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arsen [322]
3 years ago
7

Is the square root of 1/4 a rational number

Mathematics
1 answer:
Mrrafil [7]3 years ago
3 0
Yes the square root of 1/4 is a rational number
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I need help! who ever get this right and explain nicely then I make you brainlist.
Lelechka [254]

Answer:

1. 64

2. 72 square feet

3. 31.5 square feet

Step-by-step explanation:

For the first one use the equation A=bh.

Plug in your values: A=12.8*5.

Solve: A=64

For the second one multiply 8*3 which gives you 24. Next multiply that by 3 to give you 72 square feet.

For the third one multiply 9 by 3.5 to get 31.5 square feet.

5 0
2 years ago
14. The area of a rectangle is 375 square inches and it’s perimeter is 80 inches. Find both the length and width.
Pavel [41]

Answer:

Length  =25 inches

Width = 15 inches

Step-by-step explanation:

Let l = length of rectangle, w = width of rectangle

Given the area and the perimeter of the rectangle, we can write:

lw = 375

2l+2w=80

So:

l+w = 80\div2

=40

l=40-w

Now, we can use substitution to find the value of w:

lw = 375

(40-w)w = 375

40w-w^2 = 375

375+w^2-40w = 0 (Quadratic equation)

(w-15)(w-25) = 0

∴ w = 15, 25

We can use substitution again to find the value of l

lw = 375

l=375\div w

=25,15

∵ Length usually refers to the longer side of a rectangle, ∴ length =25 inches and width =15 inches.

Hope this helps :)

8 0
2 years ago
What is the length of the missing leg? If necessary, round to the nearest tenth.
Lesechka [4]

<u>Answer:</u>

  • a = 7.4

<u>Step-by-step explanation:</u>

<u>We can find 'a' through Pythagoras theorem.</u>

  • => 8² = 3² + a²
  • => 64 = 9 + a²
  • => a² = 55
  • => a = √55
  • => a = 7.416 = 7.4

Hoped this helped.

BrainiacUser1357

3 0
2 years ago
Read 2 more answers
The seventh-grade class is building target areas for a PE activity. The bases for the game will be in a circular shape. The diam
lys-0071 [83]
By definition, the area of a circle is given by:
 A = \pi * r ^ 2&#10;
 Where,
 r: radius of the circle.
 Substituting the values in the given expression, we have:
 A = 3.14 * (3) ^ 2&#10;&#10; A = 28.26 feet ^ 2
 Rounding to the nearest tenth we have:
 A=28.3feet^2
 Answer:
 
Approximately needed:
 
A=28.3feet^2
4 0
3 years ago
Read 2 more answers
How can i solve by completing the square 4r^2-28r=-49
Natalija [7]
To complete the square, the second degree term must have a coefficient of 1.
Since the second degree term here has a coefficient of 4, we start by dividing each term on both sides by 4.

4r^2 - 28r = -49

\dfrac{4r^2}{4} - \dfrac{28}{4}r = -\dfrac{49}{4}

r^2 - 7r = -\dfrac{49}{4}

Now we can complete the square.
First, we need to find what number completes the square.
We take the coefficient of the first degree term, -7 in this case.
Divide it by 2 and square it. -7 divided by 2 is the fraction -7/2.
Now we square -7/2 to get 49/4.
We add 49/4 to both sides.

r^2 - 7r + \dfrac{49}{4} = -\dfrac{49}{4} + \dfrac{49}{4}

(r - \dfrac{7}{2})^2 = 0

r - \dfrac{7}{2} = 0

r = \dfrac{7}{2}
3 0
3 years ago
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