length and the width in terms of x and y.

Answer: L = 1; W = 9/4; A = 2.25;

Step-by-step explanation: The rectangle is under a straight line. Area of a rectangle is given by A = L*W. To determine the maximum area:

A = x.y

A = x(-\frac{3}{4}.x + 3)

A = -\frac{3}{4}.x^{2}  + 3x

To maximize, we have to differentiate the equation:

\frac{dA}{dx} = \frac{d}{dx}(-\frac{3}{4}.x^{2}  + 3x)

\frac{dA}{dx} = -3x + 3

The critical point is:

\frac{dA}{dx} = 0

-3x + 3 = 0

x = 1

Substituing:

y = -\frac{3}{4}x + 3

y = -\frac{3}{4}.1 + 3

y = 9/4

So, the measurements are x = L = 1 and y = W = 9/4

The maximum area is:

A = 1 . 9/4

A = 9/4

A = 2.25

6 0
3 years ago
Nancy is knitting a scarf. It takes her 0.2 of an hour to knit each inch of the scarf. She wants the length of the scarf to be 6
ehidna [41]

Answer:

2 hours

Step-by-step explanation:

60 *20

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3 years ago
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