2 years ago

2. A shoreline is eroding at a rate of 3 foot per 3 months. How many feet are eroding pet

1 answer:

3 0

3 months happens 4 times in a year, and so does the 1/3 foot of erosion. 4 times 1/3 foot = 4/3 feet. That's 1-1/3 feet, or 1 foot 4 inches.

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4) A window is in the form of a rectangle surmounted by a semicircle. The rectangle is of clear glass, whereas the semicircle is

lisov135 [29]

Answer:

l=0.1401P\\

w =0.2801P

where P = perimeter

Step-by-step explanation:

Given that a window is in the form of a rectangle surmounted by a semicircle.

Perimeter of window =2l+\pid/2+w

$P= 2l+3.14 (w/2)+w$

Or $P = 2l+2.57w\\l = \frac{P-2.57w}{2}$

To allow maximum light we must have maximum area

Area = area of rectangle + area of semi circle where rectangle width = diameter of semi circle

$A=lw +\pi \frac{w^2}{8}$

$A=lw +\pi \frac{w^2}{8}\\A=w*\frac{P-2.57w}{2}+0.3925w^2\\2A= Pw-2.57w^2+(0.785w^2)\\2A' = P-5.14w+1.57 w\\2A" =-5.14+1.57$

Hence we get maximum area when i derivative is 0

i.e. $P-5.14w+1.57 w=0\\3.57w =P\\w = \frac{P}{3.57} =0.2801P$

$l = \frac{P-2.57w}{2}\\l = 0.1401P$

Dimensions can be

$l=0.1401P\\w =0.2801P$

5 0

2 years ago

I need help with this rq

Vesnalui [34]

Answer:

228.4

Step-by-step explanation:

9.2 + 9.2 + 60 + 75 +75 which is 228.4. Remember to divide the triangles by two after you do base times height.

7 0

2 years ago

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(3x+6) 2 is subtracted from 9?

vovikov84 [41]

Where did the 9 and 2 come from

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3 years ago

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How many milliliters equal 1942 cm?

stiks02 [169]

1cm³=1mL
1942cm=x mL

1cm³ 1942cm³
________ = ________
1mL x mL

Cross multiply
1x=1942
divide both sides by 1
x=1942mL

Answer=1942mL

8 0

2 years ago

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Solve −3x+5<17 <br><br> If someone could do this fast it would really help!

miss Akunina [59]

Answer:

x>-4

Step-by-step explanation:

-3x<12

x>-4

8 0

2 years ago