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3 years ago

Help and explain!!!!!!!!

Mathematics

1 answer:

gregori [183]3 years ago

4 0

W=12.5c+39.2

Her collection already has a weight of 39.2 g so you must add that to every new car bought each with a weight of 12.5 g.

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Kathryn bought five CDs. A week later half of all her CDs were lost during a move. There are now only 16 CDs left. With how many

yan [13]

She started off with 11

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3 years ago

Fifteen sprinters ran the 50-yard dash in an average of 9.5 seconds. Of those runners,3 ran the dash in 11.5 seconds. Find the a

dezoksy [38]

There might be a variety of averages for the 12 boys.

3 0

3 years ago

Read 2 more answers

ARGENT!!!!! <br> I need help pls

Alex73 [517]

Answer:

1. -15

2. 35

3. -60

4. 5

Step-by-step explanation:

n = 16:

-5/6(2+16)

-5/6(18)

-15

n= -44:

-5/6(2-44)

-5/6(-42)

n = 70:

-5/6(2+70)

-5/6(72)

-60

n = -8:

-5/6(2-8)

-5/6(-6)

7 0

2 years ago

3 ounces of cinnamon cost $2.40. There are 16 ounces in 1 pound how much the cinnamon cost per pound

faltersainse [42]

16 ounces in a pound
2.40 for 3 ounces
16 divided by 3 = 5.333
$2.40 * 5.333 =$
12.8
Approx $12.80 for 1 pound of cinnamon

3 0

2 years ago

6. Two observers, 7220 feet apart, observe a balloonist flying overhead between them. Their measures of the

MaRussiya [10]

Answer:

The ballonist is at a height of 3579.91 ft above the ground at 3:30pm.

Step-by-step explanation:

Let's call:

h the height of the ballonist above the ground,

a the distance between the two observers,

$a_1$ the horizontal distance between the first observer and the ballonist

$a_2$ the horizontal distance between the second observer and the ballonist

$\alpha _1$ and $\alpha _2$ the angles of elevation meassured by each observer

S the area of the triangle formed with the observers and the ballonist

So, the area of a triangle is the length of its base times its height.

$S=a*h$ (equation 1)

but we can divide the triangle in two right triangles using the height line. So the total area will be equal to the addition of each individual area.

$S=S_1+S_2$ (equation 2)

$S_1=a_1*h$

But we can write $S_1$ in terms of $\alpha _1$ , like this:

$\tan(\alpha _1)=\frac{h}{a_1} \\a_1=\frac{h}{\tan(\alpha _1)} \\S_1=\frac{h^{2} }{\tan(\alpha _1)}$

And for $S_2$ will be the same:

$S_2=\frac{h^{2} }{\tan(\alpha _2)}$

Replacing in the equation 2:

$S=\frac{h^{2} }{\tan(\alpha _1)}+\frac{h^{2} }{\tan(\alpha _2)}\\S=h^{2}*(\frac{1 }{\tan(\alpha _1)}+\frac{1}{\tan(\alpha _2)})$

And replacing in the equation 1:

$h^{2}*(\frac{1 }{\tan(\alpha _1)}+\frac{1}{\tan(\alpha _2)})=a*h\\h=\frac{a}{(\frac{1 }{\tan(\alpha _1)}+\frac{1}{\tan(\alpha _2)})}$

So, we can replace all the known data in the last equation:

$h=\frac{a}{(\frac{1 }{\tan(\alpha _1)}+\frac{1}{\tan(\alpha _2)})}\\h=\frac{7220 ft}{(\frac{1 }{\tan(35.6)}+\frac{1}{\tan(58.2)})}\\h=3579,91 ft$

Then, the ballonist is at a height of 3579.91 ft above the ground at 3:30pm.

6 0

2 years ago