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Tamiku [17]
1 year ago
9

5. If there are 9 girls in a class of 40 students. What is the ratio of boys to girls?

Mathematics
2 answers:
natima [27]1 year ago
5 0

Answer:

Step-by-step explanation:

number of boys=40-9=31

boys:girls::31:9

Nataliya [291]1 year ago
4 0

Answer:

9:5

hope this helps

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Measure of xyz fast and correct please
Illusion [34]

Answer:

it will be 36 (B)

Step-by-step explanation:

1/2(72+55)=36

hope this help!

7 0
3 years ago
Two children, Ferdinand and Isabella, are playing with a water hose on a sunny summer day. Isabella is holding the hose in her h
wolverine [178]

Answer:

 f = 0.84 or 84%

Step-by-step explanation:

Given:

- Original constant velocity of water v_o = 3.5 m/s

- The original diameter of the hose opening d_o = 1.5 cm

- The total vertical distance y(f) = 1.0 m

- The total range x(f) = 10.0 m

Find:

What fraction of the original area does Isabella has to reduce or pinch so the water can cover the entire range.

Solution:

- We will assume the flow of water as a stream of particles that follow a path of single point.

- Using second kinematic equation in the vertical direction and compute the time it takes the water to reach the ground:

                                  y(t) = y(0) + v_y*t + 0.5*gt^2

Where, y(0) = v_y = 0,

                                  1.0 = 0.5*g*t^2

                                  t = sqrt ( 2*1 / 9.81 )

                                  t = 0.4515 s

- Now we will use the second equation of motion for the x- direction motion:

                                 x(t) = x(0) + v_x*t

Where, x(0) = 0,

                                 10 = 0 + v_x*(0.4515)

                                 v_x = 10 / 0.4515 = 22.1 m/s

- We have calculated the minimum velocity required to reach the range from isabella and ferdinand.

- We will use the continuity equation to compute the area required for the velocity calculated v_x = 22.1 m/s:

                                A_f*v_x = A_o*v_o

                                A_f = A_o*v_o / v_x

                                A_f = pi*0.015^2*3.5 / 4*22.1

                                A_f = 1.12 * 10^-4 m^2

- The fraction f of the reduction of area is:

                                f = (A_o - A_f) / A_o

                                f = (7.068*10^-8 - 1.12*10^-4) / (7.068*10^-8)

                               f = 0.84 or 84%

4 0
3 years ago
Use the vertex formula to find the vertex of the quadratic function f(x) = -x2 + 4x - 8.
Irina18 [472]
The vertex of f(x)=-x2+4x-8 is (2, -4)
8 0
3 years ago
I put more points, sorry
Murljashka [212]

Answer:

I dont understand. It isnt clear on what they want you to do.

3 0
3 years ago
Find the zeros and the axis of symmetry of the parabola.
emmainna [20.7K]

Answer:

ok i think its  D

Step-by-step explanation:

2,4; x= 3

i am not 100% but like i looked up examples and that seems to be the only one that looks right

6 0
3 years ago
Read 2 more answers
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