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Maksim231197 [3]
3 years ago
6

There are 15 girls and 25 boys in a science club what percent of the members were girls

Mathematics
1 answer:
otez555 [7]3 years ago
3 0
   15      /      40             =    .375
total #      total #
of girls      of students

.375 = 37.5%

15/40 as a fraction ---> simplify ---> 3/8
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If 1 - cosA= 1/2 show that tan²A + 4sin²A = 6​
pav-90 [236]

\text{Given that,}\\\\1-\cos A = \dfrac 12\implies \cos A = 1-\dfrac 12 = \dfrac 12\\\\\text{L.H.S}\\\\=\tan^2 A + 4 \sin^2 A\\\\=\dfrac{\sin^2 A}{\cos^2 A}+4(1-\cos^2 A)\\\\\\=\dfrac{1-\cos^2 A}{\cos^2 A} +4-4\cos^2 A\\\\\\=\dfrac{1-\left( \dfrac 12 \right)^2 }{\left(\dfrac 12 \right)^2 } +4 -4 \left( \dfrac 12 \right)^2\\\\\\=\dfrac{1- \dfrac 14}{\dfrac 14}+4-4\cdot  \dfrac 14\\\\\\=\dfrac{\tfrac 34}{\tfrac 14}+4-1\\\\\\=\dfrac 34 \cdot 4 +3\\\\=3+3\\\\=6\\\\=\text{R.H.S}

3 0
2 years ago
NEED HELP PLEASE as soon as possible!!!
dolphi86 [110]

Answer:

b 0.33333333333333333

8 0
3 years ago
2/3
Veronika [31]

Answer:

2/3

4

3.

An airplane is flying from New York City to Los Angeles. The distance it travels in

miles, d, is related to the time in seconds, t, by the equation d = 0.15t.

d= 0.15

1

0.157

t

(seconds)

1

30

d

(miles)

0.15

0.15 x 1

0.15 x 30

12.75

a.

How fast is it flying? Be sure to include the units.

b.

How far will it travel in 30 seconds?

C.

How long will it take to go 12.75 miles?

4.

Crater Lake in Oregon is shaped like a circle with a diamet

Step-by-step explanation:

7 0
3 years ago
To solve 5/7 - 2/n = 1/21
Usimov [2.4K]

Answer:

the answer is n=3

Step-by-step explanation:

3 0
3 years ago
I need help badly please help
TiliK225 [7]

Answer:

10. The triangles are similar.

11. The slope of the line is \displaystyle \frac{2}{3}.

12. The given equation is incorrect.

13. They have the same slope.

Step-by-step explanation:

Hi there!

---

These two triangles are similar. They share angle QPT, and angles PTQ and PSR are have the same measure as well. Because these triangles share two congruent angles, they are therefore similar.

This is the AA similarity theorem, which states that if two angles in one triangle are the same as two angles of another, the two triangles are therefore similar.

---

Points P and R both fall onto the line on the graph. The slope of a line is equal to its "rise over run", or "the number of units the line travels up" over "the number of units the line travels to the right".

Notice how, on the graph, for every 2 units the line travels up, it travels 3 units to the right.

Therefore, the slope of the line is 2 over 3, or \displaystyle \frac{2}{3}.

---

Linear equations are typically organized in slope-intercept form, which looks like this: y=mx+b where <em>m</em> is the slope and <em>b</em> is the y-intercept, or the value of y when the line crosses the y-axis.

In the given equation y=4x+\displaystyle \frac{2}{3},  the slope and the y-intercept have been switched. Therefore, this is an incorrect equation.

---

These two lines both fall onto the same line that's been graphed on the same plane. Therefore, yes, they have the same slope.

I hope this helps!

7 0
2 years ago
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