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salantis [7]
3 years ago
14

In a class, 60% of the students are girls. There are 18 girls in the class.

Mathematics
2 answers:
Ne4ueva [31]3 years ago
7 0

Answer:

There are 45 students and 18 boys in the class

Katarina [22]3 years ago
5 0

Answer:

a. Total of 45 students.

b. 18 Boys.

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Find the volume of the figure.<br> 2.25 m<br> 4<br> m<br> 2.5 m<br> no
liberstina [14]

<u>Given</u>:

Given that the figure is a triangular prism.

The length of the prism is 4 m.

The base of the triangle is 2.5 m.

The height of the triangle is 2.25 m.

We need to determine the volume of the triangular prism.

<u>Volume of the triangular prism:</u>

The volume of the triangular prism can be determined using the formula,

V=\frac{1}{2}bhl

where b is the base of the triangle,

h is the height of the triangle and

l is the length of the prism.

Substituting b = 2.5, h = 2.25 and l = 4 in the above formula, we get;

V=\frac{1}{2}(2.5)(2.25)(4)

V=\frac{1}{2}(22.5)

V=11.25 \ m^3

Thus, the volume of the triangular prism is 11.25 m³

4 0
3 years ago
A Norman window has the shape of a semicircle atop a rectangle so that the diameter of the semicircle is equal to the width of t
Makovka662 [10]

Answer:

132.233 ft2

Step-by-step explanation:

Let's call the width of the rectangle 'w' and the length 'x'. So the area of the semicircle is:

A_1 = \pi*radius^2/2

A_1 = \pi*(w/2)^2/2

A_1 = \pi/8*w^2

And the area of the rectangle is:

A_2 = w*x

If the perimeter of the window is 41 feet, we have:

Perimeter = length + 2*width + \pi*radius

41 = x + 2*w + \pi*w/2

x = 41 - w(2 + \pi/2)

Now, the equation for the total area of the window is:

A = A_1 + A_2 = \pi/8*w^2 + w*x

A = \pi/8*w^2 + w*(41 - w(2 + \pi/2))

A = (\pi/8-2 - \pi/2)*w^2 + 41w = -3.1781w^2 + 41w

To find the maximum area, we can find the x-coordinate of the vertex of the quadratic equation:

x\_vertex = -b / 2a = -41 / (-3.1781*2) = 6.45

So the width that gives us the maximum area of the window is 6.45 feet, and the area will be:

A = -3.1781w^2 + 41w = -3.1781*(6.45)^2 + 41*6.45 = 132.233\ ft^2

3 0
3 years ago
PLEASE HELP (unknown answers will be deleted)
Shtirlitz [24]

Answer:

where's the assignment

8 0
3 years ago
Ann took a taxi home from the airport. The taxi fare was $2.10 and she gave the driver a tip of $5. Ann paid a total of $49.10
storchak [24]

Answer:

42 dollars

Step-by-step explanation:

3 0
2 years ago
Solve the equation 3x + 5y = 15 for y
Nana76 [90]

We are given this equation :

3x + 5y =15

We have to solve it for y, so we need to isolate y on the left side,

first we have 3x on the left side in addition, so when we take it to the right side we apply opposite operation that is subtract 3x

5y =15-3x

Next y is in multiplication with 5, so we apply opposite operation of multiplication that is division, so dividing right side by 5

y=\frac{15-3x}{5}

5 0
3 years ago
Read 2 more answers
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