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Paha777 [63]
3 years ago
13

What is the answer to this?

Mathematics
2 answers:
Alex3 years ago
8 0

Answer:

21

Step-by-step explanation:

bekas [8.4K]3 years ago
5 0

Answer:

21

Step-by-step explanation:

3 x 7 is 21

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If the length of rectangle is thrice of its breadth and it's perimeter is 32 cm then finds its area​.​
jeka57 [31]

Answer:

48 cm²

Explanation:

Let the breadth be b, then the length is 3b

P = 2(Length + Breadth)

32 = 2(3b + b)

32 = 2(4b)

8b = 32

b = 4

Breadth is 4 cm

Length: 3b = 3(4) = 12 cm

Area of rectangle:

Length × Breadth

12 × 4

48 cm²

3 0
1 year ago
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How many times does 4 go in 64
Afina-wow [57]

Answer:

Step-by-step explanation:

4 goes into 64 sixteen times. 64/4 = 16 16 x 4 = 64

7 0
2 years ago
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an aquarium tank is 3 feet long, 1 foot wide, and 2 feet high. how many gallons of water would it take to fill the tank two-thir
emmainna [20.7K]

Answer: the answer is 6ft


Step-by-step explanation:

3 times 1 times 2 = 6ft

7 0
3 years ago
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
“which of the <br> equations below could be the equation of this parabola?”
luda_lava [24]
The answer is C because it is on the x axis and it is positive
3 0
2 years ago
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