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3 years ago

Decrease 20 sec by 20%

1 answer:

4 0

Answer: 16 seconds
To decrease it by 20% percent,
We need to first find amount by:
=20*100/20
=4
Therefore 20% of 20 second is 4 seconds
Now let’s decrease it:
20-4
16
Therefore we get 16 second by decreasing 20% of 20 seconds

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On a coordinate plane, a line goes through points (0, 0) and (1, 3).

gtnhenbr [62]

Answer:

3 on edge

Step-by-step explanation:

Just did the assignment

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3 years ago

A farmer wants to make a rectangular field with a total area of 800m2. It is surrounded by a fence. It is divided into 3 equal a

Vlad1618 [11]

<span>This is a rectangular field, it will have four fence in one direction, and two in the other. The vertical lines here are the same length on each other, likewise of the horizontal line.We can calculate the length of the fence from them as: 4V + 2H= L we also have three area added together come to 800: 3VH = 800 so, lets re-arrange that second equation H=800/3V And sub into the first: 4V + 1600/3V = L Multiply through by 3V: 12V^2+1600= 3LV Rearrange 12V^2 - 3LV+ 1600= 0 we have quadratic, lets take a look at discriminant with this quadratic discriminant= b^2 - 4ac discriminant= 9L^2 - 4*12*1600 discriminant= 9L^2 - 76800 the dicriminant must be positive so the following must be true 9L^2>=76800 L^2>=8533.33 L>=92.376 so 92.36 is answer</span>

8 0

3 years ago

A company manufactures cell phones. In August, a random sample of 125 cell phones was inspected, and 3 phones were found to be d

german

Answer:

192

Step-by-step explanation:

To find how many phones are expected to be defective, we need to represent the values in a fraction.

$\dfrac{x}{8000}=\dfrac{3}{125}$

x = number of defective phones

Now we can solve this using algebra.

To get the value of x we need to multiply both sides by 8000 to leave x alone.

$x=\dfrac{3}{125}(8000)$

$x=0.024(8000)$

$x=192$

So around 192 cell phones are expected to be defective out of 8000 phones.

6 0

4 years ago

A plot of land is a pentagon with vertices Q(-4, 4), R(2, 4), S(4, 1), T(2, -4), and U(-4, -4).

My name is Ann [436]

The measure of QR is 6 units, which is 6 meters, since every unit on the coordinate grid is 1 meter.
The measure of UT is also 6 meters.
The measure of QU is 8 meters.
To find the measure of RS, we use the distance formula:
$\sqrt{(x_{2}-x_{1})^2 + (y_{2}-y_{1})^2}$
We substitute the coordinates of R and S into the formula and have:
$\sqrt{(2-4)^2+(4-1)^2} \\ =\sqrt{(-2)^2 + (3)^2} \\ =\sqrt{4+9} \\=\sqrt{13} \\=3.61$
To find the measure of ST we use the distance formula again, substituting the coordinates for S and T into the formula:
$\sqrt{(4-2)^2+(1--4)^2} \\=\sqrt{(2)^2 + (1+4)^2} \\=\sqrt{4+5^2} \\=\sqrt{4+25} \\=\sqrt{29} = 5.39$
Now we find our perimeter by adding the sides together: 5.39 + 3.61 + 6 + 6 + 8 = 29 meters
Since fencing costs $24.75 per meter, we multiply this by our perimeter:
29(24.75) = $717.75

8 0

3 years ago

PLSSS HELP WILL MARK BRANLIEST!!

insens350 [35]

Answer:

Step-by-step explanation:

the final answer after multiplying them all is 2ax^2, but since its a triangle you multiply that by 1/2 to get ax^2

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3 years ago