Answer:
8 students
Step-by-step explanation:
There are 20 boxes and there are a total of 40 students interviewed. So, each box is worth 2 students. Since blue has 4 boxes, 4*2 = 8 students chose blue as their favorite shoe color.
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A- 68 the time it takes for the water to rise.
B- $300 the money she gets
To find the area of the figure, we divide it into two rectangles as follows:
And we find the area of each rectangle, which is given by:

Area rectangle 1:

Area rectangle 2:

Therefore, the shaded area of the diagram is:

Answer: 54 m^2
Answer:
1 haircut = 47 dollars
1 colouring = 98 dollars
Step-by-step explanation:
Let
be equal to the cost of 1 haircut.
Let
be equal to the cost of 1 colouring treatment.
<u>1) Form equations</u>
Equation 1: 3 haircuts + 1 colour = 239 dollars
⇒ 
Equation 2: 2 haircuts + 1 colour = 192 dollars
⇒ 
<u>2) Solve the system of equations</u>
Subtract equation 2 from equation 1 to cancel out y (elimination)
-
⇒ 
Therefore, Natalie charges 47 dollars for 1 haircut.
Plug x back into one of the equations to solve for y

Subtract both sides by 94

Therefore, Natalie charges 98 dollars for 1 colouring treatment.
I hope this helps!