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3 years ago

8

Jacy has 20 marbles .One half of the marbles are red Two fifths are blue .The rest are green .How many marbles are green

2 answers:

Mama L [17]3 years ago

8 0

Answer:

2 are green

20× 1/2 =10

20×2/5=8

10+8=18

20-18=2

strojnjashka [21]3 years ago

3 0

2 of them are green.

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What is the standard deviation of the data set given below? 2,6,7,10,10

Masja [62]

Average = (2 + 6 + 7 + 10 + 10)/5 = 35/5 = 7

x - mean, square.

2 - 7 = -5, -5² = 25

<span>6 - 7 = -1, -1² = 1
</span>
<span>7 - 7 = 0, 0² = 0
</span>
<span>10 - 7 = 3, 3² = 9
</span>
<span>10 - 7 = 3, 3² = 9
</span>
Sum of square = 25 + 1 + 0 + 9 + 9 = 44

Variance = 44/5 = 8.8

Standard deviation = √variance = √8.8 ≈ 2.966

8 0

3 years ago

Here is rectangle QRST.

ValentinkaMS [17]

Answer:

QR = 5 units

RS = 10 units

Perimeter of QRST = 30 units

Step-by-step explanation:

The perimeter of a rectangle is given by the formula:

$p=2(l+w)$

where

$p$ is the perimeter of the rectangle

$l$ is the length of the rectangle

$w$ is the width of the rectangle

Now, to find the width, QR, and the length, RS, of the rectangle, we are using the distance formula:

$d=\sqrt{(x_2-x_1)^{2}+(y_2-y_1)^{2}}$

where

$d$ is the distance

$(x_1,y_1)$ are the coordinates of the first point

$(x_2,y_2)$ are the coordinates of the second point

- For QR:

The first point of QR is Q(-3, 0) and the second is R(0, 4), so $x_1=-3$ , $y_1=0$ , $x_2=0$ , and $y_2=4$ .

Replacing values

$d=\sqrt{(x_2-x_1)^{2}+(y_2-y_1)^{2}}$

$d=\sqrt{(0-(-3))^{2}+(4-0)^{2}}$

$d=\sqrt{(0+3)^{2}+(4)^{2}}$

$d=\sqrt{3^{2} +4^{2}}$

$d=\sqrt{9+16}$

$d=\sqrt{25}$

$d=5$

- For RS

The first point of RS is R(0, 4) and the second is S(8, -2), so $x_1=0$ , $y_1=4$ , $x_2=8$ , and $y_2=-2$ .

Replacing values

$d=\sqrt{(8-0)^{2}+(-2-4)^{2}}$

$d=\sqrt{(8)^{2}+(-6)^{2}}$

$d=\sqrt{64+36}$

$d=\sqrt{100}$

$d=10$

Now that we know that the width QR is 5 units and the length RS is 10 units, we can find the perimeter of our rectangle:

$p=2(l+w)$

$p=2(RS+QR)$

$p=2(10+5)$

$p=2(15)$

$p=30$

We can conclude that QR = 5 units, RS = 10 units, and the perimeter of rectangle QRST is 30 units.

3 0

3 years ago

Read 2 more answers

Shane's Mother is training for a marathon. On Saturdays, she runs 10 miles in 90 min. WHat is her average speed in miles per hou

Aleks04 [339]

<span>If someone runs 10 miles in 90 minutes their average speed is 6.67 mph</span>

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3 years ago

A football team gains 5 yards, then loses 2 yards, then gain another 6 yards, then loses 3 yards. What is their net gain or loss

const2013 [10]

Answer:

I believe it's 6 yards net gain

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3 years ago

Latoya earns $1.75 an hous for each child she baby-sits. How much does she earn if she baby-sits 3 children for 4 hours?

serious [3.7K]

Answer:

$21

Step-by-step explanation:

multiply 1.75 times 4, which is 7

then multiply 7 times 3, which is 21

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3 years ago