There are 24 boys and 16 girls in a hall, each holding coins in their hand.The mean number of coins for the children is 11, The mean number of coins for the boys is 9 Work out the mean number of coins for the girls.

Answer:

a^2 + 4a -5

Step-by-step explanation:

(a+2)^2-9

((a+2)^2) - (9)

a^2+4a+4-9

a^2 + 4a -5

Answer:

the one in parenthesis means you have to multiply the Pareinthasis first while the one wi5hout it dose not matter of in order

Answer:

12:27

Step-by-step explanation:

Answer:

B. 1/24

Step-by-step explanation:

Given: 3 inches = 6 feet

Convert 6 feet into inches.

6 feet = 72 inches

3/72. Simplying it, you get 1/24

Step-by-step explanation:

0.05*6=0.3*5000=1500

9514 1404 393

Answer:

  180 units

Step-by-step explanation:

The perimeter of ∆XYV is ...

  Pxyv = XY +YV +VX

  Pxyv = 29 +31 +40 = 100

The triangles are similar, so the scale factor from ∆XYV to ∆XZW applies to the perimeter. That scale factor is ...

  WX/VX = (32+40)/40 = 1.8

Then ...

  Pxzw = 1.8 × Pxyv = 1.8 × 100

  Pxzw = 180 . . . units

Answer:

mΔ1 = 42°

mΔ2 = 42°

Step-by-step explanation:

Δ1 + 138° = 180°

Δ1 = 180° - 138°

Δ1 = 42°

Δ2 + 138° = 180°

Δ2 = 180° - 138°

Δ2 = 42°

Answer:

0=0 or as known as infinite solution

Step-by-step explanation:

when answering a type of question there are 3 steps

1) Distribute: 3(6x+8)=24+18x

3 x 6x= 18x 3 x 8= 24

18x +24 = 24 + 18x

2) Subtract 24 from both sides of the equation:

18x + 24 = 24 + 18x

-24 -24

18x + 0 = 0 + 18x

3) Subtract 18x from both sides to set apart (x) : 18x = 18x

-18x -18x = 0 = 0

Answer:

here is da answer 4 ur quest

Answer:

Y= -2/3x-8

Step-by-step explanation:

Answer:

the tip=$36.27

new bill=$157.17

Step-by-step explanation:

Answer:

Tip amount: $36.27

Total cost: $157.17

Step-by-step explanation:

Please see attachment. Calculations are executed in black. Explanations are provided in green. Solutions are highlighted in blue.

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Hope this helps!

Answer:

70.2

Step-by-step explanation:

Answer:

11

Step-by-step explanation:

u do 4x5 which is 20

Answer:

21/8 or 2.625 or 2 5/8 m/cm^2

Step-by-step explanation:

Area of a rectangle=L×B

= 3/2×7/4

=21/8

= 2 5/8 m/cm^2

z = 2y

Step-by-step explanation:

[tex] x = 2y[/tex]..... (given)

[tex] z = x[/tex]... (exterior alternate angles)

[tex] z = 2y[/tex]

Answer:

Step-by-step explanation:

Answer:

x=45

Step-by-step explanation:

Answer:

Step-by-step explanation:

8*9   and then  [tex]10^{5-11}[/tex]

72 * [tex]10^{-6}[/tex]

No, Brianna is not correct.

The distance around the pool is 131.4 ft

The perimeter of a semicircle is the sum of half of the circumference of the circle and its diameter. As the perimeter of a circle is 2πr or πd. So, the perimeter of a semicircle is 1/2 (πd) + d or πr + 2r, where r is the radius, and, 2r=d is diameter.

P=(πr + 2r)

here, we have,

1) Semi circle with a diameter equal to the side opposite it, 20 ft.

Find the length of half the circle:

Circumference of semi-circle = (1/2)(πd)

Where:

π = 3.14

d = 20 ft.

Circumference of semi-circle = (1/2)(3.14)(20 ft) = 31.4 ft.

2) Vertical lengths from the endpoint of semi-circle to the endpoints of horizontal lengths, 40 ft each ⇒ 2 × 40 ft. = 80 ft.

3.) Horizontal length at 20 ft.

Add the semi-circle, vertical, and horizontal lengths:

Distance around the pool = 31.4 ft + 80 ft. + 20 ft.

Distance around the pool = 131.4 ft.

To learn more on perimeter of semi-circle click:

brainly.com/question/29140521

#SPJ2

Answer:

y=4-0.5x

Step-by-step explanation:

Step one:

given data

Alina bought an ice cream cone for $3

the weight of the ice cream is 4 ounce

the rate of melting is 0.5 ounce per minute

let the number of minutes taken for the ice cream to melt be x

and the weight after x minutes be y

Step two:

Hence the expression for the situation after x minutes is

y=4-0.5x

Answer: 72.45

Step-by-step explanation: Hopef this helps

Answer:

I know I shouldn't be using this, but How did you guys get the answer??? I need an explanation please!

Answer:

It is : (5%)

Step-by-step explanation:

[tex]i = prt \\ 60 = 600 \times r \times 2 \\ r = \frac{60}{1200} \\ r = 0.05 \\ r = 5\%[/tex]

I hope that is useful for you

Answer:

1 Hour and 20 minutes

Step-by-step explanation:

Time = Distance ÷ Speed

The total time taken by Andy is (1.25 + 1.5) 2.75 hrs or 165 minutes and this can be determined by using the formula of speed.

Given :

The formula of speed is used to determine the time taken by Andy to cover the total distance. The formula of speed is given by:

[tex]\rm s = \dfrac{D}{t}[/tex]

where 's' is the speed, 'D' is the distance and 't' is the time.

Now, the time taken by Andy to cover the distance of 30 Km with the speed of 24 Km/hr is:

[tex]\rm 24 = \dfrac{30}{t}[/tex]

[tex]t = \dfrac{30}{24}[/tex]

t = 1.25 hrs.

Now, the time taken by Andy to cover the distance of 12 Km with the speed of 8 Km/hr is:

[tex]\rm 8 = \dfrac{12}{t}[/tex]

[tex]t = \dfrac{12}{8}[/tex]

t = 1.5 hours.

So, the total time taken by Andy is (1.25 + 1.5) 2.75 hrs or 165 minutes.

For more information, refer to the link given below:

https://brainly.com/question/17661499

Answer:B ithink

Step-by-step explanation:

Answer:

B

Step-by-step explanation:

10(x + 8)

10x + 80

10× X and 10 × 8

Answer:

B

Step-by-step explanation:

Answer:

B. 16m - 5 - 9m

Step-by-step explanation:

The "-" outside of the parentheses also can be interpreted as -1.

So multiply -1 with 5 and 9m within the parentheses.

That gets you 16m - 5 - 9m.

Answer:

Step-by-step explanation:

6 to the 16 power

Answer:

100%-75%= 25%

Step-by-step explanation:

100%= whole class

75%=students that own a bicycle

25%=students that do not have a bicycle

Answer:

15) x = 112

18) x = 120

19) x = 31

20) x = 65

Step-by-step explanation:

I hope that is useful for you :)